Thin buffer layer assist carbon-modifying separator for long-life lithium metal anodes  

作　　者：Jiaqi Li Hongsheng Jia Haibo Li Xing Zhao Guiru Sun Zhiyong Chang Lei Li Ming Jin Zhao Wang Ming Feng 

机构地区：[1]Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,Jilin,China [2]Key Laboratory of Bionic Engineering,Ministry of Education,Jilin University,Changchun 130022,Jilin,China [3]College of Biological and Agricultural Engineering,Jilin University,Changchun 130022,Jilin,China [4]Aircraft System Teaching and Research Section,Air Force Aviation University,Changchun 130022,Jilin,China

出　　处：《Journal of Energy Chemistry》2021年第6期61-68,I0003,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21978110,21905110,and 51772126);the Jilin Province Science and Technology Department Program(Nos.20200201187JC,20200201236JC,20190201309JC,20190101009JH and 20180201079GX);the Fundamental Research Funds for the Central Universities(Jilin University,JLU);the “13th five-year” Science and Technology Project of Jilin Provincial Education Department(Nos.JJKH_(2)0200407KJ,JJKH_(2)0200411KJ and JJKH_(2)0191003KJ);the Jilin Province Development and Reform Commission Program(Nos.2020C026-3 and 2019C042-1);the Jilin Province Fund for Talent Development Program(No.[2019]874)。

摘　　要：The guided Li dendrite growth by carbon-modifying separator is believed to be an effective strategy for enhancing life of lithium metal batteries(LMBs).However,the weak adhesions,as well as the large interface impedance between the smooth separator and the carbon functional layer(CFL) lead to an easily peeling of the CFL after repetitive cycles.Herein,we propose a promising solution by an inserting thin buffer layer(TBL) to strengthen the adhesion between CFL and separator as a double modifying layer(C-TBL) of the LMBs separator,which greatly improves the stability of the CFL and provides an effective Li metal anode protection.Owing to the sufficient ionic conductivity,chemical stability and strong adhesion to the separator of the TBL,it can avoid the failure of the CFL functionality with small interface impedance.Moreover,the CFL effectively reduces localized flux of Li+ through its abundant pores.The Li/Li cell with C-TBL separator displays the Li dendrite-free and stable cycling performance for at least 1500 h.When LiFePO_(4)(LFP) is employed as the cathode electrode,the assembled full cell with C-TBL separator shows the excellent rate performance and outstanding cycling capability.Our study builds a stable Li+conducting "bridge" between the functional layer and the separator in stabilizing Li metal anode,and provides a fresh idea of the artificial separator of LMBs.

关 键 词：Dendrite-free metal anodes Lithium metal protection SEPARATOR Lithium-metal rechargeable battery Lithium fluoride 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]