DOPO-KH560改性聚氧化乙烯聚合物固态电解质的制备及性能  

Preparation and Properties of DOPO-KH560 Modified Polyethylene Oxide Polymer Solid State Electrolytes

作　　者：鲁进 贾路 刘新刚[1] 张楚虹[1] Jin Lu;Lu Jia;Xingang Liu;Chuhong Zhang(Polymer Research Insiituie,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2021年第3期135-142,150,共9页Polymer Materials Science & Engineering

基　　金：成都市产业集群协同创新项目(2017-XT00-00001-GX);四川大学专职博后基金(2020SCU12007)。

摘　　要：利用9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)改性3-缩水甘油氧基-丙基三甲氧基硅烷(KH560)合成了阻燃效果优异的硅/磷协效阻燃剂,并与聚氧化乙烯(PEO)、锂盐复合制备聚合物固态电解质,研究其对PEO基电解质的热稳定性和电化学性能的影响。通过对聚合物固态电解质的组成、热稳定性和电化学性能研究表明,当DOPO-KH560质量分数为10%,n(EO)∶n(Li^(+))=8∶1时,DOPO-KH560/PEO/LiTFSI电解质的室温电导率高达1.8×10^(-4) S/cm,在4.9 V以下能够保持电化学稳定;以该电解质制备的LiFePO_(4)/Li半电池可以在80℃下稳定使用,在0.2 C电流密度、循环80次后可逆比容量为136.5 mA·h/g,具有优异的循环稳定性。An excellent silicon/phosphorus double-effect flame retardant,prepared by modifying 3-glycidoxy-propyltrimethoxysilane(KH560)with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO),was compounded with polyethylene oxide(PEO)and lithium salts to prepare polymer solid electrolytes,and its influence on the thermal stability and electrochemical performance of PEO based electrolytes was studied.It is found that the conductivity of the DOPO-KH560/PEO/LiTFSI electrolyte is as high as 1.8×10^(-4) S/cm when the addition amount of DOPO-KH560 is 10%and n(EO)∶n(Li+)=8∶1 and it can maintain the electrochemical stability below 4.9 V.The LiFePO_(4)/Li half battery prepared with the electrolyte can be used stably at 80℃,and deliver a reversible specific capacity of 136.5 mA·h/g at 0.2 C after 80 cycles,showing an excellent cycle stability.

关 键 词：聚合物固态电解质 离子电导率 锂离子电池 热稳定性 

分 类 号：TM912[电气工程—电力电子与电力传动]