The effect on the properties of each element in the Li1.2Mn0.54Ni0.13Co0.13O2 material by the incorporation of Al

Abstract

In this paper, a lithium-rich layered cathode material Li1.2Mn0.54Ni0.13Co0.13O2 was synthesized by improving the sol-gel method. Lithium-rich manganese-based cathode materials are one of the promising next-generation lithium-ion battery cathode materials. However, this material has problems of severe capacity reduction and poor rate performance. By adding a certain amount of Al to replace the metal element in the raw material, and then testing and analyzing various produced materials, it was found that adding a certain amount of Al to replace the lithium element in the raw material can improve the cycle performance and stability of the material. XRD and SEM results show that the incorporation of Al does not significantly change the structure and morphology of the material. The results of electrochemical tests show that the Al-doped sample LMNCAO-1 has good specific capacity and stability. LMNCAO-1 has a high initial specific capacity of 271.0 mAh/g at a voltage of 2–4.8 V and a current density of 0.1 C. The initial discharge specific capacity of the sample LMNCAO-1 was 185 mAh/g at 0.5 C, and the cycle retention rate was 97.3% after 100 cycles.