Morphology-controllable CoP arrays in situ grown on carbon fiber cloth as a highly efficient free-standing interlayer for Li-SeS₂ batteries

In order to inhibit the shuttle effect and promote the electrochemical performance of Li-SeS₂ batteries, the morphology-controllable CoP growing on carbon fiber cloth, labelled as CoP-X@CFC (X=S, R, RC), is designed and prepared as free-standing interlayers for Li-SeS₂ batteries. With sufficient NH₄F in the synthesis, the generated bundled CoP-RC rods are robust and uniformly attached on CFC. The CoP-RC@CFC interlayer possesses a greater specific surface area for chemisorption and enhances conversion of LiPSs/LiPSes to inhibit the shuttle. Therefore, the CoP-RC@CFC based coin cell exhibits good cycling and rate performance, delivering 1070.2, 948.7, 845.0, 723.8 and 646.7 mAh g⁻¹ when cycled at 0.2, 0.5, 1.0, 2.0 and 3.0 A g⁻¹, respectively. Such outstanding performance benefits from the alleviation of LiPSs/LiPSes shuttle since the CoP-RC@CFC free-standing interlayer confines LiPSs/LiPSes in the cathode zone. This work provides a feasible and effective method for applying morphology-controllable CoP as the free-standing interlayer in Li-SeS₂ batteries.