Difference between revisions of "Batteries"

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= Batteries Lithium-ion =
 
= Batteries Lithium-ion =
−
 
−
https://en.wikipedia.org/wiki/Comparison_of_battery_types
 
  
 
https://en.wikipedia.org/wiki/Lithium-ion_battery
 
https://en.wikipedia.org/wiki/Lithium-ion_battery
Line 21: Line 19:
  
 
''Lithium nickel cobalt aluminum oxide ('''LiNiCoAlO2''' or '''NCA''') and lithium titanate ('''Li4Ti5O12''' or '''LTO''') are specialty designs aimed at particular niche roles.''  
 
''Lithium nickel cobalt aluminum oxide ('''LiNiCoAlO2''' or '''NCA''') and lithium titanate ('''Li4Ti5O12''' or '''LTO''') are specialty designs aimed at particular niche roles.''  
−
 
−
''The new '''lithium sulphur''' batteries promise the highest performance to weight ratio.''
 
  
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
 +
 +
''While Li-aluminum (NCA) is the clear winner by storing more capacity than other systems, this only applies to specific energy.''
 +
 +
''In terms of specific power and thermal stability, Li-manganese (LMO) and Li-phosphate (LFP) are superior.''
 +
 +
''Li-titanate (LTO) may have low capacity but this chemistry outlives most other batteries in terms of life span and also has the best cold temperature performance.''
 +
 +
=== Sélection ===
  
 
{| class="wikitable"
 
{| class="wikitable"
 
|-  
 
|-  
 
! caracteristics
 
! caracteristics
−
! LMnO / LMO
+
! NMC
−
! LiNiMnCoO2 / NMC
+
 
! LiFePO4
 
! LiFePO4
−
! NCA
 
 
! LTO
 
! LTO
 
|-  
 
|-  
 
|nominal voltage [V]
 
|nominal voltage [V]
−
|3.7 (3.8)
 
 
|3.6, 3.7
 
|3.6, 3.7
 
|3.2, 3.3
 
|3.2, 3.3
−
|3.6
 
 
|2.4
 
|2.4
 
|-  
 
|-  
 
|typical operating range [V/cell]
 
|typical operating range [V/cell]
−
|3.0–4.2
 
 
|3.0–4.2 or higher
 
|3.0–4.2 or higher
 
|2.5–3.65
 
|2.5–3.65
−
|3.0–4.2
 
 
|1.8–2.85
 
|1.8–2.85
 
|-  
 
|-  
 
|Specific energy (capacity) [Wh/kg]
 
|Specific energy (capacity) [Wh/kg]
−
|100–150
 
 
|150–220
 
|150–220
 
|90–120
 
|90–120
−
|200-260; 300 predictable
 
 
|70–80
 
|70–80
 
|-  
 
|-  
 
|Charge (C-rate) typical
 
|Charge (C-rate) typical
−
|0.7–1 C, 3 C maximum
 
 
|0.7–1 C; Charge current above 1C shortens battery life.
 
|0.7–1 C; Charge current above 1C shortens battery life.
 
|1 C
 
|1 C
−
|0.7 C
 
 
|1 C; 5C maximum
 
|1 C; 5C maximum
 
|-  
 
|-  
−
|charges to
+
|charges to [V]
−
|4.20 V (most cells)
+
|4.2, some go to 4.3
−
|4.20 V, some go to 4.30 V
+
|3.65
−
|3.65 V
+
|2.85
−
|4.20 V (most cells)
+
−
|2.85 V
+
 
|-  
 
|-  
−
|Charge time, typical
+
|Charge time [h], typical
−
|
+
|3
−
|3h
+
|3
−
|3h
+
−
|3h, fast charge possible with some cells
+
 
|
 
|
 
|-  
 
|-  
 
|Discharge (C-rate)
 
|Discharge (C-rate)
−
|1C; 10C possible with some cells, 30C pulse (5s)
+
|1 C; 2 C possible on some cells
−
|1C; 2C possible on some cells
+
|1 C, 25 C on some cells; 40 A pulse (2 s)
−
|1C, 25C on some cells; 40A pulse (2s)
+
|10 C possible, 30 C 5 s pulse
−
|1C typical; high discharge rate shortens battery life
+
−
|10C possible, 30C 5s pulse
+
 
