Boosting high initial coulombic efficiency of hard carbon by in-situ electrochemical presodiation

作     者：Nannan Qin Yanyan Sun Chao Hu Sainan Liu Zhigao Luo Xinxin Cao Shuquan Liang Guozhao Fang Nannan Qin;Yanyan Sun;Chao Hu;Sainan Liu;Zhigao Luo;Xinxin Cao;Shuquan Liang;Guozhao Fang

作者机构：School of Materials Science and EngineeringCentral South UniversityChangsha 410083HunanChina School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083HunanChina College of ChemistryXiangtan UniversityXiangtan 411105HunanChina Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083HunanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第77卷第2期

页      面：310-316,I0008页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China,China(51932011,52072411,52104285) the Natural Science Foundation of Hunan Province,China(2021JJ20060) the Science and Technology Innovation Program of Hunan Province,China(2021RC3001) the Fundamental Research Funds for the Central Universities,China(202044011) 

主　　题：Hard carbon In situ presodiation Initial coulombic efficiency Solid electrolyte interface Sodium-ion batteries 

摘      要：Hard carbon(HC)is a promising anode material for sodium ion batteries(SIBs),whereas inferior initial coulombic efficiency(ICE)severely limits its practical *** the present work,we propose an in situ electrochemical presodiation approach to improve ICE by mixing sodium biphenyl(Na-Bp)dimethoxyethane(DME)solution with DME-based ether electrolyte.A solid electrolyte interface(SEI)could be formed beforehand on the HC electrode and Na^(+)was absorbed to nanopores and graphene stacks,compensating for the sodium loss and preventing electrolyte decomposition during the initial charge and discharge *** this way,the ICE of half-cells was increased to nearly 100%and that of full-cells from 45%to 96%with energy density from 132.9 to 230.5 W h kg^(-1).Our work provides an efficient and facile method for improving ICE,which can potentially promote the practical application of HCbased materials.