As a novel electrochemical power resource, sodium-ion battery (NIB) is advantageous in abundant resources for electrode materials, significantly low cost, relatively high specific capacity and efficiency. Therefore, NIB is regarded as a competitive candidate for large-scale energy storage usage and has potential for improving renewable energy resources grid-connected ability and power energy quality. Under this background, NIB is attracting extensive attentions worldwide and developing fast. In this review, we focus on the latest progress in the anode, cathode materials and electrolytes for NIB. After discussing the key technologies on materials of NIB, we attempt to give some suggestions on future research directions of NIB for relevant researchers and manufacturers in China.

Contents
1 Introduction
2 Anode materials for sodium-ion batteries
2.1 Carbon materials
2.2 Alloy materials
2.3 Metal oxide materials
3 Cathode materials for sodium-ion batteries
3.1 Metal oxide materials
3.2 Poly-anion materials
3.3 Fluoride materials
4 Electrolyte materials
5 Aqueous Na-ion batteries
6 Conclusions