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Single crystalline fork-like potassium vanadate (K 2 V 8 O 21 ) has been successfully prepared by electrospinning method with a subsequent annealing process. The as-obtained K 2 V 8 O 21  forks show a unique layer-by-layer stacked structure. When used as cathode materials for lithium-ion batteries, the as-prepared fork-like materials exhibit high specific discharge capacity and excellent cyclic stability. High specific discharge capacities of 200.2 and 131.5 mA h g −1  can be delivered at the current densities of 50 and 500 mA g −1 , respectively. Furthermore, the K 2 V 8 O 21  electrode exhibits excellent long-term cycling stability which maintains a capacity of 108.3 mA h g −1  after 300 cycles at 500 mA g −1  with a fading rate of only 0.043% per cycle. The results demonstrate their potential applications in next-generation high-performance lithium-ion batteries.

Electrospun Single Crystalline Fork-Like K2V8O21 as High-Performance Cathode Materials for Lithium-Ion Batteries