Influence of synergistic effect of LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)@Cr_(2)O_(5)composite on the electrochemical properties

作     者：Yunke Wang Yongjia Li Yenan Zhang Guozheng Zha Feng Liang Yongnian Dai Yaochun Yao Yunke Wang;Yongjia Li;Yenan Zhang;Guozheng Zha;Feng Liang;Yongnian Dai;Yaochun Yao

作者机构：The National Engineering Laboratory for Vacuum MetallurgyKunming University of Science and TechnologyKunming 650093China Engineering Laboratory for Advanced Battery and Materials of Yunnan ProvinceKunming University of Science and TechnologyKunming 650093China Faculty of Metallurgy and MiningKunming Metallurgy CollegeKunming 650033China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2021年第34卷第5期

页      面：327-336页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (52064031) the Program for Innovative Research Team in the University of Ministry of Education of China (IRT_17R48) National Natural Science Foundation of China (51674129) 

主　　题：NCA@Cr_(2)O_(5) composite Cathode material Synergistic effect Electrochemical properties Low voltage 

摘      要：LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)@Cr_(2)O_(5)composite electrode combines the high rate-capability characteristics of NCA with the stability of Cr_(2)O_(5),playing a synergistic role in improving the cyclic stability,initial discharge capacity and the security of low cut-off voltage(2.0 V).When the mass ratio of Cr_(2)O_(5)in NCA is 45%(mass),the capacity retention rate increases from 58.5% without Cr_(2)O_(5)to 69.3% in the range of 2.0-4.3 *** initial discharge capacity of NCA@Cr_(2)O_(5)composite material is 211.4 mA·h·g^(-1),its first coulombic efficiency is 94.2%,and the charging capacity remains approximately constant when mixed with 15%(mass)Cr_(2)O_(5).The reason for the improvement of the initial charge-discharge efficiency(ICDE)was *** and cyclic voltammetry analysis reveal more detailed reasons of the observed *** with NCA cathode material,the NCA@Cr_(2)O_(5)composite material can provide not only additional stable sites and channels for Li^(+)insertion/extraction to make up for the loss of active Li^(+)sites and prevent the accumulation of Li+in the circulation process,but also protect the NCA electrode from the corrosion of the electrolyte decomposition by the Cr_(2)O_(5)nanoparticles adhering to NCA interface.