Mg-substituted Prussian blue as a low-strain cathode material for aqueous Fe-ion batteries
Ge Huang1, Zefeng Lao1, Ze He1,2
1Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China. anqinyou86@whut.edu.cn.
Chemical Communications (Cambridge, England)
|March 20, 2023
Summary
Magnesium-substituted Prussian blue analogues (MgFeHCF) enhance aqueous iron-ion batteries (FIBs), offering higher capacity and improved cycle stability. This research details the cathode material and its performance characteristics.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous iron-ion batteries (FIBs) are gaining attention for their potential advantages.
- Developing high-performance cathode materials is crucial for advancing FIB technology.
Purpose of the Study:
- To construct and evaluate a Mg-substituted Prussian blue analogue (MgFeHCF) as a cathode material for FIBs.
- To investigate the Fe-ion storage mechanism and optimize battery performance.
Main Methods:
- Synthesis of Mg-substituted Prussian blue analogue (MgFeHCF).
- Electrochemical testing of MgFeHCF as a cathode in aqueous FIBs.
- In situ X-ray diffraction (XRD) for mechanism elucidation.
- Density Functional Theory (DFT) calculations for performance analysis.
Main Results:
- The MgFeHCF cathode achieved a capacity of 96 mA h g-1.
- Demonstrated enhanced stability with 70.9% capacity retention over 500 cycles.
- The Fe-ion storage mechanism was successfully revealed.
Conclusions:
- Mg-substituted Prussian blue analogues represent a promising cathode material for high-performance aqueous FIBs.
- The study provides insights into the storage mechanism, aiding future material design.
