储能科学与技术 ›› 2020, Vol. 9 ›› Issue (2): 626-632.doi: 10.19799/j.cnki.2095-4239.2019.0253

• 储能材料与器件 • 上一篇    下一篇

预锂化对锂离子电池贮存寿命的影响

程广玉1(), 刘新伟2, 顾洪汇1, 高蕾1, 王可1   

  1. 1. 空间电源技术国家重点实验室，上海空间电源研究所，上海 200245
    2. 上海动力储能电池系统工程技术有限公司，上海 200241
  • 收稿日期:2019-11-06 修回日期:2019-11-15 出版日期:2020-03-05 发布日期:2019-12-19
  • 作者简介:联系人：程广玉（1987—），男，硕士，工程师，研究方向为锂离子电池，E-mail：chengguangyu12@126.com。

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

CHENG Guangyu1(), LIU Xinwei2, GU Honghui1, GAO Lei1, WANG Ke1   

  1. 1. State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources, Shanghai 200245, China
    2. Shanghai Power & Energy Storage Battery System Engineering Tech. Co. Ltd. , Shanghai 200241, China
  • Received:2019-11-06 Revised:2019-11-15 Online:2020-03-05 Published:2019-12-19

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摘要：

为了研究拓展锂离子电池贮存寿命的方法，本工作研制了两款额定容量为2.0 A·h的软包锂离子电池，分别为采用了预锂化工艺的贮存电池和常规设计的对比电池。对比了预锂化对电池倍率性能、循环性能及贮存寿命等的影响。结果表明，预锂化可以有效降低电池自放电、提升循环容量，但会间接降低电池的倍率性能。在软包电池的设计基础上进行了18650电池的研制，同样采用预锂化处理工艺，该电池额定容量2.0 A·h、10 C放电容量达到0.2 C容量的99.8%，表现出卓越的倍率性能。55 ℃搁置8个月容量保持率86.6%，搁置数据拟合结果表明，其在该温度下贮存寿命是市售同类电池的2.5倍以上。另外，该电池循环300次容量无衰减，表现出优异的循环性能。

关键词: 预锂化, 贮存寿命, 自放电, 软包, 18650电池, 锂离子电池

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

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