Enhancement of electrochemical performance in lithium-ion battery via tantalum oxide coated nickel-rich cathode materials  

作　　者：Fengling Chen Jiannan Lin Yifan Chen Binbin Dong Chujun Yin Siying Tian Dapeng Sun Jing Xie Zhenyu Zhang Hong Li Chaobo Li 陈峰岭;林建楠;陈一帆;董彬彬;尹楚君;田飔莹;孙大鹏;解婧;张振宇;李泓;李超波(Institute of Microelectronics,Chinese Academy of Sciences,Beiing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Beijing Welion New Energy Technology Co.,Ltd,Beijing 102402,China)

机构地区：[1]Institute of Microelectronics,Chinese Academy of Sciences,Beiing 100029,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]Beijing Welion New Energy Technology Co.,Ltd,Beijing 102402,China

出　　处：《Chinese Physics B》2022年第5期683-690,共8页中国物理B（英文版）

基　　金：Project supported by the Key Laboratory Fund(Grant No.6142804200303)from Science and Technology on Microsystem Laboratory;the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences:Original Innovation Projects from 0 to 1(Grant No.ZDBS-LY-JSC010);the Key Research and Development Project of the Department of Science and Technology of Jiangsu Province,China(Grant No.BE2020003);the Beijing Municipal Science and Technology Commission(Grant No.Z191100004719001);the National Key Research and Development Program of China(Grant No.2017YFB0405400)。

摘　　要：Nickel-rich cathode materials are increasingly being applied in commercial lithium-ion batteries to realize higher specific capacity as well as improved energy density.However,low structural stability and rapid capacity decay at high voltage and temperature hinder their rapid large-scale application.Herein,a wet chemical method followed by a post-annealing process is utilized to realize the surface coating of tantalum oxide on LiNi_(0.88)Mn_(0.03)Co_(0.09)O_(2),and the electrochemical performance is improved.The modified Li Ni_(0.88)Mn_(0.03)Co_(0.09)O_(2)displays an initial discharge capacity of~233 m Ah/g at0.1 C and 174 m Ah/g at 1 C after 150 cycles in the voltage range of 3.0 V–4.4 V at 45℃,and it also exhibits an enhanced rate capability with 118 m Ah/g at 5 C.The excellent performance is due to the introduction of tantalum oxide as a stable and functional layer to protect the surface of LiNi_(0.88)Mn_(0.03)Co_(0.09)O_(2),and the surface side reactions and cation mixing are suppressed at the same time without hampering the charge transfer kinetics.

关 键 词：LiNi0.88Mn0.03Co0.09O2 tantalum oxide surface coating lithium-ion battery cathode material 

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]