Novel KTiO is successfully fabricated via a facile hydrothermal method combined with a subsequent annealing treatment and further evaluated as an anode material for potassium-ion batteries for the first time. This study may provide a broader vision into developing anode materials for potassium-ion batteries.

Novel KV(PO) and three-dimensional conductive network KV(PO)/C nanocomposites are successfully fabricated and further evaluated as cathode materials for potassium-ion batteries for the first time. The KV(PO)/C nanocomposite exhibits a high-potential platform of 3.6-3.9 V and a good capacity retention of at least 100 cycles. This work may provide new insight into developing cathode materials for potassium-ion batteries.

Novel nanocubic KTi(PO) was successfully fabricated via a facile hydrothermal method combined with a subsequent annealing treatment and further evaluated as an electrode material for potassium-ion batteries for the first time. For comparison, carbon-coated KTi(PO) obtained by a normal cane sugar-assisted method reveals improved electrochemical performances in potassium-ion batteries. This work may give a new insight into developing electrode materials for potassium-ion batteries.

Zn batteries have recently become of great interest as energy storage devices. However, their lifespan is limited by irreversible processes at the Zn anodes owing to side reactions and dendrite growth in a mild pH electrolyte. Herein, an artificial ZnF 2 layer on the Zn metal anode surface is developed to address these issues. Modeling results suggest that ZnF 2 can allow insertion of Zn 2+ and offers diffusion channels for the transport to/from the Zn anode via an interstitial diffusion mechanism. The artificial layer suppresses dendrite growth by guiding the Zn plating/stripping underneath the layer, thus enhancing the electrochemical performance of the anode as demonstrated by the Zn-ZnF 2 /MnO 2 full cell. The Zn anode with this artificial layer sustains long-term cycling (more than 700 h) at an areal capacity of 0.5 mAh cm −2 , and the Zn-ZnF 2 /MnO 2 full cells achieve a capacity retention of 89% after 3000 cycles.