Bifunctional fluoropyridinium-based cationic electrolyte additive for dendrite-free Li metal anode

作     者：Kunyao Peng Pei Tang Qianqian Yao Qingyun Dou Xingbin Yan Kunyao Peng;Pei Tang;Qianqian Yao;Qingyun Dou;Xingbin Yan

作者机构：Department of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou 510275China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2023年第16卷第7期

页      面：9530-9537页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：This work was financially supported by the National Key R&D Program of China(No.2022YFB2402600) National Natural Science Foundation of China(No.22279166) Basic and Applied Basic Research Foundation of Guangdong Province-Regional joint fund project(No.2022B1515120019) the Fundamental Research Funds for the Central Universities,Sun Yat-Sen University(Nos.22qntd0101 and 22dfx01) 

主　　题：lithium metal anode electrolyte additive solid electrolyte interphase(SEI) electrostatic repulsion lithium metal battery(LMB) 

摘      要：Although lithium metal has become a promising anode material for high-energy batteries owing to its high specific capacity and the lowest reduction potential,the continuous side reactions with electrolyte as well as the safety problem caused by Li dendrite growth restrict Li anode’s practical ***,we demonstrate that N-fluoropyridinium(ArF^(+))bis(trifluoromethane)sulfonimide(TFSI-)as an electrolyte additive can protect the lithium metal by both solid electrolyte interphase(SEI)protection and electrostatic repulsion *** ArF+cations not only participate in forming F,Ncontaining SEI protective layer on Li surface,but also act as a cationic repellent during Li deposition to inhibit Li dendrite *** a result,the cycle performance of Li symmetric cells and Li||LiFePO_(4)full cells were significantly improved by using ArFTFSIadded *** study provides an electrolyte additive strategy for Li anode realizing SEI protection and electrostatic repulsion simultaneously.