Novel Lamellar Se4P4/Graphene Hybrid Anode Stimulated Durable Potassium Storage

A facile fabricating tactic of high-energy ball milling coupled with cold quenching is adopted to design an amorphous Se4P4/graphene (Se4P4/G) hybrid anode for potassium ion batteries (PIBs). Benefiting from the promoted electron transfer and effective volume constraint caused by the graphene matrix, the novel Se4P4/G anode realized a prominent K-storage and long-time durability, such as a high initial capacity of 931.23/870.3 mAh g-1 at 50 mAh g-1, and sustainable capacity of 296.67/293.33 mAh g-1 at 1 A g-1 for 1800 cycles. DFT theoretical calculation revealed that the Se4P4/G interface could facilitate the electron transfer and reduce the band gap, which boosted the potassium storage. The Se4P4/G with high efficient storage and long-term durability would be one of the attractive anode materials for PIBs, and ongoing efforts are currently directed to commercialize scientific research, which provides a new idea to yield the high-power potassium phosphide for PIBs in the future.

Automated summary

A facile fabrication method of amorphous Se4P4/graphene (Se4P4/G) hybrid anode for potassium ion batteries (PIBs) is developed using high-energy ball milling coupled with cold quenching. The Se4P4/G anode with promoted electron transfer and effective volume constraint by the graphene matrix exhibits outstanding K-storage performance and long-time durability. The Se4P4/G interface facilitates electron transfer and reduces the band gap, boosting the potassium storage capacity. This research provides a new idea to produce high-power potassium phosphide for PIBs in the future.