|-  
 
|-  
−
|Discharge cut-off
+
|Discharge cut-off voltage [V]
−
|2.50V
+
|2.5
−
|2.50V
+
|2.5 (lower that 2 V causes damage)
−
|2.50V (lower that 2V causes damage)
+
|1.8
−
|3.00V
+
−
|1.80V
+
 
|-
 
|-
 
|Cycle life (related to depth of discharge, temperature)
 
|Cycle life (related to depth of discharge, temperature)
−
|300–700
 
 
|1000–2000
 
|1000–2000
 
|1000–2000
 
|1000–2000
−
|500
 
 
|3000–7000
 
|3000–7000
 
|-  
 
|-  
 
|Thermal runaway temperature [°C], typical
 
|Thermal runaway temperature [°C], typical
−
|250
 
 
|210
 
|210
 
|270
 
|270
−
|150
 
 
|
 
|
 
|-  
 
|-  
 
|Thermal runaway, others
 
|Thermal runaway, others
−
|High charge promotes thermal runaway
 
 
|High charge promotes thermal runaway
 
|High charge promotes thermal runaway
 
|Very safe battery even if fully charged
 
|Very safe battery even if fully charged
−
|High charge promotes thermal runaway
 
 
|One of safest Li-ion batteries
 
|One of safest Li-ion batteries
 
|-  
 
|-  
 
|Applications
 
|Applications
−
|Power tools, medical devices, electric powertrains
 
 
|E-bikes, medical devices, EVs, industrial
 
|E-bikes, medical devices, EVs, industrial
 
|Portable and stationary needing high load currents and endurance
 
|Portable and stationary needing high load currents and endurance
−
|Medical devices, industrial, electric powertrain (Tesla)
 
 
|UPS, electric powertrain (Mitsubishi i-MiEV, Honda Fit EV), solar-powered street lighting
 
|UPS, electric powertrain (Mitsubishi i-MiEV, Honda Fit EV), solar-powered street lighting
 
|-  
 
|-  
 
|Comments
 
|Comments
−
|High power but less capacity; safer than Li-cobalt; commonly mixed with NMC to improve performance.
 
 
|Provides high capacity and high power. Serves as Hybrid Cell. Favorite chemistry for many uses; market share is increasing.
 
|Provides high capacity and high power. Serves as Hybrid Cell. Favorite chemistry for many uses; market share is increasing.
 
|Very flat voltage discharge curve but low capacity. One of safest Li-ions. Used for special markets. Elevated self-discharge.
 
|Very flat voltage discharge curve but low capacity. One of safest Li-ions. Used for special markets. Elevated self-discharge.
−
|Shares similarities with Li-cobalt. Serves as Energy Cell.
 
 
|Long life, fast charge, wide temperature range but low specific energy and expensive. Among safest Li-ion batteries.
 
|Long life, fast charge, wide temperature range but low specific energy and expensive. Among safest Li-ion batteries.
 
