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

CoNiO2/MXene composite is successfully fabricated by a facile hydrothermal method combined with an annealing treatment. The CoNiO2 nanoparticles anchor on MXene evenly form a rough multilayer structure, which can promote Na+ transmission and relieve volume expansion during charge/discharge cycling. The CoNiO2/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.