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Influence of solvent type on porosity structure and properties of polymer separator for the Li-ion batteries |
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| Authors: | Zhao Fu Hongliang Feng Chanjuan Sun Xingdeng Xiang Wei Wu Jiancheng Luo Qingping Hu Anbo Feng Weishan Li |
| Affiliation: | 1. School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China 2. Shenzhen HYB Battery Limited Company, Shenzhen, 518118, China 3. Key Laboratory of Electrochemical Technology on Energy Storage and Power Generation of Guangdong Higher Education Institutes, South China Normal University, Guangzhou, 510006, China 4. Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education), South China Normal University, Guangzhou, 510006, China |
| Abstract: | Polyethylene-supported polymethyl methacrylate/poly(vinylidene fluoride-co-hexafluoropropylene) separator for gel polymer lithium-ion battery use was prepared with a mixed solvent of n-butanol and acetone. The prepared separator was characterized with scanning electron spectroscopy and X-ray diffraction, and its performance was investigated by electrochemical impedance spectroscopy and battery charge/discharge test. Compared to the separator prepared with acetone, the separator prepared with the mixed solvent shows an enhanced porosity (from 42 to 49 %) and electrolyte uptake (from 104 to 125 %). The ionic conductivity of the corresponding gel polymer electrolyte is improved from 2.81 to 3.39 mS cm?1, the discharge capacity retention of the LiCoO2/artificial graphite battery is increased from 95 to 98 % after 100 cycles at 0.5 C, and the discharge capacity of the battery at 1 C increases by 4 %. |
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