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Bimetallic selenides are considered to be the promising high-capacity anode materials for potassium ion batteries (PIBs). However, the dramatic volume fluctuation of K +  ions and pulverization during cycling still limit their practical application in PIBs. Herein, the nitrogen, phosphorus, and sulfur tri-doped carbon (SPNC)-coated bimetallic NiCo 2 Se 4  needle arrays grown on carbon cloth (NiCo 2 Se 4 ⊂SPNC/CC) prepared as a binder-free anode for PIBs. The polyphosphazene (PSZ) was used as ingenious heteroatoms doping carbon source. The coated SPNC layer derived from the PSZ on the surfaces of NiCo 2 Se 4  needle arrays not only effectively alleviate the volume expansion of NiCo 2 Se 4  but also provide abundant active sites for the storage of K +  ions. As the PIB anode, the NiCo 2 Se 4 ⊂SPNC/CC could deliver a high reversible capacity of 880.9 mA h g −1  at a current density of 0.1 A g −1 . After 500 cycles, the NiCo 2 Se 4 ⊂SPNC/CC anode still maintains a high reversible capacity of 268.1 mA h·g −1  at a current density of 0.5 A g −1 .

frontiers in materials

Nitrogen, Phosphorus, and Sulfur Tri-doped Carbon A Coated NiCo2Se4 Needle Arrays Grown on Carbon Cloth as Binder-free Anode for Potassium-Ion Batteries