磷酸铁锂电池循环初期衰减快原因分析及性能改善

doi:10.19964/j.issn.1006-4990.2022-0275

Abstract

Abstract:

LiFePO₄ battery is highly favored for its′excellent cycling performance，relatively low price and high stability.The cyclic curve faded rapidly in the early stage，and flattened out in the middle and late stages.In order to explore the potential capacity of LiFePO₄ battery for longer service life，LiFePO₄/graphite battery was taken as the research object to study the early cycle with fast decay，and suggestions for improvement were put forward based on the research results.Compared with the ternary（NCM） cell，the differences of initial efficiency of the anode material caused the cycle attenuation of LiFePO₄ material to be faster than that of the ternary material.This theory had been confirmed by means of inductively coupled plasma emission spectroscopy（ICP），X-ray diffraction（XRD），etc.The SEI films were characterized by inductively coupled plasma emission spectroscopy（ICP），energy dispersive spectroscopy（EDS） and differential scanning calorimetry（DSC）.It was proved that the main reason for the fast decay of LiFePO₄ in the early stage was the consumption of active lithium，and the loss of active lithium was mainly used to repair the damaged SEI film.Finally，the decay rate of the LiFePO₄ battery in the early stage could be slowed down by improving the OI value of the negative particles，the coating amount of the cathodes，the swelling of the negative gel，and the specific surface area of the anodes.

Key words: LiFePO₄, early stage cycle, attenuation reasons, characterization of SEI film

CLC Number:

TM912.9

XU Ruilin, ZENG Tao, LIU Huan, LIU Xingwei, WANG Hao, XU Xiaoming, ZHAO Lipeng. Cause analysis of early cycling attenuation of LiFePO₄ battery and its performance improvement[J]. Inorganic Chemicals Industry, 2023, 55(3): 92-97.

Figures/Tables 8

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循环次数	容量损失率/%
循环次数	0.05C	1C
100	3.3	3.3
200	5.0	5.0
300	6.3	6.3
400	7.4	7.4

循环次数	压力增加率/%
0~50	33.6
50~100	1.4

循环次数	极片膨胀率/%	容量衰减率/%
0~50	3.3	3.3
50~100	1.6	1.2

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Cause analysis of early cycling attenuation of LiFePO₄ battery and its performance improvement

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