Converting LiNO_(3)additive to single nitrogenous component Li_(2)N_(2)O_(2)SEI layer on Li metal anode in carbonate-based electrolyte  

作　　者：Kunyao Peng Xianbin Wang Xingbin Yan 

机构地区：[1]Department of Materials Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [2]State Key Laboratory of Optoelectronic Materials and Technologies,Guangzhou 510275,China

出　　处：《Chinese Chemical Letters》2024年第9期452-457,共6页中国化学快报（英文版）

基　　金：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).

摘　　要：With the increasing demand for high energy density energy storage device,Li metal has received intensive attention for its ultrahigh capacity and the lowest redox potential.LiNO_(3)is widely used as electrolyte additive for ether electrolyte,which can improve the cycle performance of Li metal anode.Compared to ethers,carbonates are more suitable for Li metal batteries with high voltage cathode because they have a wider electrochemical window.However,LiNO_(3)performs poor solubility in carbonate electrolyte,restricting its application in high voltage Li battery.Herein,we presented a facile method to introduce abundant LiNO_(3)additive to carbonate electrolyte system by introducing LiNO_(3)-PAN es as the interlayer of the cell.LiNO_(3)-PAN es is in sufficient contact with the electrolyte so that it can continuously releases LiNO_(3)to assist the formation of Li_(2)N_(2)O_(2)-rich single nitrogenous component SEI layer on Li surface.With the help of LiNO_(3)-PAN es,Li metal anode shows excellent cycle stability even at a high current density of 4mA/cm^(2),so that the cycle performance of the full cells was significantly improved,whether in the anode-free Cu||LFP cell or the Li||NCM622 cell.

关 键 词：Li metal anode Electrolyte additive Lithium nitrate Solid electrolyte interphase Carbonate electrolyte 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]