The chemical formula of sodium iron sulfate is Na2Fe2 (SO4) 3, and its structure is composed of sodium ions Composed of iron ions and sulfate ions. In electrochemical reactions, sodium iron sulfate can release or absorb metal ions such as lithium ions and sodium ions through ion exchange reactions, achieving the charging and discharging process of batteries.

As a positive electrode material, sodium iron sulfate has the following advantages: 

1. High specific capacity: Sodium iron sulfate has a higher specific capacity, which can store more charge capacity and improve the energy density of the battery.

2. High cycling stability: Sodium iron sulfate has good cycling stability and can maintain high charge capacity and energy conversion efficiency in multiple charge and discharge cycles.

3. High temperature resistance: Sodium iron sulfate has good thermal stability and can maintain high battery performance in high-temperature environments.

4. Good safety: Sodium iron sulfate has low self ignition and explosive properties, which can ensure the safety of the battery during use.