预锂化对锂离子电池贮存寿命的影响  

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

作　　者：程广玉[1] 刘新伟 顾洪汇[1] 高蕾[1] 王可[1] CHENG Guangyu;LIU Xinwei;GU Honghui;GAO Lei;WANG Ke(State Key Laboratory of Space Power Technology,Shanghai Institute of Space Power Sources,Shanghai 200245,China;Shanghai Power&Energy Storage Battery System Engineering Tech.Co.Ltd.,Shanghai 200241,China)

机构地区：[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

出　　处：《储能科学与技术》2020年第2期626-632,共7页Energy Storage Science and Technology

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。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.

关 键 词：预锂化 贮存寿命 自放电 软包 18650电池 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]