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

doi:10.19799/j.cnki.2095-4239.2020.0340

Abstract

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

CLC Number:

O 646

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.

Figures/Tables 11

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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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