|}
 
|}
  
−
''While Li-aluminum (NCA) is the clear winner by storing more capacity than other systems, this only applies to specific energy. In terms of specific power and thermal stability, Li-manganese (LMO) and Li-phosphate (LFP) are superior. Li-titanate (LTO) may have low capacity but this chemistry outlives most other batteries in terms of life span and also has the best cold temperature performance. Moving towards the electric powertrain, safety and cycle life will gain dominance over capacity. (LCO stands for Li-cobalt, the original Li-ion.)''
+
=== de côté ===
 +
LMO et NCA, mis en commentaire <!--
 +
{| class="wikitable"
 +
|-
 +
! caracteristics
 +
! LMO
 +
! NCA
 +
|-
 +
|nominal voltage [V]
 +
|3.7 (3.8)
 +
|3.6
 +
|-
 +
|typical operating range [V/cell]
 +
|3.0–4.2
 +
|3.0–4.2
 +
|-
 +
|Specific energy (capacity) [Wh/kg]
 +
|100–150
 +
|200-260; 300 predictable
 +
|-
 +
|Charge (C-rate) typical
 +
|0.7–1 C, 3 C maximum
 +
|0.7 C
 +
|-
 +
|charges to [V]
 +
|4.2 (most cells)
 +
|4.2 (most cells)
 +
|-
 +
|Charge time [h], typical
 +
|
 +
|3; fast charge possible with some cells
 +
|-  
 +
|Discharge (C-rate)
 +
|1 C; 10 C possible with some cells, 30 C pulse (5 s)
 +
|1 C typical; high discharge rate shortens battery life
 +
|-
 +
|Discharge cut-off voltage [V]
 +
|2.5
 +
|3.0
 +
|-
 +
|Cycle life (related to depth of discharge, temperature)
 +
|300–700
 +
|500
 +
|-
 +
|Thermal runaway temperature [°C], typical
 +
|250
 +
|150
 +
|-
 +
|Thermal runaway, others
 +
|High charge promotes thermal runaway
 +
|High charge promotes thermal runaway
 +
|-
 +
|Applications
 +
|Power tools, medical devices, electric powertrains
 +
|Medical devices, industrial, electric powertrain (Tesla)
 +
|-
 +
|Comments
 +
|High power but less capacity; safer than Li-cobalt; commonly mixed with NMC to improve performance.
 +
|Shares similarities with Li-cobalt. Serves as Energy Cell.
 +
|}
 +
-->
  
 
== [https://en.wikipedia.org/wiki/Lithium-ion_battery#Shapes Formes] ==
 
== [https://en.wikipedia.org/wiki/Lithium-ion_battery#Shapes Formes] ==
Line 150: Line 186:
 
''high current rating and long cycle life, besides good thermal stability, enhanced safety and tolerance if abused.''
 
''high current rating and long cycle life, besides good thermal stability, enhanced safety and tolerance if abused.''
  
−
''Li-phosphate is more tolerant to full charge conditions and is less stressed than other lithium-ion systems if kept at high voltage for a prolonged time. As a trade-off, the lower voltage of 3.2V/cell reduces the specific energy to less than that of Li-manganese. With most batteries, cold temperature reduces performance and elevated storage temperature shortens the service life, and Li-phosphate is no exception. Li-phosphate has a higher self-discharge than other Li-ion batteries, which can cause balancing issues with aging.''
+
''LiFePO4 is more tolerant to full charge conditions and is less stressed than other lithium-ion systems if kept at high voltage for a prolonged time. As a trade-off, the lower voltage of 3.2 V/cell reduces the specific energy to less than that of LMO. With most batteries, cold temperature reduces performance and elevated storage temperature shortens the service life, and LiFePO4 is no exception. LiFePO4 has a higher self-discharge than other Li-ion batteries, which can cause balancing issues with aging.''
  
−
''Four cells in series produce 12.80V, a similar voltage to six 2V lead acid cells in series. Vehicles charge lead acid to 14.40V (2.40V/cell) and maintain a topping charge. With four Li-phosphate cells in series, each cell tops at 3.60V, which is the correct full-charge voltage. At this point, the charge should be disconnected but the topping charge continues while driving. Li-phosphate is tolerant to some overcharge; however, keeping the voltage at 14.40V for a prolonged time, as most vehicles do on a long drive, could stress Li-phosphate. Cold temperature operation starting could also be an issue with Li-phosphate as a starter battery.''
+
''Four cells in series produce 12.8 V, a similar voltage to six 2 V lead acid cells in series. Vehicles charge lead acid to 14.4 V (2.4 V/cell) and maintain a topping charge. With four LiFePO4 cells in series, each cell tops at 3.6 V, which is the correct full-charge voltage. At this point, the charge should be disconnected but the topping charge continues while driving. LiFePO4 is tolerant to some overcharge; however, keeping the voltage at 14.4 V for a prolonged time, as most vehicles do on a long drive, could stress LiFePO4. Cold temperature operation starting could also be an issue with LiFePO4 as a starter battery.''
  
−
''Li-phosphate has excellent safety and long life span but moderate specific energy and elevated self-discharge.''
+
''LiFePO4 has excellent safety and long life span but moderate specific energy and elevated self-discharge.''
  
