Low temperature performance of LiFePO4 cathode material for Li-ion batteries

Here we report the unusual low temperature (LT) capacity retention of LiFePO4, which is superior to its room temperature (RT) counterpart. In particular, the initial LT discharging capacity of LiFePO4 at −20°C was only half of the RT capacity, but its average capacity fade for the first 40 cycles wa...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-06, Vol.563, p.249-253
Main Authors: Chang, Wonyoung, Kim, Su-Jin, Park, In-Tae, Cho, Byung-Won, Chung, Kyung Yoon, Shin, Heon-Cheol
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Cathode
Cathodes
Chemistry
Cycles
Degradation
Direct energy conversion and energy accumulation
Discharge
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
Impedance
Lithium battery
Lithium-ion batteries
Low-temperature
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Summary:Here we report the unusual low temperature (LT) capacity retention of LiFePO4, which is superior to its room temperature (RT) counterpart. In particular, the initial LT discharging capacity of LiFePO4 at −20°C was only half of the RT capacity, but its average capacity fade for the first 40 cycles was only one fourth to one fifth of the RT value, which makes the capacity at −20°C exceed the RT capacity after less than 20 cycles. It is suggested from the impedance and capacity analyses that the much milder degradation of the surface and the bulk, respectively, during the LT cycling might be responsible for the stable LT operation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.02.143