Polymer/colloid dual-phase electrolyte membrane for rechargeable lithium batteries |
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Authors: | Yongjian Huai Jiamin Deng Rengui Li Zhenghua Deng Jishuan Suo |
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Affiliation: | 1. China Aviation Lithium Battery Co. Ltd., Luoyang, Henan, 471009, People’s Republic of China 2. Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, Sichuan, 610041, People’s Republic of China
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Abstract: | In this work, a polymer/ceramic phase-separation porous membrane is first prepared from polyvinyl alcohol–polyacrylonitrile water emulsion mixed with fumed nano-SiO2 particles by the phase inversion method. This porous membrane is then wetted by a non-aqueous Li–salt liquid electrolyte to form the polymer/colloid dual-phase electrolyte membrane. Compared to the liquid electrolyte in conventional polyolefin separator, the obtained electrolyte membrane has superior properties in high ionic conductivity (1.9 mS?cm?1 at 30 °C), high Li+ transference number (0.41), high electrochemical stability (extended up to 5.0 V versus Li+/Li on stainless steel electrode), and good interfacial stability with lithium metal. The test cell of Li/LiCoO2 with the electrolyte membrane as separator also shows high-rate capability and excellent cycle performance. The polymer/colloid dual-phase electrolyte membrane shows promise for application in rechargeable lithium batteries. |
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