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Porous structure V2O5 nanoneedle arrays modified carbon cloth for stabilizing potassium metal anodes
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DOI：10.1016/j.jelechem.2026.120068.png)
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Abstract
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The limited availability of lithium resources constrains the further development of dominant lithium-ion batteries. Potassium-ion batteries (PIBs), benefiting from the natural abundance of potassium, rapid ion transport kinetics, the high-capacity, and low-potential K metal anode, present a promising alternative. However, practical K metal anodes are plagued by dendrite growth, interfacial instability, and large volume changes. To address these issues, a potassiophilic host material (CC@V@K) was fabricated by first synthesizing V2O5 nanoneedles on carbon cloth (CC@V2O5) via in situ hydrothermal growth, followed by infiltration with molten K. This CC@V2O5 host achieves complete potassium wetting within 1 s, features a porous structure to buffer volume changes of K, and offers abundant nucleation sites for uniform K deposition. Electrochemically, the symmetric cell exhibits stable cycling for 1200 h at 0.5 mA cm-2. When paired with a K0.5V2O5 cathode, the full cell retains 85.1% capacity after 300 cycles at 20 mA g-1 and delivers 68.5 mAh g-1 at 200 mA g-1. This work demonstrates an effective host design strategy, advancing the development of practical PIBs.
Keywords:
Carbon cloth
Potassium metal anodes
Nanoneedle arrays
V2O5
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