期刊
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
卷 33, 期 1, 页码 108-115出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2022.12.004
关键词
Lithium -ion batteries; Ni-rich; Co -free; Layered oxide cathode; Dual -doping
In this study, aluminum and zirconium dual-doped Co-free Ni-rich LiNi0.96Mn0.04O2 cathode material (NMAZ) with improved structural stability and electrochemical performance for lithium-ion batteries is prepared. The NMAZ shows low cation disordering degree and improved lithium-ion diffusion kinetics, leading to enhanced capacity retention and rate performance.
Nickel-rich and cobalt-free cathode materials have obvious advantages in the aspects of energy density and economic efficiency. However, these materials are restricted from being used in commercial lithium-ion batteries due to the problems of poor structural stability and rate capability. In this study, the aluminum and zirconium dual-doped Co-free Ni-rich LiNi0.96Mn0.04O2 cathode material (NMAZ) is prepared by a facile high-temperature solid-phase method. The obtained NMAZ shows low cation disordering degree owing to the stability of transition metal slabs induced by strong Al-O and Zr-O bonds. Besides, the kinetics of lithium-ion diffusion is significantly improved by larger c-axis and the fast lithium-ion conducting Li2ZrO3 layer on the interface. As a result, NMAZ shows an improved capacity retention of 70.3% at 1C after 100 cycles under an elevated temperature (45 & DEG;C), compared with 50.5% of pure LiNi0.96Mn0.04O2. In addition, it exhibits splendid rate performance even at higher C-rate and better thermal stability compared to bare LiNi0.96Mn0.04O2. Hence, the Al, Zr dualdoped modification is beneficial to improving the structural stability and electrochemical performance of the Ni-rich and Co-free layered oxide cathodes for Li-ion batteries.
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