文献类型：期刊文献

英文题名：Enabling uniform Li deposition behavior by introducing a NO3--based ionic liquid additive into carbonate electrolyte for high-voltage Li metal batteries

作者：Huang, Gaoxu[1];Chen, Guoli[1];Jin, Xiaopan[1];Ge, Kaiming[1];Guan, Mengjia[1];Li, Yongsheng[1,2]

机构：[1]East China Univ Sci & Technol, Lab Low Dimens Mat Chem, Key Lab Ultrafine Mat, Minist Educ,Frontier Sci Ctr Mat Biol & Dynam Chem, Shanghai 200237, Peoples R China;[2]Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China

年份：2023

卷号：556

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20225113267958);WOS:【SCI-EXPANDED(收录号:WOS:000961054700004)】；

基金：The authors acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 51621002 and 51972112) , the Leading Talents in Shanghai in 2018 and the 111 project (B14018).

语种：英文

外文关键词：Electrolyte additive; Lithium metal anode; Ionic liquid; Coulombic efficiency; N-containing SEI layer

摘要：The nonuniform lithium deposition behavior and low deposition/dissolution reversibility are the most significant obstacles for practical high-energy-density lithium metal batteries (LMBs). Herein, a novel 1-ethyl-3-methylimi-dazolium nitrate ionic liquid ([EMIm][NO3] IL) is proposed to incorporate into the conventional carbonate electrolyte with a small amount of 1,2-dimethoxyethane (DME) as the cosolvent. A high solubility of 0.5 M [EMIm][NO3] in the carbonate electrolyte is achieved for high-voltage LMBs by replacing traditional lithium nitrate with [EMIm][NO3] IL, where the DME cosolvent with high donicity enables the solvation of NO3- in the electrolyte system. Benefitting from the electrochemical reduction of NO3- anions, the designed electrolyte promotes the formation of highly conductive and stable solid electrolyte interface abundant with N-containing species and achieves stable Li stripping/plating behavior. As a result, the IL-modified electrolyte enables excellent electrochemical performances with improved Coulombic efficiency (>98.5%) in Li|Cu cell and stable cyclability (900 h) in Li|Li symmetric cell, respectively. More importantly, a Li|LiNi0.8Co0.1Mn0.1O2 pouch-type battery composed of high mass loading cathode (20 mg cm-2) and thin Li foil (50 mu m) maintains an impressive cycling lifespan of 100 cycles. The exploration of NO3- containing IL as a novel electrolyte additive offers a promising opportunity for achieving high-performance Li metal batteries.