Improving the electrochemical performance of Ag-doped Ni-rich Li (Ni0.88 Co0.09 Al0.03)1−x O2 layered cathode material

Abstract

High-nickel ternary cathode materials are highly regarded for their high capacity and low cost, making them among the most promising materials for development and research. However, the development of cathode materials is hindered by the long-term capacity loss and side reactions during charging and discharging. Here, we prepared Ag⁺-doped LiNi_0.88Co_0.09Al_0.03O₂ cathode materials via the high-temperature solid-state method, which exhibited higher discharge capacity and capacity retention compared to the undoped cathode materials. The results show that the initial discharge capacity of 2.0 mol% Ag⁺-doped Li(Ni_0.88Co_0.09Al_0.03)_1−xO₂ is 225.4 mAh g^− 1, which is 16.5% higher than that of the undoped cathode material (193.5 mAh g^− 1), and the initial coulomb efficiency is 98.8% at 0.1 C. Furthermore, the initial discharge specific capacity was 223.4 mAh g^− 1, and after 100 cycles at indoor temperature at 0.2 C, the specific capacity was still 177.8 mAh g^− 1, and the capacity retention rate was as high as 95.5%. This work provides a new strategy to improve the electrochemical performance of nickel-rich cathode materials.