采用阳极预锂化技术的锂离子电池高倍率老化容量衰减机理研究

doi:10.19799/j.cnki.2095-4239.2020.0340

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (2): 454-461.doi: 10.19799/j.cnki.2095-4239.2020.0340

采用阳极预锂化技术的锂离子电池高倍率老化容量衰减机理研究

赵鹤^1,²(), 韩策¹, 程小露¹, 郝维健¹, 徐涵颖¹, 耿萌萌³, 杨凯³, 赵丰刚⁴, 邱新平¹()

^1.清华大学化学系，北京 100084
^2.中国矿业大学（北京）化学与环境工程学院，北京 100083
^3.中国电力科学研究院有限公司，北京 100085
^4.宁德时代新能源科技股份有限公司，福建宁德 352100

收稿日期:2020-10-19 修回日期:2020-11-20 出版日期:2021-03-05 发布日期:2021-03-05
作者简介:赵鹤（1993—），男，硕士研究生，研究方向为锂离子电池电极材料，E-mail：2433630990@qq.com|邱新平，教授，主要研究方向为锂离子电池，E-mail：qiuxp@mail.tsinghua.edu.cn。
基金资助:
国家重点研发计划项目(2016YFB0901700)

Research on the capacity fading mechanism of high rate aged lithium-ion batteries with anode prelithiation treatment

He ZHAO^1,²(), Ce HAN¹, Xiaolu CHENG¹, Weijian HAO¹, Hanying XU¹, Mengmeng GENG³, Kai YANG³, Fenggang ZHAO⁴, Xinping QIU¹()

^1.Department of Chemistry, Tsinghua University, Beijing 100084, China
^2.School of Chemical & Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
^3.China Electric Power Research Institute, Beijing 100085, China
^4.Contemporary Amperex Technology Co. Limited, Ningde 352100, Fujian, China

Received:2020-10-19 Revised:2020-11-20 Online:2021-03-05 Published:2021-03-05

摘要/Abstract

摘要：

通过阳极预锂化技术，可以补充锂离子电池在化成以及后续循环过程中活性锂的损失，由此提高锂离子电池的能量密度以及循环寿命。然而阳极预锂化后锂离子电池衰减机理如何变化，一直没有明确的研究结论。本文研究了经阳极预锂化的石墨-磷酸铁锂电池在高倍率老化过程中，充放电电位、电池容量、电池健康状态(SOH)、电化学阻抗等的演变过程，并研究了电池性能衰减过程中正、负极片的表面形貌、晶体结构、热稳定性变化过程。研究结果表明，在一定的补锂量范围内，阳极预锂化技术不影响电池的寿命衰减机理，而是通过克服不可逆活性锂损失来延长电池循环寿命。

关键词: 锂离子电池, 阳极预锂化, 容量衰减

Abstract:

The anode prelithiation technology can supplement the loss of active lithium in the activation process and subsequent cycling of lithium-ion batteries, so as to improve the energy density and cycling life of lithium-ion batteries. However, it is still unclear that the decay mechanism of lithium-ion batteries after anode prelithiation. In this work, we studied the evolution of charge/discharge potential, specific capacity, State of Health (SOH) and electrochemical impedance of the Graphite-LiFePO₄ battery after high rate aging conditions, the surface morphology, crystal structure and thermal stability of electrodes under fading process were also studied. The results indicate that within a certain range of filling amount of lithium, the anode prelithiation technology extends the battery cycle life by overcoming the irreversible loss of active lithium, rather affecting the battery fading mechanism.

Key words: lithium-ion battery, anode prelithiation technique, capacity fade

中图分类号:

O 646

赵鹤, 韩策, 程小露, 郝维健, 徐涵颖, 耿萌萌, 杨凯, 赵丰刚, 邱新平. 采用阳极预锂化技术的锂离子电池高倍率老化容量衰减机理研究[J]. 储能科学与技术, 2021, 10(2): 454-461.

He ZHAO, Ce HAN, Xiaolu CHENG, Weijian HAO, Hanying XU, Mengmeng GENG, Kai YANG, Fenggang ZHAO, Xinping QIU. Research on the capacity fading mechanism of high rate aged lithium-ion batteries with anode prelithiation treatment[J]. Energy Storage Science and Technology, 2021, 10(2): 454-461.

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参考文献 16

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检测源	Fe	Li
初始负极	18.94(μg/g)	1.556(μg/g)
充电负极	20.68(μg/g)	5.963(μg/g)
初始正极	31.53%	3.688%
充电正极	32.82%	0.5896%
电解液	13.86(μg/g)	—

充电态负极	C/%	O/%	F/%	P/%
PRE95	83.61	14.05	2.34	—
PRE90	48.94	48.30	2.15	0.61
PRE80	58.47	41.25	—	0.28

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采用阳极预锂化技术的锂离子电池高倍率老化容量衰减机理研究

Research on the capacity fading mechanism of high rate aged lithium-ion batteries with anode prelithiation treatment

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