The Effects of Reversibility of H2-H3 Phase Transition on Ni-Rich Layered Oxide Cathode for High-Energy Lithium-Ion Batteries

Jie Chen; Huiping Yang; Tianhao Li; Chaoyang Liu; Hui Tong; Jiaxin Chen; Zengsheng Liu; Lingfeng Xia; Zhaoyong Chen; Junfei Duan; Lingjun Li

doi:10.3389/fchem.2019.00500

The Effects of Reversibility of H2-H3 Phase Transition on Ni-Rich Layered Oxide Cathode for High-Energy Lithium-Ion Batteries

Front Chem. 2019 Jul 16:7:500. doi: 10.3389/fchem.2019.00500. eCollection 2019.

Authors

Jie Chen¹, Huiping Yang¹, Tianhao Li¹, Chaoyang Liu¹, Hui Tong², Jiaxin Chen¹, Zengsheng Liu¹, Lingfeng Xia¹, Zhaoyong Chen¹, Junfei Duan¹, Lingjun Li^{1

3}

Affiliations

¹ School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, China.
² School of Metallurgy and Environment, Central South University, Changsha, China.
³ Hunan Provincial Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments, Changsha University of Science and Technology, Changsha, China.

Abstract

Although LiNi_0.8Co_0.1Mn_0.1O₂ is attracting increasing attention on account of its high specific capacity, the moderate cycle lifetime still hinders its large-scale commercialization applications. Herein, the Ti-doped LiNi_0.8Co_0.1Mn_0.1O₂ compounds are successfully synthesized. The Li(Ni_0.8Co_0.1Mn_0.1)_0.99Ti_0.01O₂ sample exhibits the best electrochemical performance. Under the voltage range of 2.7-4.3 V, it maintains a reversible capacity of 151.01 mAh·g^-1 with the capacity retention of 83.98% after 200 cycles at 1 C. Electrochemical impedance spectroscopy (EIS) and differential capacity profiles during prolonged cycling demonstrate that the Ti doping could enhance both the abilities of electronic transition and Li ion diffusion. More importantly, Ti doping can also improve the reversibility of the H2-H3 phase transitions during charge-discharge cycles, thus improving the electrochemical performance of Ni-rich cathodes.

Keywords: LiNi0.8Co0.1Mn0.1O2; Ti-doped; cathode materials; lithium ion batteries; phase transitions.