Abstract
An ammonium vanadium bronze (NH4)0.5V2O5 (NVO) was synthesized via a hydrothermal route and investigated the Na-insertion/extraction process as a cathode for Na-ion batteries. The structural analysis confirms that the double-layered NVO in the micro-rods structure is formed by the double-sheet [VO6] with a large distance interlayer of 9.717 Å to be suitable for reversible Na-storage. The charge–discharge cycling performance delivers ∼160 mAh/g for long-term 200 cycles with structural stability. The ex-situ EXD at various Na-content states demonstrates the shrinkage/expansion of the interlayers during Na-migration, and the NH4+-ions play an essential role as the “pillar” of double-layered V2O5 to assure cycling stability. This work contributes to a high-capacity member of the V2O5 polymorph family in the context of Na-ion batteries.
Published Version
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