A highly ionic transference number eutectogel hybrid electrolytes based on spontaneous coupling inhibitor for solid-state lithium metal batteries  

作　　者：Linnan Bi Xiongbang Wei Yuhong Qiu Yaochen Song Xin Long Zhi Chen Sizhe Wang Jiaxuan Liao 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China [2]The Yangtze Delta Region Institute(Quzhou),University of Electronic Science and Technology of China,Quzhou 324000,China [3]School of Materials Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science&Technology,Xi’an 710021,China

出　　处：《Nano Research》2023年第1期1717-1725,共9页纳米研究（英文版）

基　　金：This work was supported by the International Cooperation Projects of Sichuan Provincial Department of Science and Technology(No.2021YFH0126);Quzhou Science and Technology Bureau Project(No.2021D006);the Fundamental Research Funds for the Central Universities(No.A030202063008029);The China Postdoctoral Science Foundation(Nos.2021T140433,2020M683408);the Natural Science Foundation of Shaanxi Province(No.2021JQ-538).

摘　　要：Polymer-based solid electrolytes have been extensively studied for solid-state lithium metal batteries to achieve high energy density and reliable security.But,its practical application is severely limited by low ionic conductivity and slow Li+transference.Herein,based on the“binary electrolytes”of poly(vinylidene fluoride-chlorotrifluoroethylene)(P(VDF-CTFE))and lithium salt(LiTFSI),a kind of eutectogel hybrid electrolytes(EHEs)with high Li+transference number was developed via tuning the spontaneous coupling of charge and vacated space generated by Li-cation diffusion utilizing the Li6.4La3Zr1.4Ta0.6O12(LLZTO)dopant.LLZTO doping promotes the dissociation of lithium salt,increases Li+carrier density,and boosts ion jumping and the coordination/decoupling reactions of Li+.As a result,the optimized EHEs-10%possess a high Li-transference number of 0.86 and a high Li+conductivity of 3.2×10–4 S·cm–1 at room temperature.Moreover,the prepared EHEs-10%composite solid electrolyte presents excellent lithiumphilic and compatibility,and can be tested stably for 1,200 h at 0.3 mA·cm–2 with assembled lithium symmetric batteries.Likewise,the EHEs-10%films match well with high-loading LiFePO4 and LiCoO2 cathodes(>10 mg·cm–2)and exhibit remarkable interface stability.Particularly,the LiFePO4//EHEs-10%//Li and LiCoO2//EHEs-10%//Li cells deliver high rate performance of 118 mAh·g–1 at 1 C and 93.7 mAh·g–1 at 2 C with coulombic efficiency of 99.3%and 98.1%,respectively.This work provides an in-depth understanding and new insights into our design for polymer electrolytes with fast Li+diffusion.

关 键 词：poly(vinylidene fluoride-chlorotrifluoroethylene)(P(VDF-CTFE)) Li6.4La3Zr1.4Ta0.6O12(LLZTO) ionic transference numbers eutectic solvent composite electrolytes solid state lithium metal battery 

分 类 号：TM912[电气工程—电力电子与电力传动]