PMMA based gel polymer electrolyte for graphite/LiNi0.8Mn0.1Co0.1O2 lithium-ion battery
CHENG Pengfei
FAN Chaojun
LIU Qiantong
FAN Weizhen
SHI Litao
Abstract：Gel polymer electrolyte(GPE)is one of the most promising electrolytes for commercial application,to mitigate or even tackle the potential safety problems such as leakage,volatilization and combustion of liquid carbonate electrolyte in lithium-ion batteries.Herein,we proposed a new type of GPE comprising methyl methacrylate as monomer,poly(ethylene glycol)dimethacrylate as crosslinking agent,lithium bis(fluorosulfonyl)imide as conductive salt,a mixture of ethylene carbonate/ethyl methyl carbonate as plasticizer,prepared by in situ solidification at elevated temperature.The thermal stability of poly(methyl methacrylate)(PMMA)-based GPE was characterized by thermogravimetric analysis(TGA).The electrhemical behavior of Al foil in the PMMA-based GPE was investigated by using chronoamperometry and scanning electron microscope(SEM).The PMMA-based GPE has a high conductivity of 6.61 mS/cm at room temperature,and exhibits much reduced volatility with 10％weight loss at 138.1 ℃ and 100.3 ℃ for the gel and liquid electrolyte,respectively.Besides,the PMMA-based GPE shows good compatibility with Al foil in the high potential region and does not corrode Al below 4.3 V vs.Li/Li+.Using the PMMA-based GPE,the graphite/LiNi0.8Mn0.1Co0.1O2 pouch cell displays stable cycling performance with 93.4％capacity retention over 1 000 cycles.
Keywords：gel polymer electrolytemethyl methacrylatelithium bis(fluorosulfonyl)imidein-situ solidification
Publication Date：2024-06-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 150-156 )