含硫添加剂对石墨负极低温性能的研究

doi:10.13208/j.electrochem.180322

电化学（中英文） ›› 2018, Vol. 24 ›› Issue (5): 529-537. doi: 10.13208/j.electrochem.180322

含硫添加剂对石墨负极低温性能的研究

吴则利，郑烨珍，张忠如，杨勇^*

固体表面物理化学国家重点实验室，厦门大学化学化工学院，福建厦门 361005

收稿日期:2018-03-22 修回日期:2018-04-09 出版日期:2018-10-28 发布日期:2018-04-28
通讯作者: 杨勇 E-mail:yyang@xmu.edu.cn
基金资助:
福建省科技创新领军人才项目及福建省科技重大专项（No. 2014HZ0002-1）资助

Effects of Sulfur-Containing Additive on Low Temperature Performance of Graphite Anode

WU Ze-li, ZHENG Ye-zhen, ZHANG Zhong-ru, YANG Yong^*

State Key Lab for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Received:2018-03-22 Revised:2018-04-09 Published:2018-10-28 Online:2018-04-28
Contact: YANG Yong E-mail:yyang@xmu.edu.cn

摘要/Abstract

摘要： 锂离子电池的低温性能主要取决于石墨负极，通过添加剂来改善负极的低温性能是研究的焦点之一. 本文比较了3种具有不同含硫官能团的添加剂DTD(ethylene sulfate)、1,3-PS(1,3-propane sultone)和ES(ethylene sulfite)对传统商业化材料人造石墨负极低温性能的影响. DFT（密度泛函理论）计算、扫描伏安法（CV）、扫描电子显微镜（SEM）和电化学测试结果表明，3种含硫添加剂均可在人造石墨负极表面参与成膜，并对其低温性能产生比较大的影响. 其中，DTD对石墨负极低温性能改善最为明显，1,3-PS对石墨负极的低温性能造成不利影响，而ES则没有明显作用. 电化学交流阻抗（EIS）和X射线光电子能谱（XPS）表明，这3种添加剂的不同作用主要在于其所形成的电极界面膜在电化学阻抗方面存在着明显的差异.

关键词: 锂离子电池, 人造石墨, 含硫添加剂, 低温性能

Abstract: The low temperature performance of lithium ion battery mainly depends on the graphite anode, and one of the research focuses is to improve the low temperature performance of the anode by additives. In this paper, the effects of different sulfur-containing functional groups such as DTD (ethylene sulfate), 1,3-PS (1,3-propane sultone) and ES (ethylene sulfite) on low temperature performances of artificial graphite materials were systematically studied. The results in density functional theory (DFT) calculations, cyclic voltammetry (CV), scanning electron microscopy (SEM) and charge-discharge measurement clearly demonstrated that all three sulfur-containing additives could participate in formation of films on the surface of electrode, which had a greater impact on the low temperature properties. The apparent enhancement was achieved with DTD because of the film formed with a smaller resistance. In contrast, the reduced performance was observed with 1,3-PS due to its non-conductive film formed at low temperatures, while no obvious effect with ES. The data in electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) indicated that these three kinds of additives influenced differently the low temperature performances of lithium ion battery due mainly to their significantly different impedances resulted from the films formed at the interfaces of electrodes.

Key words: lithium ion battery, artificial graphite, sulfur-containing additive, low temperature performance

中图分类号:

O646

吴则利, 郑烨珍, 张忠如, 杨勇. 含硫添加剂对石墨负极低温性能的研究[J]. 电化学（中英文）, 2018, 24(5): 529-537.

WU Ze-li, ZHENG Ye-zhen, ZHANG Zhong-ru, YANG Yong. Effects of Sulfur-Containing Additive on Low Temperature Performance of Graphite Anode[J]. Journal of Electrochemistry, 2018, 24(5): 529-537.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.180322

https://electrochem.xmu.edu.cn/CN/Y2018/V24/I5/529

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含硫添加剂对石墨负极低温性能的研究

Effects of Sulfur-Containing Additive on Low Temperature Performance of Graphite Anode

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