MXene surface-attached Ni2P on lithium-sulfur battery catalytic effect

Abstract

Because lithium-sulfur batteries have inherent internal problems that hinder their commercial development, this work effectively improves the aforementioned defects from the cathode material. MXene functions as a conductive substrate to optimize the conductivity of lithium-sulfur battery cathode material. Simultaneously, the addition of Ni2P is capable of significantly limiting the shuttle effect. This is mostly owing to the high polar Ni2P adsorption action on polar intermediate polysulfides. When a sufficient amount of Ni2P is added, electrochemical performance tests reveal that the battery has a low polarization voltage, which is conducive to the reversible process. Furthermore, at a current density of 0.1C, the initial discharge specific capacity of MXene@Ni2P-1/S is 1311.2 mAh/g. The discharge specific capacity of the battery remained at 626.7 mAh/g after 200 cycles at 0.2C, and the coulomb efficiency remained above 97.5%, demonstrating that the MXene@Ni2P-1/S composite material could significantly increase the battery's reaction kinetic performance.