A bifunctional nitrile additive for high-performance lithiumoxygen batteries  

作　　者：Ziwei Li Yue Yu Dongyue Yang Jin Wang Junmin Yan Gang Huang Tong Liu Xinbo Zhang 

机构地区：[1]Key Laboratory of Automobile Materials,Ministry of Education,Department of Materials Science and Engineering,Jilin University,Changchun 130022,China [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [3]Department of Chemistry and Waterloo Institute for Nanotechnology,University of Waterloo,200 University Ave.W.,Waterloo,Ontario N2L 3G1,Canada [4]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Nano Research》2024年第7期6119-6126,共8页纳米研究（英文版）

基　　金：financially supported by the National Key R&D Program of China(No.2019YFA0705700);the National Natural Science Foundation of China(Nos.U22A20437,U23A20575,52171194,52271140,and 22209138);the CAS Project for Young Scientists in Basic Research(No.YSBR-058);the China Postdoctoral Science Foundation(No.2022M713070);the National Natural Science Foundation of China Outstanding Youth Science Foundation of China(Overseas).

摘　　要：Li-O_(2)batteries with high energy density hold significant promise as next-generation energy storage systems.However,Li-O_(2)batteries have poor cycling performance at high current densities and large capacities,primarily due to the high impedance caused by the instability of the lithium anode and the sluggish kinetics in the discharge products decomposition on the cathode.Herein,we investigated a bifunctional nitrile additive(2-methoxy benzonitrile(2-MBN))with good chemical/electrochemical stability to improve the performances of Li-O_(2)batteries.The 2-MBN could actively modify the anode by ensuring uniform Li+deposition and optimizing the composition of solid electrolyte interphase(SEI).Meanwhile,it could also facilitate the decomposition of discharge products by inducing the formation of sheet-like Li_(2)O_(2),significantly reducing the battery charge overpotential.The bifunctional effects of 2-MBN for the anode and cathode enable Li-O_(2)batteries to achieve a stable lifetime of 97 cycles at a current density of 600 mA·g^(−1)with a fixed capacity of 2000 mAh·g^(−1),much better than that of Li-O_(2)batteries without 2-MBN(28 cycles).The inclusion of 2-MBN provides an effective approach for attaining high-performance Li-O_(2)batteries.

关 键 词：nitrile additives Li-O_(2)batteries lithium metal anode charge overpotential 

分 类 号：TM912[电气工程—电力电子与电力传动]