High-Entropy Amorphous Vanadium Oxide Cathode

30,000 Cycles, 97.3% Retention

Addresses the lattice strain and structural degradation in aqueous potassium-ion batteries through high-entropy doping, achieving high capacity alongside exceptional cycling durability.

Zhang, Qi · Fayin, Liu · Ali, Usman · Li, Lu · Wang, Chungang · Liu, Bingqiu

Angewandte Chemie - International Edition 2026

Specifications

Specific Capacity

{'zh': '110.4', 'en': '110.4'} mAh·g⁻¹

Capacity Retention

{'zh': '97.3', 'en': '97.3'} %

Advantages

Near-zero fade over 30,000 cycles

The amorphous network and high-entropy doping suppress vanadium dissolution and maintain structural integrity, enabling extraordinary cycling endurance.

High capacity achieved

Water-driven amorphization inherently boosts capacity, and the high-entropy design retains this benefit while resolving the associated structural instability.

Faster K⁺ diffusion

Theoretical calculations show that the high-entropy strategy lowers the K⁺ diffusion barrier, promoting high-rate capability.

Enhanced electronic conductivity

The high-entropy doping enhances electronic conductivity, improving charge transport.

Applications

• aqueous potassium-ion batteries：Replace degradable crystalline V₂O₅ with high-entropy amorphous cathode to extend battery lifespan.
• safe energy storage：Aqueous electrolyte is non-flammable; with stable cathode, achieves intrinsically safe long-life storage.
• large-scale energy storage：Low-cost aqueous system with ultra-long-life cathode suits grid-scale peak shaving.