3D-Structured Polyoxometalate Microcrystals with Enhanced Rate Capability and Cycle Stability for Lithium-Ion Storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Polyoxometalates (POMs) face challenges in lithium-ion storage due to poor rate capability and cycle stability.
• Developing 3D macrostructures for POMs is crucial for practical applications.

Purpose of the Study:

• To fabricate 3D structured polyoxometalates for improved lithium-ion storage.
• To investigate the electrochemical performance of these novel POM structures.

Main Methods:

• A facile hydrothermal strategy was employed to synthesize Co8W12O42(OH)4(H2O)8 microcrystals (CoW-POM) on a foamed substrate.
• Electrochemical performance was evaluated, including specific capacity, rate capability, and cycle life.

Main Results:

• The CoW-POM exhibited significantly enhanced electrochemical performance compared to CoWO4 aggregates (CoW-Salt).
• CoW-POM delivered a reversible capacity of 737.8 mA h g-1 at 0.1 A g-1.
• It maintained 90.1% capacity retention after 100 cycles, demonstrating excellent stability.

Conclusions:

• The 3D structured CoW-POM effectively overcomes the limitations of traditional POMs in lithium-ion storage.
• This work advances POM applications in energy storage and provides a method for creating 3D POM structures.