Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating

Journal article

Abstract The high-nickel cathode material of LiNi0.8Co0.15Al0.05O2 (LNCA) has a prospective application for lithium-ion batteries due to the high capacity and low cost. However, the side reaction between the electrolyte and the electrode seriously affects the cycling stability of lithium-ion batteries. In this work, Ni2+ preoxidation and the optimization of calcination temperature were carried out to reduce the cation mixing of LNCA, and solid-phase Al-doping improved the uniformity of element distribution and the orderliness of the layered structure. In addition, the surface of LNCA was homogeneously modified with ZnO coating by a facile wet-chemical route. Compared to the pristine LNCA, the optimized ZnO-coated LNCA showed excellent electrochemical performance with the first discharge-specific capacity of 187.5 mA h g−1, and the capacity retention of 91.3% at 0.2C after 100 cycles. The experiment demonstrated that the improved electrochemical performance of ZnO-coated LNCA is assigned to the surface coating of ZnO which protects LNCA from being corroded by the electrolyte during cycling.

Authors: Wang, F; Hong, R; Lu, X; Liu, H; Zhu, Y

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: De Gruyter
• Journal: Nanotechnology Reviews
• Volume: 10
• Issue: 1
• Pages: 210-220
• Publication date: 2021-01-01
• DOI: 10.1515/ntrev-2021-0020
• EISSN: 2191-9097
• ISSN: 2191-9089
• Language: English
• Keywords: Nickel; Cathode; Composite material; Catalysis; Calcination; Chemistry; Metallurgy; Lithium (medication); Electrode; Chemical engineering; Coating; Electrochemistry; Materials science; Electrolyte