期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201702889
关键词
binders; lithium-sulfur batteries; polysulfides
类别
资金
- National Natural Science Foundation of China [51722204, 91421110, 51622208, 51402202]
- National Key Basic Research Program of China [2014CB931702]
- Fundamental Research Funds for the Central University [ZYGX2016Z004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
As one of the important ingredients in lithium-sulfur battery, the binders greatly impact the battery performance. However, conventional binders have intrinsic drawbacks such as poor capability of absorbing hydrophilic lithium polysulfides, resulting in severe capacity decay. This study reports a new type of binder by polymerization of hydrophilic poly(ethylene glycol) diglycidyl ether with polyethylenimine, which enables strongly anchoring polysulfides for high-performance lithium sulfur batteries, demonstrating remarkable improvement in both mechanical performance for standing up to 100 g weight and an excellent capacity retention of 72% over 400 cycles at 1.5 C. Importantly, in situ micro-Raman investigation verifies the effectively reduced polysulfides shuttling from sulfur cathode to lithium anode, which shows the greatly suppressed shuttle effect by the polar-functional binder. X-ray photoelectron spectroscopy analysis into the discharge intermediates upon battery cycling reveals that the hydrophilic binder endows the sulfur electrodes with multidimensional Li-O, Li-N, and S-O interactions with sulfur species to effectively mitigate lithium polysulfide dissolution, which is theoretically confirmed by density-functional theory calculations.
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