Effect of pre-lithiation on storage life of lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2019.0253

Abstract

Abstract:

In an attempt to expand the storage life of Li-ion batteries, two soft pack Li-ion batteries with a nominal capacity of 2.0 A·h were prepared by a pre-lithiation process. For comparison, a control battery was prepared by the normal process. The effects of pre-lithiation on the rate performance, cycle performance, and storage life were evaluated. The pre-lithiation effectively reduced the self-discharge and enhanced the cycle capacity, but reduced the battery’s rate performance in an indirect way. Based on the design of the soft pack Li-ion battery, a 2.0 A·h 18650 type Li-ion battery was also prepared by pre-lithiation. When discharged at 10 C, the battery retained 99.8% of its capacity at 0.2 C, showing outstanding rate performance. After 8 months’ storage at 55 ℃, 86.6% of the primary capacity was retained. According to the storage-test fitting results, the storage life of the battery at 55 ℃ was more than 2.5 times that of commercial batteries. In addition, the capacity was not attenuated after 300 charge-discharge cycles, revealing excellent cycle performance.

Key words: pre-lithiation, storage life, self-discharge, soft pack, 18650 battery, lithium-ion battery

CLC Number:

TM 912.9

CHENG Guangyu, LIU Xinwei, GU Honghui, GAO Lei, WANG Ke. Effect of pre-lithiation on storage life of lithium-ion batteries[J]. Energy Storage Science and Technology, 2020, 9(2): 626-632.

Figures/Tables 10

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References 8

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编号	初始容量/mA·h	1个月		3个月		6个月
编号	初始容量/mA·h	保持容量/mA·h	平均保持率/%	保持容量/mA·h	平均保持率/%	保持容量/mA·h	平均保持率/%
对比1#	2071.5	2027.6	97.9	1990.1	96.3	1940.7	94.2
对比2#	2070.2	2025.9	97.9	1997.9	96.3	1959.2	94.2
贮存1#	2129.8	2127.4	100.3	2128.2	100.3	2125.9	99.4
贮存2#	2113.3	2130.1	100.3	2128.5	100.3	2090.9	99.4

电池	q=b ₀+b ₁ t ^0.5+b ₂ t
电池	b ₀	b ₁	b ₂	Reduced Chi-Sqr	Adj. R-Square
ZC18650	1.00141	-0.05633	0.00291	8.251×10^-6	0.99571
H18650	1.00944	-0.07487	-0.00691	5.667×10^-6	0.99300
25R	1.00262	-0.07931	0.00223	4.797×10^-6	0.99898

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