Evolution and function of residual solvent in polymer-Li2B12H12 composite solid electrolyte

Xiang-Yang Ye ¹Ke-Pan Bao ¹Sai-Nan Luo ¹Xin Li ¹Tai-Qiang Chen ¹Shui-Xin Xia ¹Tao Yuan ¹Yue-Peng Pang ²Shi-You Zheng¹

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作者信息

1. School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China
2. School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Materials Science and Engineering,National University of Singapore,Singapore 119077,Singapore
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Abstract

Composite solid electrolytes(CSEs)containing polymer matrices and inorganic fillers hold promise for the next generation of solid-state batteries.However,the role of residual solvents in CSEs remains controversial.This study investigated the evolution and function of the resid-ual solvent in a polymer-Li2B12H12 CSE.A partial reaction occurred between Li2B12H12 and solvent N,N-dimethyl-formamide(DMF),which produced dimethy-laminomethanol(DMAM)in the CSE.Density functional theory calculations have revealed that DMAM forms stronger hydrogen bonds with polyvinylidene fluoride chains than DMF,which can have a plasticizing effect on the polymer matrix,leading to lower crystallinity and quicker segment motion.Therefore,this CSE exhibited improved Li-ion conducting properties,enabling the stable cycling of Li‖LiFePO4 solid-state batteries.This study provided insights into the role of residual solvents in CSEs.

Key words

Composite solid electrolyte/Residual solvent/Lithium borohydride/Plasticizing effect

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基金项目

National Natural Science Foundation of China(51971146)

National Natural Science Foundation of China(51971147)

National Natural Science Foundation of China(52171218)

National Natural Science Foundation of China(52271222)

Shanghai Municipal Science and Technology Commission(21010503100)

Major Program for the Scientific Research Innovation Plan of Shanghai Education Commission(2019-01-07-00-07-E00015)

Shanghai Outstanding Academic Leaders Plan,Guangxi Key Laboratory of Information Materials(Guilin University of Electronic Techn(201017-K)

Shanghai Rising-Star Program(20QA1407100)

General Program of Natural Science Foundation of Shanghai(20ZR1438400)

出版年

2024

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

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