Irving-Williams series guided construction of a stable core-shell MnHCF@CuHCF cathode

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Prussian blue analogues are promising cathode materials for sodium-ion batteries.
• Manganese hexacyanoferrate (MnHCF) suffers from Jahn-Teller distortion and manganese dissolution, limiting its performance.
• Developing stable and high-performance cathodes is crucial for advancing sodium-ion battery technology.

Purpose of the Study:

• To construct a core-shell MnHCF@CuHCF cathode material.
• To investigate the effect of a CuHCF shell on the electrochemical properties of MnHCF.
• To provide a feasible strategy for high-performance Prussian blue analogue cathodes.

Main Methods:

• A one-step co-precipitation method was employed to synthesize the core-shell MnHCF@CuHCF structure.
• The synthesis was guided by the Irving-Williams series principles.
• Electrochemical performance was evaluated for sodium-ion battery applications.

Main Results:

• The core-shell MnHCF@CuHCF structure was successfully synthesized.
• The CuHCF shell effectively suppressed Jahn-Teller distortion and Mn dissolution.
• The modified cathode exhibited enhanced rate capability and cycling stability in sodium-ion batteries.

Conclusions:

• The core-shell MnHCF@CuHCF cathode presents a viable strategy for high-performance sodium-ion batteries.
• The robust CuHCF shell significantly improves the stability and electrochemical properties of MnHCF.
• This approach offers a pathway for developing advanced Prussian blue analogue cathode materials.