−
== [https://en.wikipedia.org/wiki/Lithium_ion_manganese_oxide_battery LMnO / LMO] ==
+
== LiNiMnCoO2 / NMC ==
  
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
  
−
''high thermal stability and enhanced safety, but the cycle and calendar life are limited.''
+
''Similar to LMO, these systems can be tailored to serve as Energy Cells or Power Cells. For example, NMC in an 18650 cell for moderate load condition has a capacity of about 2800 mAh and can deliver 4 A to 5 A; NMC in the same cell optimized for specific power has a capacity of only about 2000 mWh but delivers a continuous discharge current of 20 A. A silicon-based anode will go to 4000 mAh and higher but at reduced loading capability and shorter cycle life. Silicon added to graphite has the drawback that the anode grows and shrinks with charge and discharge, making the cell mechanically unstable.''
  
−
''Low internal cell resistance enables fast charging and high-current discharging. In an 18650 package, Li-manganese can be discharged at currents of 20–30A with moderate heat buildup. It is also possible to apply one-second load pulses of up to 50A. A continuous high load at this current would cause heat buildup and the cell temperature cannot exceed 80°C. Li-manganese is used for power tools, medical instruments, as well as hybrid and electric vehicles.''
+
''NMC is the battery of choice for power tools, e-bikes and other electric powertrains. The cathode combination is typically one-third nickel, one-third manganese and one-third cobalt, also known as 1-1-1. This offers a unique blend that also lowers the raw material cost due to reduced cobalt content. Another successful combination is NMC with 5 parts nickel, 3 parts cobalt and 2 parts manganese. Further combinations using various amounts of cathode materials are possible. New electrolytes and additives enable charging to 4.4 V/cell and higher to boost capacity''
  
−
''Design flexibility allows engineers to maximize the battery for either optimal longevity (life span), maximum load current (specific power) or high capacity (specific energy). For example, the long-life version in the 18650 cell has a moderate capacity of only 1,100mAh; the high-capacity version is 1,500mAh.''
+
''NMC has good overall performance and excels on specific energy. This battery is the preferred candidate for the electric vehicle and has the lowest self-heating rate.''
  
−
''Most Li-manganese batteries blend with lithium nickel manganese cobalt oxide (NMC) to improve the specific energy and prolong the life span. This combination brings out the best in each system, and the LMO (NMC) is chosen for most electric vehicles, such as the Nissan Leaf, Chevy Volt and BMW i3. The LMO part of the battery, which can be about 30 percent, provides high current boost on acceleration; the NMC part gives the long driving range.''
+
''There is a move towards NMC-blended Li-ion as the system can be built economically and it achieves a good performance. The three active materials of nickel, manganese and cobalt can easily be blended to suit a wide range of applications for automotive and energy storage systems (EES) that need frequent cycling. The NMC family is growing in its diversity.''
  
−
== LiNiMnCoO2 / NMC ==
+
== [https://en.wikipedia.org/wiki/Lithium%E2%80%93titanate_battery Li4Ti5O12 / LTO]==
  
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
  
−
''Similar to Li-manganese, these systems can be tailored to serve as Energy Cells or Power Cells. For example, NMC in an 18650 cell for moderate load condition has a capacity of about 2,800mAh and can deliver 4A to 5A; NMC in the same cell optimized for specific power has a capacity of only about 2,000mWh but delivers a continuous discharge current of 20A. A silicon-based anode will go to 4,000mAh and higher but at reduced loading capability and shorter cycle life. Silicon added to graphite has the drawback that the anode grows and shrinks with charge and discharge, making the cell mechanically unstable.''
+
''LTO has a nominal cell voltage of 2.4 V, can be fast charged and delivers a high discharge current of 10 C, or 10 times the rated capacity. The cycle count is said to be higher than that of a regular Li-ion. LTO is safe, has excellent low-temperature discharge characteristics and obtains a capacity of 80% at –30°C. However, the battery is expensive and at 65 Wh/kg the specific energy is low, rivalling that of NiCd. LTO charges to 2.8 V/cell, and the end of discharge is 1.8 V/cell.''
  
