A phase inversion based sponge-like polysulfonamide/SiO2 composite separator for high performance lithium-ion batteries |
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Authors: | Xiao Wang Gaojie Xu Qingfu Wang Chenglong Lu Chengzhong Zong Jianjun Zhang Liping Yue Guanglei Cui |
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Affiliation: | 1.School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;2.Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China |
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Abstract: | In this work, a sponge-like polysulfonamide (PSA)/SiO2 composite membrane is unprecedentedly prepared by the phase inversion method, and successfully demonstrated as a novel separator of lithium-ion batteries (LIBs). Compared to the commercial polypropylene (PP) separator, the sponge-like PSA/SiO2 composite possesses better physical and electrochemical properties, such as higher porosity, ionic conductivity, thermal stability and flame retarding ability. The LiCoO2/Li half-cells using the sponge-like composite separator demonstrate superior rate capability and cyclability over those using the commercial PP separator. Moreover, the sponge-like composite separator can ensure the normal operation of LiCoO2/Li half-cell at an extremely high temperature of 90 °C, while the commercial PP separator cannot. All these encouraging results suggest that this phase inversion based sponge-like PSA/SiO2 composite separator is really a promising separator for high performance LIBs. |
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Keywords: | 2 Phase inversion method Separator Performance enhancement Lithium-ion battery |
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