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 0.5Li2MnO3·0.5LiNi1/3Mn1/3Co1/3O2 and its discharge capacity is 250 mAh/g.