Inducing favorable dual-substitution reactivity by doping Mo6+ and F− to enhance electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials

Abstract

Lithium-ion batteries are a hot spot of modern energy research due to the advantage of capacity and cost. As a new type of green energy, lithium-ion batteries have a far-reaching influence on the sustainable development of the environment, and the wide application of it can effectively reduce the exploitation of fossil fuels. However, the high specific capacity is also accompanied by some irreversible problems, such as poor cyclic performance and the rapid decay of discharge capacity with high current density. In view of these problems, we employ a dual-modification strategy to co-dope LiNi0.6Co0.2Mn0.2O2 by Mo6+ and F−. The addition of Mo6+ widens the interval layers and F− was utilized to lessen the release of lattice oxygen with a purpose of enhancing cyclical stability. After 50 cycles, the dual-substitution of LiNi0.6Co0.2Mn0.2O2 displayed distinguished capacity retention of 89.6% with 137.7 mAh g−1 at 0.5C. It's a feasible strategy to enhance the electrochemical performance of cathode materials.