Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第4期    总第217期    2017年4月

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文章编号:1004-0609(2017)-04-0739-08
锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2的热电化学
肖忠良,周清清,宋刘斌,胡超明,卢意鹏,曹 忠

(长沙理工大学 化学与生物工程学院 电力与交通材料保护湖南省重点实验室,长沙 410004)

摘 要: 采用电化学-量热法研究以LiNi0.5Co0.2Mn0.3O2为正极材料的锂离子电池在不同环境温度和充放电倍率下的热电化学性能。结果表明:环境温度和充放电倍率是影响电池比容量的重要因素,随着充放电倍率和环境温度的增加,电池比容量逐渐减小。在低倍率(0.2C)下,电池充放电初始阶段的热流缓慢增大,且出现多个放热峰;而在较高倍率(0.5、1.0、2.0C)下,电池充放电初始阶段的热流快速增长,且充电和放电过程分别仅出现一个明显的放热峰。通过热电化学研究,可获得电池充放电过程的产热量、化学反应焓变(ΔrHm)以及化学反应熵变(ΔrSm)等热力学参数。

 

关键字: LiNi0.5Co0.2Mn0.3O2;电化学-量热法;热电化学;热力学参数;锂离子电池

Thermo-electrochemistry on LiNi0.5Co0.2Mn0.3O2 cathode material for lithium ion battery
XIAO Zhong-liang, ZHOU Qing-qing, SONG Liu-bin, HU Chao-ming, LU Yi-peng, CAO Zhong

Changsha University of Science and Technology, School of Chemistry and Biological Engineering, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha 410004, China

Abstract:The electrochemical-calorimetric method was adopted to study the thermo-electrochemistry performance of lithium ion batteries in which LiNi0.5Co0.2Mn0.3O2 acted as cathode materials at different ambient temperatures and charge-discharge rates. The results show that the discharge specific capacity decreases with increasing the charge-discharge rates and ambient temperatures. At 0.2C, the heat flow of the batteries increase slowly and appear a plurality of exothermic peaks, but at higher charge-discharge rates (0.5, 1.0 and 2.0C), the heat flow increases rapidly and only an exothermic peak appears at the charge and discharge stage, respectively. Through investigating the thermo- electrochemistry, a series of thermodynamic parameters of lithium ion batteries during charge-discharge process, such as the amount of heat, enthalpy change of chemical reaction (ΔrHm), entropy change of chemical reaction (ΔrSm), are achieved.

 

Key words: LiNi0.5Co0.2Mn0.3O2; electrochemical-calorimetric method; thermo-electrochemistry; thermodynamic parameters; lithium ion battery

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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