Insights into the chemical and structural evolution of Li-rich layered oxide cathode materials

Wu, Zhi-Liang1,2; Xie, Hanjie2; Li, Yingzhi2; Zhang, Fangchang2; Wang, Zhenyu2; Zheng, Wei2; Yang, Mingyang2; Cao, Yulin3; Lu, Zhouguang2

2021-01-07

10.1039/d0qi01021a

Inorganic Chemistry Frontiers   影响因子和分区

2052-1553

Lithium-rich layered oxide cathodes have an advantage of high energy density. However, continuous capacity fading and voltage hysteresis have largely restricted their practical application. In this work, we investigated in depth the voltage-fading mechanism of Li-rich materials by in situ Raman spectroscopy, X-ray absorption near edge structure (XANES) spectroscopy, and high-resolution transmission electron microscopy (HRTEM). It has been found that the chemical and structural evolution of a Li1.2Ni0.15Co0.1Mn0.55O2 cathode is quasi-reversible in a whole charge-discharge cycle. The structural evolution is evidently irreversible upon long-term cycling, resulting in the dissolution of cations from the lattices and structural collapse, which in turn leads to undesirable voltage fading. This finding is important for a better understanding of the redox reaction mechanisms of high-capacity Li-rich cathodes.

SCI ; EI

英语

通讯

Basic Research Project of the Science and Technology Innovation Commission of Shenzhen[JCYJ20170412153139454] ; National Natural Science Foundation of China[21875097] ; Natural Science Foundation of Guangdong Province["2018A030313725","2018B030322001"] ; Professorial and Doctoral Scientific Research Foundation of Huizhou University[2020JB025]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000605454900014

ROYAL SOC CHEMISTRY

20210209756409

Cathodes ; Cobalt compounds ; High resolution transmission electron microscopy ; Lithium metallography ; Manganese compounds ; Nickel compounds ; Redox reactions ; X ray absorption ; X ray absorption near edge structure spectroscopy

Metallography:531.2 ; Electromagnetic Waves:711 ; Optical Devices and Systems:741.3 ; Chemical Reactions:802.2 ; Atomic and Molecular Physics:931.3

Web of Science

1.Huizhou Univ, Sch Chem & Mat Engn, Huizhou 516007, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Energy Mat Elect Power, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.Shenzhen Polytech, Ind Training Ctr, Phys Lab, Shenzhen 518055, Peoples R China

Wu, Zhi-Liang,Xie, Hanjie,Li, Yingzhi,et al. Insights into the chemical and structural evolution of Li-rich layered oxide cathode materials[J]. Inorganic Chemistry Frontiers,2021,8(1):127-140.

Wu, Zhi-Liang.,Xie, Hanjie.,Li, Yingzhi.,Zhang, Fangchang.,Wang, Zhenyu.,...&Lu, Zhouguang.(2021).Insights into the chemical and structural evolution of Li-rich layered oxide cathode materials.Inorganic Chemistry Frontiers,8(1),127-140.

Wu, Zhi-Liang,et al."Insights into the chemical and structural evolution of Li-rich layered oxide cathode materials".Inorganic Chemistry Frontiers 8.1(2021):127-140.