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Electrolysis

Electrolysis

In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...

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Related Experiment Video

Updated: Aug 11, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

Phase-engineered cathode for super-stable potassium storage.

Lichen Wu^1,2, Hongwei Fu^1,2, Shu Li^1,2

¹School of Physics and Electronics, Hunan University, Changsha, 410082, PR China.

Nature Communications

|February 6, 2023

Summary

This summary is machine-generated.

Amorphous vanadium dioxide (VO2) demonstrates superior performance as a potassium-ion battery cathode compared to crystalline phases. Phase engineering of VO2 enhances electrochemical stability and capacity for rechargeable batteries.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Crystal phase structure critically impacts cathode material performance in batteries.
Phase transformations during cycling induce stress, leading to capacity degradation.
Optimizing cathode materials is essential for advancing rechargeable battery technology.

Purpose of the Study:

To investigate phase-engineered vanadium dioxide (VO2) as a cathode material for potassium-ion batteries.
To compare the potassium-ion storage capabilities of amorphous and crystalline VO2 phases.
To demonstrate the benefits of phase engineering for improving battery performance.

Main Methods:

Synthesis and characterization of different VO2 crystal phases.
Electrochemical testing of VO2 phases as potassium-ion battery cathodes.
Analysis of cycling stability, capacity, and coulombic efficiency.

Main Results:

Amorphous VO2 exhibits significantly enhanced potassium-ion storage compared to crystalline M phase VO2.
Amorphous VO2 demonstrates alleviated volume variation and improved electrochemical performance.
A maximum capacity of 111 mAh g⁻¹ was achieved at 20 mA g⁻¹, with 80% capacity retention after 8500 cycles at 500 mA g⁻¹.

Conclusions:

Phase engineering of VO2 is an effective strategy for developing advanced potassium-ion battery cathodes.
Amorphous VO2 offers superior electrochemical properties for K+ ion storage.
This research provides insights into material optimization for high-performance rechargeable batteries.