Intricate Hollow-Core Heterojunction Structure Toward Advanced Sodium Ion Batteries System

Abstract

Sodium-ion batteries (SIBs) considered an effective alternative to lithium-ion batteries. Electrode material is the main factor to determine the batteries performance, and design anode materials with high specific capacity, superior rate performance and long cycle life is the key to develop the next generation batteries system. Currently, the development of bimetallic heterojunction with high pseudocapacitance effect is of great significance for improving SIBs performance. In this work, there-dimensional (3D) hollow cube bimetallic sulfide heterojunction prepared by hard template method, and the effect of hollow structure on sodium storage properties systematically studied. The discharge capacity is about 225 mAh g-1 at a high current of 1 A g-1. In conclusion, the unique yolk shell structure and bimetal synergistic effect can comprehensively improve the electrochemical performance, which expected to promote the commercialization process of SIBs, and provide theoretical and experimental basis for the new materials design.

Keywords: Hollow-core, Bimetallic heterojunction, Battery performance