锂硫电池循环过程中变形演化的直接观测

doi:10.15541/jim20160325

无机材料学报 ›› 2017, Vol. 32 ›› Issue (3): 247-251.DOI: 10.15541/jim20160325

锂硫电池循环过程中变形演化的直接观测

王宇晖^{1, 2}, 靳俊², 郭战胜¹, 温兆银²

(1. 上海大学上海市应用数学和力学研究所, 上海 200072; 2. 中国科学院上海硅酸盐研究所, 中国科学院能量转换材料重点实验室, 上海 200050)

收稿日期:2016-05-17 修回日期:2016-08-25 出版日期:2017-03-20 网络出版日期:2017-02-24
作者简介:王宇晖(1990–), 男, 硕士研究生. E-mail: wangyuhui@student.sic.ac.cn
基金资助:
国家自然科学基金(51201177, 51372262, 11472165) National Natural Science Foundation of China (51201177, 51372262, 11472165)

Direct View for the Deformation Evolution of Sulfur Electrode during Li-S Battery Cycling

WANG Yu-Hui^{1, 2}, JIN Jun², GUO Zhan-Sheng¹, WEN Zhao-Yin²

(1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; 2. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2016-05-17 Revised:2016-08-25 Published:2017-03-20 Online:2017-02-24
About author:WANG Yu-Hui. E-mail: wangyuhui@student.sic.ac.cn

摘要/Abstract

摘要：

实验设计了一种可实时原位观测锂硫电池电极变形及电化学反应过程的实验装置。实验中观测到充放电过程中的硫电极的弯曲形变, 发现放电过程中硫正极形变增大, 曲率增大, 静置和充电过程中形变逐步还原, 曲率随之减小。同时还发现随着电化学反应的进行, 由于放电产物多硫化物的溶解, 正极附近的电解液呈黄色且不断加深。结合扫描电子显微镜(SEM)观察充放电前后的电极断面和表面的形貌, 验证硫正极在充放电过程中出现明显的形变, 从而导致电极曲率的变化。

关键词: 锂硫电池, 弯曲形变, 电极膨胀, 透明电池, 硫电极

Abstract:

An experimental set-up was developed which can observe electrode deformation and electrochemical reaction in-situ during the charge-discharge cycling of lithium-sulfur battery. The positive bending deformation during charge and discharge was monitored at real time. It was found that the positive curvature increased during discharge and reduced during open circuit. The curvature would recover the original state during charge period. As electrochemical reaction proceeds, the electrolyte near positive electrode gradually become yellow and deepened due to polysulfide dissolution of discharge products. Results of surface and section morphology observation on sulfur electrode before and after cycle using scanning electron microscope (SEM) were consistent with curvature changes during cycling and verified the volumetric expansion of sulfur electrode.

Key words: lithium-sulfur battery, bending deformation, electrode expansion, transparent battery, sulfur electrode

中图分类号:

O646

王宇晖, 靳俊, 郭战胜, 温兆银. 锂硫电池循环过程中变形演化的直接观测[J]. 无机材料学报, 2017, 32(3): 247-251.

WANG Yu-Hui, JIN Jun, GUO Zhan-Sheng, WEN Zhao-Yin. Direct View for the Deformation Evolution of Sulfur Electrode during Li-S Battery Cycling[J]. Journal of Inorganic Materials, 2017, 32(3): 247-251.

图/表 6

图 1 电池组装示意图

Fig. 1 Schematic of battery assembly (a) before and (b) after transformation

图 2 形变监测及曲率计算示意图

Fig. 2 Schematic of deformation monitoring and curvature calculation

图 3 锂硫电池第一次与第二次循环充放电曲线

Fig. 3 First and second charge-discharge curves of Li-S battery

图 4 电压、电化学反应及电极形变与充放电时间的关系曲线

Fig. 4 Relation curves between voltage, electrochemical reaction, electrode deformation, and cycle time(a) Changes in voltage and positive deformation over time under complete charge and discharge cycle; (b) Portion screenshot of electrochemical reaction and electrode deformation during cycle

图 5 电极横断面厚度变化SEM照片

Fig. 5 Cross section showing thick changing of S electrode(a) Before 1st charge-diacharge cycle; (b) After 1st charge-diacharge cycle

图6 电极表面形貌的SEM照片

Fig. 6 Surface morphologies of S electrode(a) Before 1st charge-diacharge cycle; (b) After 1st charge-diacharge cycle

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锂硫电池循环过程中变形演化的直接观测

Direct View for the Deformation Evolution of Sulfur Electrode during Li-S Battery Cycling

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