Journal
ELECTROCHIMICA ACTA
Volume 176, Issue -, Pages 1108-1115Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.07.111
Keywords
Lithium air battery; gel polymer electrolyte; cellulose acetate; poly(vinylidene fluoride-co-hexafluoropropylene); cycling stability
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Funding
- National Science Foundation of China (NSFC) [21276098, 21476088, 51302091, U1301245]
- Ministry of Science and Technology of China [2012AA053402]
- Guangdong Natural Science Foundation [S2012020011061]
- Department of Education of Guangdong Province [2013CXZDA003]
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A novel lithium-oxygen (Li-O-2) battery with a polymer gel electrolyte (PGE) membrane is successfully prepared. The membrane is a blend of cellulose acetate (CA) and poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and is fabricated using a solution casting technique followed by impregnation with lithium bis(trifluoromethane sulfonimide) (LiTFSI) solution. We demonstrate that the PGE membrane has good electrolyte uptake and shows high ionic conductivity as well as excellent thermal and electrochemical stability. A Li-O-2 battery containing our PGE as the electrolyte and separator exhibits good rate capability and enhanced cycling capacity retention compared to a battery using commercial liquid electrolyte and a polyethylene (PE) separator under the same conditions. We attribute this enhanced performance to the PGE, which maybe restrain the diffusion of oxygen from the air cathode to the Li metal anode. This study may prove valuable for resolving the problem of poor cycling stability in Li-O-2 batteries caused by oxygen diffusion from cathode to anode. (C) 2015 Elsevier Ltd. All rights reserved.
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