Direct optical fiber monitor on stress evolution of the sulfur-based cathodes for lithium–sulfur batteries

Miao Ziyun; Li Yanpeng; Xiao XiangpengSun QizhenHe BinChen XueLiao YaqiZhang YiYuan LixiaYan ZhijunLi ZhenHuang Yunhui

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Direct optical fiber monitor on stress evolution of the sulfur-based cathodes for lithium–sulfur batteries

机译：Direct optical fiber monitor on stress evolution of the sulfur-based cathodes for lithium–sulfur batteries

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Lithium-sulfur (Li-S) batteries are competitive for next-generation energy storage applications. However, soluble polysulfides cause severe shuttle effect and electrolyte abuse. Solid-solid and quasi-solid conversions are effective to address the problems, but the mechanistic understanding is still incomplete. In particular, the internal stress evolution which is tied closely to the electrode structure evolution, is rarely explored due to lack of appropriate characterization methods. Here, we report in situ monitoring of cathode stress evolution in Li-S batteries via optical fiber Bragg grating (FBG) sensors. Stress evolution in three classic mechanisms of Li-S cells including solid-liquid-solid, solid-solid and quasi-solid mechanisms has been systematically investigated. The results indicate that the differences in stress evolution are closely related to the evolution characteristics of cathode structure and volume changes. The proposed method offers a unique view for understanding the chemo-mechanics in Li-S cells, which can be extended to different electrode materials.

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《Energy & environmental science: EES》 |2022年第5期|2029-2038|共10页
作者
Miao Ziyun; Li Yanpeng; Xiao XiangpengSun QizhenHe BinChen XueLiao YaqiZhang YiYuan LixiaYan ZhijunLi ZhenHuang Yunhui;
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Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & & Mould Technol, Wuhan 430074, Peoples R China;

Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Sch Opt & Elect Informat, Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Peoples R China;

Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & & Mould Technol, Wuhan 430074, Peoples R China|Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Sch Opt & Elect Informat, Natl Engn Lab Next Generat Internet Access Syst, Wuha;

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Direct optical fiber monitor on stress evolution of the sulfur-based cathodes for lithium–sulfur batteries

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