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Saft--大容量高功率LiFePO4电池


Large Size Lithium Ion Cells Based on LiFePO4 Cathode Material
Bridget Deveney, Kamen Nechev, Teymur Guseynov SAFT America Inc. Richard Jow, Kang Xu Army Research Laboratory

LiFePO4 Development


Iron Phosphate is an emerging Cathode material for Li-ion.
Advantages in abuse tolerance Cost in energy density and power

Phostech is currently the only licensed supplier of the UT
technology.



In 2005 Cockeysville initiated working on LiFePO4 under a developmental program with Army research laboratory

Research provided guidance and cathode materials based on at least 2 years of


prior exploration of the technology Cockeysville based the development effort on its high power electrode design expertise

Currently Cockeysville is continuing the LiFePO4 development under MANTECH (US Army) funded effort. Two cell sizes (VLV and VLP) have been built and are in testing. As requested by the customer a module containing Very High Power cell with the LiFePO4 cathode was delivered in December 2006 and subjected to a bullet test.



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VL10Fe Cell Based On LiFePO4 Cathode



Cell optimized for Very High Power applications SAFT is using licensed supplier for the Iron Phosphate cathode material



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VL25Fe Cell Based On LiFePO4 Cathode



Cell optimized for Medium Power/Medium Energy applications SAFT is using licensed supplier for the Iron Phosphate cathode material



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LiFePO4 Development: Capacity and Energy

Total Energy Delivered Compared to a standard VL12V (NCA cathode):


75% of VL12V Energy at 12Amps

50% of the VL12V Energy at 1500Amps

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LiFePO4 Development: Power
VL10Fe 5400W/kg
SECOND MOST POWERFUL CELL AFTER SAFT VL-V CHEMISTRY

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LiFePO4 Development: Low Temperature

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LiFePO4 Development: Life



Cycling of VL10Fe

30°C- projected 4400 cycles to 80% capacity, 5700 cycles to 75% 45°C-1800 cycles to 80% capacity, 2300 cycles to 75% 60°C- 700 cycles to 80% capacity, projected 1150 cycles to 75%
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LiFePO4 Development: Life


Pulse Power retention with ageing

2500 W/kg 18sec Discharge PP @ (70-100)% SOC & 25°C 1900 W/kg 18sec Charge PP @ (20-80)% SOC & 25° C Nearly no power loss after 700 full cycles @ 1C rate & 60°C

Discharge PP

Charge PP

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LiFePO4 Development: Life



Very little loss of low temperature power after cycling at high temperature

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LiFePO4 Development: Safety
0.63 mOhm Short Circuit


2C (24A) Overcharge


No event T<100°C

Vented with no smoke & no fire T<100°C

LiFePO4 cathode: enhanced safety less lithium excess + reduced oxygen evolution less heat generation + lower energy density lower temperature rise
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LiFePO4 Development: Abuse Testing



25A/24V Overcharge



Slow Nail at 100% SOC

Smoke, No flame Max temp 310°C


Smoke, No Flame Max Temp 120°C

VL25Fe cells abuse testing: No fire with slow nail or overcharge
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LiFePO4 Development : Conclusion


Saft cells are the highest power Iron Phosphate cells available today In all this work SAFT is using material from the only licensed by UT supplier of LiFePO4 – Phostech/Süd-Chemie. Saft Iron Phosphate is suitable for power applications that require an added level of redundant safety The requirements of the application must be considered as there are tradeoffs in:
Power & energy Low temperature performance Less robust at high temperature for storage Weight and Volume









The overall requirements of the application must be taken into account to design the ideal total solution

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Acknowledgements


Saft would like to thank Gus Khalil, Henry Catherino, and Sonya Gargies at US Army TARDEC for continued support of ongoing developmental efforts under the ManTech program. Saft would also like to thank Dr. Richard Jow of ARL for his continued guidance and support and insight into new materials and performance improvements.



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