Glucose-based surface modification of Li1.2Mn0.54Ni0.13Co0.13O2 as a cathode material for lithium-ion batteries

Under high voltage (> 4.4 V), many side reactions between the Li-rich Mn-based cathode materials and the electrolyte can occur, with a transition from the active lamellar phase to the inactive spinel phase occurring during cycling, which can reduce the cycle stability of the material. Glucose-based modification can significantly promote the electrochemical performance of Li1.2Mn0.54Ni0.13Co0.13O2. After glucose-based modification, the sample surface after treatment confirmed the presence of chemically activated Li2MnO3 components and the LiMn2O4 spinel phases. Furthermore, the material capacity changed significantly at high rates. The 1 C discharge capacity of the raw material was 165.2 mAh/g, and the sample at 1 C discharge capacity after 10% glucose treatment was 183 mAh/g, while the capacity retention rate after 100 cycles was 98.5%. The initial coulombic efficiency of the sample after treatment increased from 71.3% for the raw material to 78.5%, and the impedance also significantly reduced. The significant improvement in electrochemical performance of the sample after treatment was attributed to the newly formed layered spinel surface and chemically activated Li2MnO3 phase, which significantly enhanced the redox reactions on the surface of the positive electrode, accelerating the diffusion rate of Li+ and adjusting the electrochemical evolution behavior of the Lirich layered oxides.