锂离子电池的热稳定性和大电流充放电稳定性研究  

Study on Thermal and Large Charge-discharge Stability of Li-ion Batteries

作　　者：朱基亮[1] 杜翀[2] 何亮明[2] 刘静[1] 蒲云体[1] 李绪海[1] 朱建国[1] 徐明 

机构地区：[1]四川大学材料科学系,四川成都610064 [2]中国科学院上海做系统与信息技术研究所,上海200050 [3]四川师池大学固体物理研究所,四川成都610068

出　　处：《四川大学学报（工程科学版）》2011年第4期205-208,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：“973”国家重大基础研究资助项目(61310603)

摘　　要：利用电池测试系统和电化学工作站研究了DLG IRC18490柱形锂离子电池(L iCoO2/石墨C)不同温度及不同电流充电条件下的稳定性,结合阻抗分析软件Zview对得到的不同测试条件下的电化学阻抗谱进行了拟合,对锂离子电池内部电化学反应重要参数I0进行了理论计算。结果表明,当温度从室温升高到60℃时,固体电解质膜(SE I)的电阻Rse i和电荷传递电阻Rct均增大,体电阻相对稳定。在不同的荷电状态下,Rct随荷电量的增加而减小。并对I0进行了定量的计算,揭示了锂离子电池在不同充电电流和不同荷电状态下出现的不稳定性。研究结果对锂离子电池在常温下的应用具有重要指导意义。The stability of DLG IRC18490 cylindrical lithium-ion batteries（LiCoO2/C） under the conditions of different temperature and different charge currents were investigated.The electrochemical impedance spectroscopy characteristics in different conditions indicated the instability of the lithium-ion batteries.Meanwhile,I0,an important kinetic characteristic of the electron transfer process,was obtained by theoretical calculation.Analysis showed that the growing of electrolyte interface film（Rsei） and charge transfer resistance（Rct） were increased from room temperature to 60 ℃.Noticeably,Rct which was heavily depended upon the battery SoC was declined considerably with the increase of SoC.The qualitative physical explanation and quantitative theoretical calculation were given on these phenomena above.These results are of great significance to the application of lithium-ion batteries.

关 键 词：锂离子电池 电化学阻抗谱 充电 

分 类 号：O6[理学—化学]