电动汽车退役动力电池中LiFePO4材料再生利用研究进展

doi:10.19964/j.issn.1006-4990.2023-0522

Abstract

Abstract:

With the goal of Carbon Peak and Carbon Neutrality proposed，new environmentally friendly energy storage devices have ushered in great development.Especially，lithium⁃ion batteries（LiB） stand out among many energy storage devices due to their high energy density and long service life.Lithium iron phosphate（LiFePO₄） material has become the mainstream of cathode materials for electric vehicle power batteries due to its advantages of good thermal stability，high cycle times，long service time，and no memory effect.With the advent of the wave of large⁃scale LiFePO₄ battery retirement，how to dispose of and utilize these spent batteries has become a hot issue that needs to be solved urgently at home and abroad.Based on the failure mechanism of LiFePO₄ batteries，the changes of spent LiFePO₄ materials before and after regeneration from both macro and micro perspectives were analyzed，and the research progress of direct recycling technology of spent LiFePO₄ materials from the dimensions of lithium compensation and construction of reducing environment was reviewed.It was clearly proposed that spent LiFePO₄ cathode materials were more suitable for direct regeneration，in order to realize the scientific recycling of spent LiFePO₄ materials.

Key words: retired LiFePO₄ battery, direct regeneration, lithium repair, construction of reducing environment

CLC Number:

TM911

XU Jing, WANG Dahui, CHEN Huaijing, GUO Yongqi, ZHENG Yang. Research progress on regeneration utilization of LiFePO₄ materials in retired power batteries of electric vehicles[J]. Inorganic Chemicals Industry, 2024, 56(8): 1-8.

Figures/Tables 8

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	元素质量分数/%			元素物质的量比
	Li	P	Fe	n（Li）/ n（P）	n（Li）/n（Fe）
C-LFP材料	4.44	18.48	33.27	1.07	1.07
R-LFP-Li₂DHBN材料	4.14	18.2	30.98	1.01	1.07
R-LFP-Li₂CO₃材料	4.41	18.11	32.36	1.08	1.09
R-LFP-LiOH材料	4.46	18.41	32.14	1.08	1.11
S-LFP材料	3.84	18.5	32.26	0.92	0.98

再生方法	S-LFP材料电化学性能	R-LFP材料电化学性能
高温固相法^［17］	0.2C时100 mA·h/g；100次循环后容量保持率达到95%	0.2C时147.3 mA·h/g；100次循环后容量保持率达到95%
水热法^［18］	0.2C时100.7 mA·h/g；100次循环后容量保持率达到76.2%	1C时135.9 mA·h/g；100次循环后容量保持率达到99%
电化学锂化法^［19］		1C时135.2 mA·h/g；500次循环后容量保持率达到95.3%
石墨预锂化法^［20］	0.5C时65.3 mA·h/g；200次循环后容量保持率达到16.8%	0.5C时126.6 mA·h/g；200次循环后容量保持率达到65.5%
隔膜预锂化法^［21］	1C时78.5 mA·h/g；292次循环后容量保持率达到18.1%	0.05C时152 mA·h/g；150次循环后容量保持率达到85.3%
低共熔溶剂^［22］	0.5C时129 mA·h/g；100次循环后容量保持率达到83%	0.5C时145 mA·h/g；100次循环后容量保持率达到90%

[1]	GE Jianhua, XIE Minyan, OUYANG Quansheng, SHAO Jiaojing. Advances in regeneration processes of cathode materials for spent power batteries [J]. Inorganic Chemicals Industry, 2024, 56(12): 79-87.
[2]	TANG Di,WANG Junxiong,CHEN Wen,JI Guanjun,MA Jun,ZHOU Guangmin. Research status and prospect on direct regeneration of cathode materials from retired lithium-ion batteries [J]. Inorganic Chemicals Industry, 2023, 55(1): 15-25.

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Inorganic Acid-Base-Salt Committee of CIESC

Research progress on regeneration utilization of LiFePO₄ materials in retired power batteries of electric vehicles

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