Research progress of metal selenides anode materials for sodium-ion batteries

Abstract

Sodium-ion battery has become the most likely new generation energy storage system to replace lithium-ion batteries because of their rich resources and environmental friendliness. However, the lack of anode materials with high capacity and long cycle stability has become the key to hindering the development of sodium-ion batteries. Metal selenides have the advantages of high theoretical capacity, high security and easy morphology design, and have gradually become potential alternative materials for the anode electrode of a new generation of sodium-ion batteries. However, the intrinsic conductivity of metal selenides is relatively low, resulting in poor cycle stability, which generally needs to be improved by morphology design, doping, or compounding. This article introduces the research progress in recent years of various metal selenides in sodium-ion batteries, focuses on the current problems and corresponding solutions, and looks forward to the development prospects of metal selenides in sodium-ion batteries.