Vanadium-Doped Mn-Based Layered Cathode

Suppresses Jahn-Teller Distortion

Through symmetric V⁴⁺ doping, the introduction of vanadium enlarges interlayer spacing and strengthens Mn-O bonds, effectively suppressing structural distortion in Mn-based cathodes during potassium-ion storage.

Zhiwang, Liu · Jinghua, Quan · Xilin, Chen · Niu, Li · Li, Hongyan

Energy Storage Materials 2025

Specifications

Capacity retention

{'zh': '88', 'en': '88'} %

Discharge specific capacity

{'zh': '85.8', 'en': '85.8'} mAh g⁻¹

Advantages

88% capacity retention after 500 cycles

The electrode retains 88% of its specific capacity after 500 cycles at 1 A g⁻¹, owing to suppressed structural distortion and stabilized layered structure by vanadium doping.

Single-phase solid-solution reaction

In situ XRD reveals a highly reversible single-phase solid-solution mechanism during potassium storage, avoiding phase-transition stress and enhancing cycling stability.

V-O bonds suppress distortion

DFT calculations show that shorter and stronger V-O bonds increase interlayer spacing and enhance Mn-O bonding, effectively suppressing the Jahn-Teller effect.

Applications

• Potassium-ion battery cathode：This powder can be directly used as a cathode for potassium-ion batteries, with enhanced cycling stability after distortion suppression.
• High-performance energy storage devices：Achieving 85.8 mAh g⁻¹ in pouch cells, it offers a cathode material for high-performance energy storage devices.
• Electrochemical energy storage applications：The solid-solution mechanism ensures reversibility, making it suitable for electrochemical energy storage applications.