期刊
JOURNAL OF POWER SOURCES
卷 251, 期 -, 页码 417-422出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.11.090
关键词
Lithium-sulfur battery; Lithiated Nafion-coating; Polysulfide inhibition; Charge efficiency; Coated separator
Nafion-coated polypropylene separator (Celgard 2500) is used as cation-selective membrane for lithium sulfur batteries to suppress polysulfide diffusion enhancing the charge efficiency of the cells especially at low charge/discharge rates. The charge efficiency of the 10th cycle rises from about 70% to nearly 90% at a rate of C/20. The reduction of polysulfide penetration through the Nafion-coated Celgard 2500 is also proven by visual characterization. FTIR and SEM investigations verify a smooth and dense Nafion-coating on the porous polypropylene backbone of the separator. The influence of Nafion-loading on rate capability and discharge voltage is investigated by galvanostatic charge-discharge measurements. With the lowest Nafion-loading of 0.25 mg cm(-2) we are able to achieve a rate capability comparable to uncoated Celgard 2500 up to current densities of 3 mA cm(-2), whereas the functionality as polysulfide shuttle inhibitor is largely preserved. (C) 2013 Elsevier B.V. All rights reserved.
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