期刊
JOURNAL OF POWER SOURCES
卷 283, 期 -, 页码 524-529出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.03.085
关键词
Semi-solid lithium-sulfur battery; Laminated separator; Li+-Nafion; Polyethylene oxide; Rate capacity; Cycleability
资金
- National Natural Science Foundation of China [21476200, 21276229, 51271164]
- Science & Technology ministry of Zhejiang province [2014C31003]
A novel high-rate dischargeable semi-solid Li-S battery without free liquid electrolyte is assembled using a multi-functional separator with a polysulfide shield. The polysulfide shield is composed of Li+-Nafion, polyethylene oxide, and super P carbon. Hierarchical porous carbon is used as a sulfur holder to anchor polysulfide and improve cathode conductivity. Unlike all-solid Li-S batteries, the resultant Li-S battery shows excellent performance in both rate capacity and cycleability. The sulfur lithiation capacity reaches 1330 mAh g(-1) at 0.2 C (0.335 A g(-1) of S) and 690 mAh g(-1) (338 mAh g(-1) of electrode materials) at 10 C (16.75 A g(-1) of S). The cell with the fabricated separator (SNP/Celgard) showed very low capacity degradation rate of less than 0.1% per cycle at 1 C (a discharge current density of 1.675 A g(-1)). (C) 2015 Elsevier B.V. All rights reserved.
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