Preparation technology and properties of modified single-crystalline LiNi_0.83Co_0.12Mn_0.05O₂ cathode materials by doping and coating

Ni-rich ternary positive materials have become one of the most preferred cathode materials for application in power lithium-ion batteries owing to their high energy density. However, these cathode materials suffer from inferior cycling performance and poor rate capability, seriously impeding their practical application to scale. The single crystallization of ternary materials can effectively mitigate the generation of particle cracking and improve the cycling stability of Ni-rich cathode materials. At the same time, high-valence cationic doping can effectively improve the transmission rate of lithium ions, and the charge-discharge performance of high-nickel ternary materials. In this paper, nickel-rich single crystal LiNi_0.83Co_0.12Mn_0.05O₂ materials doped with W⁶⁺ and Zr⁴⁺, combined with H₃BO₃ and Al₂O₃ double coating was prepared by high-temperature solid phase method, and their changes in electrochemical properties was explored. It is found that LiNi_0.83Co_0.12Mn_0.05O₂ doped with W-Zr displays better electrochemical performance compared with the un-doped cathode under the different magnifications specific discharge capacity in 3.0-4.3 V. The capacity retention rate of LiNi_0.83Co_0.12Mn_0.05O₂ materials with H₃BO₃ and Al₂O₃ double coating was 96.7% after 100 cycles at 1.0 C.