Trimethyl phosphate-enhanced polyvinyl carbonate polymer electrolyte with improved interfacial stability for solid-state lithium battery  

作　　者：Fei Zheng Hao-Tong Li Yan-Zhen Zheng Dan Wang Ning-Ning Yang Hai-Yang Ding Xia Tao 

机构地区：[1]Beijing Key Laboratory of Green Recovery and Extractionof Rare and Precious Metals,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China [3]General Research Institute of Nonferrous Metals,Beijing 100088,China [4]China Automotive Battery Research Institute Co.,Ltd.,Beijing 101407,China

出　　处：《Rare Metals》2022年第6期1889-1898,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.21676017);the Opening Project of State Key Laboratory of Advanced Chemical Power Sources (No.SKL-ACPS-C-27);the Opening Project of State Key Laboratory of Organic-Inorganic Composites

摘　　要：The polyvinyl carbonate(PVC)polymer solid electrolyte can be in-situ generated in the assembled lithium-ion battery(LIBs);however,its rigid characteristic leads to uneven interface contact between electrolyte and electrodes.In this work,trimethyl phosphate(TMP)is introduced into the precursor solution for in-situ generation of flexible PVC solid electrolyte to improve the interfacial contact of elec-trolyte and electrodes together with ionic conductivity.The PVC-TMP electrolyte exhibits good interface compatibility with the lithium metal anode,and the lithium symmetric battery based on PVC-TMP electrolyte shows no obvious polarization within 1000 h cycle.As a consequence,the initial interfacial resistance of battery greatly decreases from 278Ω(LiFePO_(4)(LFP)/PVC/Li)to 93Ω(LFP/PVC-TMP/Li)at 50℃,leading to an improved cycling stability of the LFP/PVC-TMP/Li battery.Such in-situ preparation of solid electrolyte within the battery is demonstrated to be very significant for commercial application.

关 键 词：Trimethyl phosphate Solid polymer electrolyte Interface stability Compatibility Lithium ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]