−
''NMC is the battery of choice for power tools, e-bikes and other electric powertrains. The cathode combination is typically one-third nickel, one-third manganese and one-third cobalt, also known as 1-1-1. This offers a unique blend that also lowers the raw material cost due to reduced cobalt content. Another successful combination is NCM with 5 parts nickel, 3 parts cobalt and 2 parts manganese. Further combinations using various amounts of cathode materials are possible. New electrolytes and additives enable charging to 4.4V/cell and higher to boost capacity''
+
''Typical uses are electric powertrains, UPS and solar-powered street lighting.''
  
−
''NMC has good overall performance and excels on specific energy. This battery is the preferred candidate for the electric vehicle and has the lowest self-heating rate.''
+
''LTO excels in safety, low-temperature performance and life span. Efforts are being made to improve the specific energy and lower cost.''
−
 
+
−
''There is a move towards NMC-blended Li-ion as the system can be built economically and it achieves a good performance. The three active materials of nickel, manganese and cobalt can easily be blended to suit a wide range of applications for automotive and energy storage systems (EES) that need frequent cycling. The NMC family is growing in its diversity.''
+
  
−
== NCA ==
+
== de côté ==
 +
LMO et NCA, mis en commentaire <!--
 +
=== NCA ===
  
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
Line 188: Line 224:
 
''High energy and power densities, as well as good life span, make NCA a candidate for EV powertrains. High cost and marginal safety are negatives.''
 
''High energy and power densities, as well as good life span, make NCA a candidate for EV powertrains. High cost and marginal safety are negatives.''
  
−
== [https://en.wikipedia.org/wiki/Lithium%E2%80%93titanate_battery Li4Ti5O12 / LTO]==
+
=== [https://en.wikipedia.org/wiki/Lithium_ion_manganese_oxide_battery LMnO / LMO] ===
  
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
 
http://batteryuniversity.com/learn/article/types_of_lithium_ion
  
−
''Li-titanate has a nominal cell voltage of 2.40V, can be fast charged and delivers a high discharge current of 10C, or 10 times the rated capacity. The cycle count is said to be higher than that of a regular Li-ion. Li-titanate is safe, has excellent low-temperature discharge characteristics and obtains a capacity of 80 percent at –30°C (–22°F). However, the battery is expensive and at 65Wh/kg the specific energy is low, rivalling that of NiCd. Li-titanate charges to 2.80V/cell, and the end of discharge is 1.80V/cell.''
+
''high thermal stability and enhanced safety, but the cycle and calendar life are limited.''
  
−
''Typical uses are electric powertrains, UPS and solar-powered street lighting.''
+
''Low internal cell resistance enables fast charging and high-current discharging. In an 18650 package, LMO can be discharged at currents of 20–30 A with moderate heat buildup. It is also possible to apply one-second load pulses of up to 50 A. A continuous high load at this current would cause heat buildup and the cell temperature cannot exceed 80°C. LMO is used for power tools, medical instruments, as well as hybrid and electric vehicles.''
  
−
''Li-titanate excels in safety, low-temperature performance and life span. Efforts are being made to improve the specific energy and lower cost.''
+
''Design flexibility allows engineers to maximize the battery for either optimal longevity (life span), maximum load current (specific power) or high capacity (specific energy). For example, the long-life version in the 18650 cell has a moderate capacity of only 1100 mAh; the high-capacity version is 1500 mAh.''
  
−
== [https://en.wikipedia.org/wiki/Lithium%E2%80%93sulfur_battery Sulphure de lithium] ==
+
''Most LMO batteries blend with NMC to improve the specific energy and prolong the life span. This combination brings out the best in each system, and the LMO-NMC is chosen for most electric vehicles, such as the Nissan Leaf, Chevy Volt and BMW i3. The LMO part of the battery, which can be about 30 percent, provides high current boost on acceleration; the NMC part gives the long driving range.''
−
 
+
-->
−
http://batteryuniversity.com/learn/article/types_of_lithium_ion
+
  
 
= Modèles de location =
 
= Modèles de location =
Line 207: Line 242:
  
 
= Ressources =
 
= Ressources =
 +
 +
http://batteryuniversity.com/learn/
  
 
https://en.wikipedia.org/wiki/Rechargeable_battery
 
https://en.wikipedia.org/wiki/Rechargeable_battery

Latest revision as of 17:40, 20 April 2016

Objectif

  • obtenir des batteries au prix le plus bas possible, impliquant probablement un assemblage maison de cellules
  • acquérir des connaissances dans le domaine des batteries, faire les choses selon les normes en vigueur, ne pas compromettre la sécurité

Applications

Batteries Lithium-ion

https://en.wikipedia.org/wiki/Lithium-ion_battery

Handheld electronics mostly use LIBs based on lithium cobalt oxide (LiCoO2), which offers high energy density, but presents safety risks, especially when damaged.

