Excellent Electrochemical Performance of a Mesoporous Nickel Sulfide Anode for Na/K-Ion Batteries

Le résumé fourni par la source

Post-lithium-ion batteries (LIBs) have been widely studied owing to the extensive exploitation of lithium resources. Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are considered suitable alternatives to LIBs; however, the absence of an ideal anode material limits the practical applications of such post-LIBs. The present study demonstrates the application of mesoporous Ni 3 S 2 as an anode material for SIBs and PIBs as well as the advantages of using a porous electrode in a high ionic-conductivity, low-viscosity, ether-based electrolyte. The utilization of mesoporous Ni 3 S 2 as the anode material resulted in extraordinary rate and cycling performances. When SIBs were assembled using mesoporous Ni 3 S 2 as the anode material, capacities of 610 and 154 mAh g –1 were obtained at current densities of 0.2 and 100 A g –1, respectively. Long-term cycling stability, with an initial capacity of 307 mAh g –1 and a capacity decay of 0.0085% per cycle, was also observed over 5000 cycles at 50 A g –1 . Full cells assembled using Na 3 V 2 (PO 4 ) 3 and Ni 3 S 2 as cathode and anode materials, respectively, delivered exceptional rate and cycling performances. Long-term cycling stability, with a capacity decay of 0.034% per cycle, was obtained over 1500 cycles at 10 A g –1 . When PIBs were assembled using mesoporous Ni 3 S 2 as the anode material, capacities of 534 and 38 mAh g –1 were obtained at 1 and 100 A g –1, respectively. Long-term cycling stability, with an initial capacity of 411 mAh g –1 and a capacity decay of 0.047% per cycle, was observed over 1000 cycles at 10 A g –1 . Notably, the rate and cycling performances obtained in the present study are superior to those obtained in previous works on the use of Ni 3 S 2 as the anode material for SIBs and PIBs.

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