Influence of Li₂MnO₃ Content on Structure and Electrochemistry of Lithium-Rich Layered Oxides for Li-Ion Batteries

Lithium-rich layered oxides (LLOs), described as \(x\) Li₂MnO₃·(1–x)LiTMO₂ (TM = transition metal, Ni,Mn, Co, etc.) have recently been identified as promising cathode materials for high-energy storage applications. In this research, a range of cathode materials containing varying proportions of LLOs were created using the sol-gel technique to explore on structure and electrochemical properties. X-ray diffraction analysis was used to examine the crystal structure of the samples, revealing that the LLOs cathode possessed composite characteristics. Increasing the Li₂MnO₃ content was observed to enhance the stability of the lithium-rich structure, thereby boosting the capacity. However, the irreversible reaction of Li₂MnO₃ would reduce the capacity. The optimized cathode composition is 0.5Li₂MnO₃·0.5LiNi_1/3Mn_1/3Co_1/3O₂ and its discharge capacity is 250 mAh/g.