期刊
ACS NANO
卷 16, 期 5, 页码 8449-8460出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c03059
关键词
lithium-sulfur batteries; polymer binder; molecular design; high sulfur loading; polysulfide adsorption and redox
类别
资金
- National Science Foundation of China (NSFC) [51903041, 51973035, 21991123]
- Natural Science Foundation of Shanghai [19ZR1470700]
A water dispersible and molecular interaction regulated polymer binder (PNAVS) was elaborately designed for Li-S batteries, showing coordination of LiPS with higher binding energy, optimized Li* diffusion coefficient, and ultrastable open circuit voltage for more than 3000 h. The binder engineering strategy in this work will propel the practical applications of high-performance batteries.
Polymer binders have been shown to efficiently conquer the notorious lithium polysulfide (UPS) shuttle effects in lithium-sulfur (Li-S) batteries for years, but more study is needed. Herein, a water dispersible and molecular interaction regulated polymer binder (PNAVS) for Li-S batteries was elaborately designed by co-polymerizing N-acryloyl glycinamide and 3-(1-vinyl-3-imidazolio)propanesulfonate. We demonstrate that by modulating the multiple interactions between the functional groups through copolymerization the binder was able to coordinate the LiPSs with higher binding energy for shuttle effect alleviation and cycling performance improvement. In addition, the Li* diffusion coefficient is also optimized in the PNAVS binder, which facilitates acceleration of the redox kinetics during cycling. Consequently, the PNAVS binder renders the Li-S battery with an ultrastable open circuit voltage for more than 3000 h. Even with a high sulfur loading of 11.7 mg cm(-2), the battery can still exhibit excellent areal capacity of 12.21 mA h cm(-2). As proof of concept, a pouch cell was also demonstrated with the stable cycling performance for 110 cycles. The binder engineering strategy in this work will propel the practical applications of high-performance batteries.
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