期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 16, 页码 6959-6966出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta10239a
关键词
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资金
- National Basic Research Program of China [2015CB251100]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-05CH11231]
Irreversible chemical reactions frequently cause capacity fading and poor cycle life in lithium-sulfur (Li-S) batteries due to the formation of irreversible lithium polysulfides. Recently, at the Lawrence Berkeley National Lab, an unexpected cationic polymer strategy resulted in the capture of irreversible polysulfides, which greatly enhanced the Li-S cycling performance. The branched polyethylenimine (PEI) polymer with a high density of amine groups can trap lithium polysulfides through the interaction between -NH in the amine group and soluble Li2Sx. To boost this interaction, cationization was achieved through nucleophilic substitution with CH3I, where the cationic PEI (denoted as MPEII) exhibited enhanced affinity to polysulfides. MPEII attracted not only lithium polysulfide through Li-N and Li-I attraction, but also S-x(2-) by electrostatic attraction of the positively charged N after cationization. The cell with MPEII binder exhibited better performance than that with PEI in the self-discharge test. It also achieved a high S loading of 6.5 mg cm(-2) with high areal capacity of 6.48 mA h cm(-2) and consequent areal capacity of 985 mA h g(-1) after 10 cycles.
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