Study on Molecular Design and Performance of Branched Polymer Electrolytes
A polymer solid-state electrolyte with densely grafted poly(ethylene oxide)(PEO)side chains on the main chain was designed.The experimental approach utilized controlled radical polymerization techniques such as atom transfer radical polymerization(ATRP)to obtain the structurally controlled branched polymers.The polymer featured methyl methacrylate(MMA)as the main chain,with side chains composed of ATRP-grafted monomers,including perfluorobutyl methacrylate(TFBMA)and poly(ethylene glycol)methyl ether methacrylate(PEGMA).The presence of fluorinated groups in TFBMA extended the electrochemical stability window of the electrolyte.Additionally,the dense branched structure of the side chains introduced steric hindrance effects,preventing entanglement between the side chains and the main chain,thereby disrupting long-range order in the polymer chains to suppress PEO crystallization and improve ionic conductivity.
branched polymersolid-electrolytelithium metal battery
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