Structural optimization of VO2/NH4V4O10 cathode materials for high-performance wide-temperature zinc-ion batteries

doi:10.1039/D5QI01098E

Structural optimization of VO2/NH4V4O10 cathode materials for high-performance wide-temperature zinc-ion batteries

2025-07-26

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DOI：10.1039/D5QI01098E

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Ammonium vanadate is considered as one of the most desirable cathodes for aqueous zinc ion batteries due to its favorable theoretical capacity and open crystal structure. Nevertheless; its further development is still limited by poor structural stability; low electrical conductivity and limited electrolyte compatibility. In this work; we propose a regulation strategy through the pre-introduction of Ce ions. The incorporation of Ce ions increases the interlayer spacing of the host material; which improves the electrical conductivity and accelerates the ion transfer efficiency. The assembled Zn//0.05Ce-VO/NHVO cells deliver an initial capacity of 547.8 mAh g−1 at 0.2 A g−1. They still retain a capacity of 331 mAh g−1 at 5 A g−1 after 4000 cycles. Moreover; the system operates well over a wide temperature range (−20–40 °C). It keeps 92% and 87% capacity retention rates after 1500 cycles at the temperatures of −20 °C and 0 °C; respectively.

Keywords:

ammonium vanadate

aqueous zinc ion batteries

cerium doping

interlayer spacing

ion transfer efficiency

Structural optimization of VO2/NH4V4O10 cathode materials for high-performance wide-temperature zinc-ion batteries

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