MnSe/Co0.85Se/N‐CNFs as Binder‐Free Anodes for Sodium/Potassium‐Ion Batteries

Binder-free anodes: The long-cycle performance test showed that the MnSe/Co_0.85Se/N-CNFs electrode had a discharge capacity of 262.3 mAh g⁻¹ after 700 cycles at 1 A g⁻¹, which was higher than those of MnSe/N-CNFs and Co_0.85Se/N-CNFs (217.3 and 163.0 mAh g⁻¹) and indicated that MnSe/Co_0.85Se/N-CNFs electrode was suitable for long-life SIB anodes.

Abstract

MnSe and Co_0.85Se embedded in nitrogen-doped carbon nanofibers (MnSe/Co_0.85Se/N-CNFs) were synthesized by electrospinning and high-temperature calcination, and evaluated for the first time as sodium/potassium-ion battery anode material via constant current charge/discharge, cyclic voltammetry, electrochemical impedance spectroscopy.Ex-situ XRD revealed the potassium storage mechanism of MnSe/Co_0.85Se/N-CNFs, indicating that its capacity was mainly provided by the conversion reaction. Compared with MnSe/N-CNFs and Co_0.85Se/N-CNFs, the reversible capacity and cycling performance of MnSe/Co_0.85Se/N-CNFs were significantly improved due to the synergistic effect of bimetals. The MnSe/Co_0.85Se/N-CNFs electrode showed a charging capacity of 262.3 mAh g⁻¹ after 700 cycles at 1 A g⁻¹ in Na-ion batteries and a discharge capacity of 183.4 mAh g⁻¹ after 400 cycles at 0.1 A g⁻¹ in K-ion batteries, The results showed that binder-free binary metal MnSe/Co_0.85Se/N-CNFs have a certain development prospect as anode for sodium/potassium-ion batteries.

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