Diluted low concentration electrolyte for interphase stabilization of high-voltage LiNi_(0.5)Mn_(1.5)O_(4) cathode  

作　　者：Tao Li Ziyu Chen Fengwei Bai Chengzong Li Yan Li 

机构地区：[1]School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,Hunan,China

出　　处：《Journal of Energy Chemistry》2023年第6期404-409,I0010,共7页能源化学（英文版）

基　　金：supported by the Fund of University of South China (No.201RGC013 and N0.200XQD052)。

摘　　要：The Co-free Li Ni_(0.5)Mn_(1.5)O_(4)(LNMO)is a promising cathode for lithium-ion batteries owing to its high operating voltage and low costs.However,the synthesis of LNMO is generally time and energy consuming,and its practical application is hindered by the lack of a compatible electrolyte.Herein,a spray pyrolysis-based energy-saving synthesis method as well as a diluted low concentration electrolyte(0.5 M LiPF_(6) in a mixture of fluoroethylene carbonate/dimethyl carbonate/1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether(FEC:DMC:TTE,1:4:5 by volume))are proposed to address these challenges.Owing to the unique features of the precursor prepared by spray pyrolysis,well-crystallized LNMO single-crystal can be obtained within 1 h calcination at 900℃.Besides,the fluorinated interphases derived from the diluted low concentration electrolyte not only mitigate the Mn dissolution and Al corrosion at the cathode side,but also suppresses dendritic Li deposition at the anode side,thus enabling stable cycling of both LNMO and Li metal anode.Thus,30μm Li|LNMO(1.75 m A h cm^(-2))cells achieve a high capacity retention(90.9%)after 168 cycles in the diluted low concentration electrolyte.

关 键 词：Cobalt free cathode LiNi_(0.5)Mn_(1.5)O_(4) Spray pyrolysis Low concentration electrolyte Lithium-ion batteries 

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]