Effects of the oxyfluorination of needle coke-based anode materials on the capacities and stabilities of lithium-ion batteries

Abstract

Needle cokes have emerged as an alternative anode material to graphite due to their high rate performance and cost advantages. Herein, we introduced oxygen and fluorine functional groups to increase the capacity and increase the cycling stability, respectively. Oxyfluorination was used to simultaneously introduce these two heterogeneous elements, and their effective introduction was quickly confirmed at room temperature. Compared with those of pristine needle coke-based lithium-ion batteries, the capacities of the lithium-ion batteries based on oxyfluorinated needle cokes increased by 17.9%, and the cycling stabilities of the modified batteries exceeded 92%. Therefore, introducing oxygen and fluorine functional groups into needle cokes through oxyfluorination is a viable strategy for producing anode materials for lithium-ion batteries with high rates and capacities.