Amorphizing Iron Molybdate as a High-Capacity Cathode for Lithium Metal Batteries Enabled by Multiple Insertion...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Rising demand for electric vehicles and energy storage fuels interest in lithium-metal batteries (LMBs).
• Current LMBs utilize lithium-ion battery cathodes with limited reversible capacity, hindering performance.
• A need exists for advanced cathode materials with enhanced lithium-ion accommodation.

Purpose of the Study:

• To develop a high-capacity cathode material for lithium-metal batteries.
• To investigate the electrochemical properties of amorphizing iron molybdate (a-FMO).
• To explore the potential of metastable structures for improved battery performance.

Main Methods:

• Synthesis and characterization of amorphizing iron molybdate (a-Fe2(MoO4)3).
• Electrochemical testing of the a-FMO cathode in a battery configuration.
• In-situ analysis of structural evolution and redox reactions.

Main Results:

• The a-FMO cathode achieved a reversible capacity of 254 mAh g⁻¹.
• Stable cycling performance was demonstrated over 500 cycles.
• High specific energy density (597 Wh kg⁻¹) and all-climate adaptability (-40 to 60 °C) were observed.

Conclusions:

• Amorphizing iron molybdate (a-FMO) is a promising high-capacity cathode material for LMBs.
• Metastable structures and amorphizing properties enhance lithium-ion storage and migration.
• This work expands material design strategies for high-energy-density cathodes.