Boosting High-Voltage Practical Lithium Metal Batteries with Tailored Additives  

作　　者：Jinhai You Qiong Wang Runhong Wei Li Deng Yiyang Hu Li Niu Jingkai Wang Xiaomei Zheng Junwei Li Yao Zhou Jun-Tao Li 

机构地区：[1]College of Energy,Xiamen University,Xiamen 361005,People’s Republic of China [2]Magnetism Key Laboratory of Zhejiang Province,College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,People’s Republic of China [3]Laboratory for Soft Matter and Biophysics,Department of Physics and Astronomy,KU Leuven,3001 Leuven,Belgium [4]State Key Lab of Physical Chemistry of Solid Surface,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,People’s Republic of China [5]Department of Chemical Engineering,KU Leuven,Celestijnenlaan 200F,3001 Leuven,Belgium [6]College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,Gansu,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第12期23-41,共19页纳微快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFB2502103);the Xiamen Science and Technology Project(3502Z20231057);the National Natural Science Foundation of China(Nos.22279107 and 22288102);J.You,R.Wei,and L.Niu acknowledge the China Scholarship Council(CSC)for a doctoral scholarship(Grant Nos.202006310030,202108530138,and 202108530139).

摘　　要：The lithium(Li)metal anode is widely regarded as an ideal anode material for high-energy-density batteries.However,uncontrolled Li dendrite growth often leads to unfavorable interfaces and low Coulombic efficiency(CE),limiting its broader application.Herein,an ether-based electrolyte(termed FGN-182)is formulated,exhibiting ultra-stable Li metal anodes through the incorporation of LiFSI and LiNO3 as dual salts.The synergistic effect of the dual salts facilitates the formation of a highly robust SEI film with fast Li+transport kinetics.Notably,Li||Cu half cells exhibit an average CE reaching up to 99.56%.In particular,pouch cells equipped with high-loading lithium cobalt oxide(LCO,3 mAh cm^(-2))cathodes,ultrathin Li chips(25μm),and lean electrolytes(5 g Ah-1)demonstrate outstanding cycling performance,retaining 80%capacity after 125 cycles.To address the gas issue in the cathode under high voltage,cathode additives 1,3,6-tricyanohexane is incorporated with FGN-182;the resulting high-voltage LCO||Li(4.4 V)pouch cells can cycle steadily over 93 cycles.This study demonstrates that,even with the use of ether-based electrolytes,it is possible to simultaneously achieve significant improvements in both high Li utilization and electrolyte tolerance to high voltage by exploring appropriate functional additives for both the cathode and anode.

关 键 词：Li metal anode Li dendrites LiNO_(3) 1 3 6-tricyanohexane Pouch cells 

分 类 号：TM912[电气工程—电力电子与电力传动]