锂硫电池S@pPAN正极用柔性黏结剂研究

doi:10.15541/jim20210303

无机材料学报 ›› 2022, Vol. 37 ›› Issue (2): 182-188.DOI: 10.15541/jim20210303

锂硫电池S@pPAN正极用柔性黏结剂研究

李婷婷^1,2, 张阳², 陈加航², 闵宇霖¹, 王久林^2,3

1.上海电力大学环境与化学工程学院, 上海200090;
2.上海交通大学化学化工学院, 上海200240;
3.郑州大学化学系, 郑州 450001

收稿日期:2021-05-12 修回日期:2021-08-17 出版日期:2022-02-20 网络出版日期:2021-09-27
作者简介:李婷婷(1994-), 女, 硕士研究生. E-mail: ltt190829@163.com
基金资助:
国家自然科学基金(U1705255); 上海市优秀学术带头人计划(20XD1401900); 广东省重点研发计划(2019B090908001)

Flexible Binder for S@pPAN Cathode of Lithium Sulfur Battery

LI Tingting^1,2, ZHANG Yang², CHEN Jiahang², MIN Yulin¹, WANG Jiulin^2,3

1. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
2. College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China

Received:2021-05-12 Revised:2021-08-17 Published:2022-02-20 Online:2021-09-27
Contact: WANG Jiulin, professor. E-mail: wangjiulin@sjtu.edu.cn
About author:LI Tingting(1994-), female, Master candidate. E-mail: ltt190829@163.com
Supported by:
National Natural Science Foundation of China (U1705255); Program of Shanghai Academic Research Leader (20XD1401900); Key-Area Research and Development Program of Guangdong Province (2019B090908001)

摘要/Abstract

摘要： 硫化聚丙烯腈(S@pPAN)作为锂硫电池正极材料实现了固-固转化反应机制, 没有多硫离子溶解现象, 但电化学循环过程中出现明显的体积变化, 其表界面特性对电化学性能具有重要影响。本研究以单壁碳纳米管(SWCNT)与羧甲基纤维素钠(CMC)复配作为S@pPAN正极黏结剂, 调控S@pPAN表界面并缓解充放电过程中的体积变化。在2C(1C=1672 mA∙g^-1)电流密度下, 电池循环140圈后容量保持率为84.7%, 在7C的大电流密度下仍能维持 1147 mAh∙g^-1的高比容量。加入SWCNT后复配黏结剂薄膜的极限拉伸强度提升了41倍, 并且复配黏结剂能在循环中维持更加稳定的正极界面, 有效提升了锂硫电池的循环稳定性。

关键词: 锂硫电池, S@pPAN正极, 羧甲基纤维素钠, 黏结剂, 界面稳定

Abstract: Sulfurized pyrolyzed poly(acrylonitrile) (S@pPAN) composite as cathode material of Li-S battery realizes a solid-solid conversion reaction mechanism without dissolution of polysulfides. However, its surface and interface characteristics influence the electrochemical performance significantly, and there are also obvious volume changes during electrochemical cycling. In this study, single-walled carbon nanotubes (SWCNT) and sodium carboxymethyl cellulose (CMC) were used as binder for S@pPAN cathode to regulate the surface of S@pPAN and alleviate volume changes during charging and discharging. At a current density of 2C, capacity retention rate of the batteries after 140 cycles was 84.7%, and a high specific capacity of 1147 mAh∙g^-1 can still be maintained at a high current density of 7C. The ultimate tensile strength for the film of the composite binder increases by 41 times after adding SWCNT, and the composite binder guarantees a more stable electrode interface during operation, thereby effectively improves the cycle stability of the as sembled lithium-sulfur batteries.

Key words: lithium-sulfur battery, S@pPAN cathode, sodium carboxymethyl cellulose, binder, stable interface

中图分类号:

TM911

李婷婷, 张阳, 陈加航, 闵宇霖, 王久林. 锂硫电池S@pPAN正极用柔性黏结剂研究[J]. 无机材料学报, 2022, 37(2): 182-188.

LI Tingting, ZHANG Yang, CHEN Jiahang, MIN Yulin, WANG Jiulin. Flexible Binder for S@pPAN Cathode of Lithium Sulfur Battery[J]. Journal of Inorganic Materials, 2022, 37(2): 182-188.

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锂硫电池S@pPAN正极用柔性黏结剂研究

Flexible Binder for S@pPAN Cathode of Lithium Sulfur Battery

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