Lithium iron phosphate (LiFePO4), Lithium ion manganese oxide battery (LMnO or LMO) and lithium nickel manganese cobalt oxide (LiNiMnCoO2 or NMC) offer lower energy density, but longer lives and inherent safety. Such batteries are widely used for electric tools, medical equipment and other roles. NMC in particular is a leading contender for automotive applications.

Lithium nickel cobalt aluminum oxide (LiNiCoAlO2 or NCA) and lithium titanate (Li4Ti5O12 or LTO) are specialty designs aimed at particular niche roles.

http://batteryuniversity.com/learn/article/types_of_lithium_ion

While Li-aluminum (NCA) is the clear winner by storing more capacity than other systems, this only applies to specific energy.

In terms of specific power and thermal stability, Li-manganese (LMO) and Li-phosphate (LFP) are superior.

Li-titanate (LTO) may have low capacity but this chemistry outlives most other batteries in terms of life span and also has the best cold temperature performance.

Sélection

caracteristics NMC LiFePO4 LTO
nominal voltage [V] 3.6, 3.7 3.2, 3.3 2.4
typical operating range [V/cell] 3.0–4.2 or higher 2.5–3.65 1.8–2.85
Specific energy (capacity) [Wh/kg] 150–220 90–120 70–80
Charge (C-rate) typical 0.7–1 C; Charge current above 1C shortens battery life. 1 C 1 C; 5C maximum
charges to [V] 4.2, some go to 4.3 3.65 2.85
Charge time [h], typical 3 3
Discharge (C-rate) 1 C; 2 C possible on some cells 1 C, 25 C on some cells; 40 A pulse (2 s) 10 C possible, 30 C 5 s pulse
Discharge cut-off voltage [V] 2.5 2.5 (lower that 2 V causes damage) 1.8
Cycle life (related to depth of discharge, temperature) 1000–2000 1000–2000 3000–7000
Thermal runaway temperature [°C], typical 210 270
Thermal runaway, others High charge promotes thermal runaway Very safe battery even if fully charged One of safest Li-ion batteries
Applications E-bikes, medical devices, EVs, industrial Portable and stationary needing high load currents and endurance UPS, electric powertrain (Mitsubishi i-MiEV, Honda Fit EV), solar-powered street lighting
Comments Provides high capacity and high power. Serves as Hybrid Cell. Favorite chemistry for many uses; market share is increasing. Very flat voltage discharge curve but low capacity. One of safest Li-ions. Used for special markets. Elevated self-discharge. Long life, fast charge, wide temperature range but low specific energy and expensive. Among safest Li-ion batteries.

de côté

LMO et NCA, mis en commentaire

Formes

Li-ion cells (as distinct from entire batteries) are available in various shapes, which can generally be divided into four groups:

  1. Small cylindrical (solid body without terminals, such as those used in laptop batteries)
  2. Large cylindrical (solid body with large threaded terminals)
  3. Pouch (soft, flat body, such as those used in cell phones)
  4. Prismatic (semi-hard plastic case with large threaded terminals, such as vehicles' traction packs)

https://en.wikipedia.org/wiki/Lithium_polymer_battery

A lithium polymer battery, or more correctly lithium-ion polymer battery (abbreviated variously as LiPo, LIP, Li-poly and others), is a rechargeable battery of lithium-ion technology in a pouch format. Unlike cylindrical and prismatic cells, LiPos come in a soft package or pouch, which makes them lighter but also less rigid.

[...] "polymer" refers more to a "polymer casing" (that is, the soft, external container) rather than a "polymer electrolyte". While the design is usually flat, and lightweight, it is not truly a polymer cell, since the electrolyte is still in liquid form, although it may be "plasticized" or "gelled" through a polymer additive.

