Zinc-manganese bimetallic sulfides anchored on the surface of corn stalk carbon used as the anode of lithium ion batteries

Abstract

Transition metal sulfide, as a type of anode material for lithium-ion batteries, has been widely concerned by researchers because of its high theoretical capacity and good electrochemical performance. However, with the insertion and deintercalation of lithium ions during the reaction, unstable volume changes constrain the electrochemical properties of the negative electrode materials. In this paper, a novel ZnMn₂S₄/corn stalk carbon composite was prepared. After 100 cycles at a current density of 0.2C (1C = 784 mAhg^-1), it has a specific discharge capacity of 1015.2 mAhg^-1. It is worth noting that the lithium ion storage capacity of the negative electrode material shows an upward trend with the increase of the number of charge and discharge cycles. The capacity was increased to 898.1 mAhg^-1 after 1000 cycles of charge and discharge at a current density of 2C. This excellent performance improvement is mainly due to the synergistic interaction of corn stalk carbon and ZnMn₂S₄ particles, which promotes charge transfer and reduces volume change. This work provides a method for preparing high-efficiency anode materials for lithium-ion batteries.