PVDF-HFP Based Gel Electrolyte for Lithium-ion Battery with LiNi0.5Co0.2Mn0.3O2 Cathode
XUE Jingyuan1, HOU Bo1, MO Yan1, CAO Bokai1, CHEN Daming1, LI De1,2, CHEN Yong1,2
1 State Key Laboratory of South China Sea Marine Resource Utilisation, Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, College of Materials Science and Chemical Engineering, Hainan University, Haikou 570228; 2 Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education, Nankai University, Tianjin 300071
Abstract: Gel electrolyte for lithium ion battery was prepared via room-temperature in-situ polymerization using poly(vinylidenefluoride-co-hexafluoro-propylene) (PVDF-HFP) as polymer matrix, neopentylglycoldiacrylate (NPGDA) as crosslinking agent, 2,2′-azobis(2-methylpropionitrile) (AIBN) as initiator. The effects of the mass ratio of PVDF-HFP/NPGDA on the performances of gel electrolyte and lithium ion batteries were investigated. The results showed that the gel electrolyte with the PVDF-HFP/NPGDA mass ratio of 1∶1 had a high ionic conductivity of 8.45 mS·cm-1, a lithium ion transport number of 0.78 and an electrochemical potential window of 4.5 V, as well as a good compatibility with lithium anode. The initial discharge specific capacity was 143 mAh·g-1 at a current density of 30 mA·g-1, and the retention capacity was up to 135.3 mAh· g-1 after 50 cycles. The discharge speci-fic capacity of the battery was 100.2 mAh· g-1 at a current density of 300 mA· g-1.
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2017, Vol. 31 
