A chemically bonded CoNiO2 nanoparticles/MXene composite as anode for sodium-ion batteries

Abstract CoNiO 2 /MXene composite is successfully fabricated by a facile hydrothermal method combined with an annealing treatment. The CoNiO 2 nanoparticles anchor on MXene evenly form a rough multilayer structure, which can promote Na + transmission and relieve volume expansion during charge/discharge cycling. The CoNiO 2 /MXene multilayer structure composite as anode material for sodium-ion batteries delivers a high discharge capacity of 223 mA h g −1 at 100 mA g −1 and displays outstanding rate performance of 188 mA h g −1 at 300 mA g −1 .