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28卷    第1期    总第226期    2018年1月

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文章编号:1004-0609(2018)-01-0142-08
基于电化学热耦合模型的锂离子动力电池极化特性
李书国1,艾 亮2, 3,贾 明1, 2, 3,程 昀1,杜双龙1,蒋跃辉1

(1. 中南大学 冶金与环境学院,长沙 410083; 2. 湖南艾华集团股份有限公司,益阳 413000; 3. 全固态储能材料与器件湖南省重点实验室,益阳 413000)

摘 要: 基于电化学热耦合模型,定量分析了磷酸铁锂动力电池不同倍率放电下正负极欧姆极化、浓差极化和活化极化。结果表明:1C放电初期,正极固相浓差极化波动最大,峰值达到147 mV;放电中期,各类型极化变化曲线较为平稳,活化极化最大,约为48 mV;放电末期,负极活化极化和负极固相浓差极化迅速增大;8C放电末期,正极固相浓差极化急剧增加,达到715 mV。提高放电倍率,活化极化的大幅增加是高倍率下极化严重的最主要原因,且负极活化极化的增加幅度比正极活化极化更大;而减小负极颗粒粒径可以有效减小负极活化极化。

 

关键字: 锂离子电池;欧姆极化;浓差极化;活化极化;数值仿真

Polarization characteristics of lithium ion power battery based on electrochemical-thermal model
LI Shu-guo1, AI Liang2, 3, JIA Ming1, 2, 3, CHENG Yun1, DU Shuang-long1, JIANG Yue-hui1

1. School of Metallurgy and Environment, Centre South University, Changsha 410083, China; 2. Aihua Group Co., Ltd., Yiyang 413000, China; 3. Hunan Provincial Key Laboratory of All-Solid-State Energy Storage Materials and Devices, Yiyang 413000, China

Abstract:An electrochemical-thermal model was developed to quantitative analysis ohmic polarization, concentration polarization and activation polarization of positive and negative electrodes at different discharge rates. The results show that concentration polarization of positive is the main constituent part at the beginning of 1C rate discharge, which also shows the biggest fluctuation range. Various polarizations change less in the middle of 1C rate discharge, but at the end ohmic polarization and activation polarization of negative rapidly increase. Concentration polarization of solid phase in positive electrode increases dramatically to 715mV at the end of 8C rate discharge. The aggravation of activation polarization is the main cause of large polarization with discharge rate raised, and the activation polarization of negative electrode is worse than that of positive. It is effective to remit activation polarization of negative by reducing particle sizes of negative electrode.

 

Key words: lithium ion battery; ohmic polarization; concentration polarization; activation polarization; numerical simulation

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

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

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