LiFePO4

http://batteryuniversity.com/learn/article/types_of_lithium_ion

high current rating and long cycle life, besides good thermal stability, enhanced safety and tolerance if abused.

LiFePO4 is more tolerant to full charge conditions and is less stressed than other lithium-ion systems if kept at high voltage for a prolonged time. As a trade-off, the lower voltage of 3.2 V/cell reduces the specific energy to less than that of LMO. With most batteries, cold temperature reduces performance and elevated storage temperature shortens the service life, and LiFePO4 is no exception. LiFePO4 has a higher self-discharge than other Li-ion batteries, which can cause balancing issues with aging.

Four cells in series produce 12.8 V, a similar voltage to six 2 V lead acid cells in series. Vehicles charge lead acid to 14.4 V (2.4 V/cell) and maintain a topping charge. With four LiFePO4 cells in series, each cell tops at 3.6 V, which is the correct full-charge voltage. At this point, the charge should be disconnected but the topping charge continues while driving. LiFePO4 is tolerant to some overcharge; however, keeping the voltage at 14.4 V for a prolonged time, as most vehicles do on a long drive, could stress LiFePO4. Cold temperature operation starting could also be an issue with LiFePO4 as a starter battery.

LiFePO4 has excellent safety and long life span but moderate specific energy and elevated self-discharge.

LiNiMnCoO2 / NMC

http://batteryuniversity.com/learn/article/types_of_lithium_ion

Similar to LMO, these systems can be tailored to serve as Energy Cells or Power Cells. For example, NMC in an 18650 cell for moderate load condition has a capacity of about 2800 mAh and can deliver 4 A to 5 A; NMC in the same cell optimized for specific power has a capacity of only about 2000 mWh but delivers a continuous discharge current of 20 A. A silicon-based anode will go to 4000 mAh and higher but at reduced loading capability and shorter cycle life. Silicon added to graphite has the drawback that the anode grows and shrinks with charge and discharge, making the cell mechanically unstable.

NMC is the battery of choice for power tools, e-bikes and other electric powertrains. The cathode combination is typically one-third nickel, one-third manganese and one-third cobalt, also known as 1-1-1. This offers a unique blend that also lowers the raw material cost due to reduced cobalt content. Another successful combination is NMC with 5 parts nickel, 3 parts cobalt and 2 parts manganese. Further combinations using various amounts of cathode materials are possible. New electrolytes and additives enable charging to 4.4 V/cell and higher to boost capacity

NMC has good overall performance and excels on specific energy. This battery is the preferred candidate for the electric vehicle and has the lowest self-heating rate.

There is a move towards NMC-blended Li-ion as the system can be built economically and it achieves a good performance. The three active materials of nickel, manganese and cobalt can easily be blended to suit a wide range of applications for automotive and energy storage systems (EES) that need frequent cycling. The NMC family is growing in its diversity.

Li4Ti5O12 / LTO

http://batteryuniversity.com/learn/article/types_of_lithium_ion

LTO has a nominal cell voltage of 2.4 V, can be fast charged and delivers a high discharge current of 10 C, or 10 times the rated capacity. The cycle count is said to be higher than that of a regular Li-ion. LTO is safe, has excellent low-temperature discharge characteristics and obtains a capacity of 80% at –30°C. However, the battery is expensive and at 65 Wh/kg the specific energy is low, rivalling that of NiCd. LTO charges to 2.8 V/cell, and the end of discharge is 1.8 V/cell.

Typical uses are electric powertrains, UPS and solar-powered street lighting.

LTO excels in safety, low-temperature performance and life span. Efforts are being made to improve the specific energy and lower cost.

de côté

LMO et NCA, mis en commentaire

Modèles de location

Puisque c'est un modèle commercial qui est pratiqué (en particulier s'agissant de certains véhicules électriques), il vaudrait la peine de le décrire/comprendre afin d'en tenir compte et de ne pas passer à côté de solutions économiquement intéressantes.

Ressources

http://batteryuniversity.com/learn/

https://en.wikipedia.org/wiki/Rechargeable_battery

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