用于锂金属电池的支化聚合物电解质的分子设计及其性能研究  

Study on Molecular Design and Performance of Branched Polymer Electrolytes

作　　者：张潆心 滕翠青[1] 缪月娥 Zhang Yingxin;Teng Cuiqing;Miao Yuee(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室,上海201620

出　　处：《山东化工》2024年第18期60-63,共4页Shandong Chemical Industry

摘　　要：设计了在主链上密集接枝PEO侧链的聚合物固态电解质。实验采用原子转移自由基聚合(ATRP)等可控自由基聚合反应,得到了结构可控的支化聚合物。该聚合物以甲基丙烯酸羟乙酯(HEMA)为主链,并采用ATRP将单体甲基丙烯酸六氟丁酯(TFBMA)和聚乙二醇甲醚甲基丙烯酸酯(PEGMA)接枝到主链上。由于TFBMA中氟基团的作用使电解质具有更宽的电化学窗口。此外,支化结构致密的侧链,具有空间位阻效应可以防止侧链和主链缠绕,打破聚合物链的长程有序以抑制PEO的结晶,进而提高离子电导率。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.

关 键 词：支化聚合物 固态电解质 锂金属电池 

分 类 号：O631.3[理学—高分子化学] TK02[理学—化学]