Fabrication of NiMn 2 O 4 /C hollow spheres with a trilaminar shell structure as an anode material for sodium-ion batteries.

NiMn 2 O 4 /C hollow spheres with sandwich-structured shells were fabricated by a hydrothermal method. Leveraging the mesoporous design of the carbon hollow spheres, NiMn 2 O 4 nanosheets were evenly dispersed on both the inner and outer surfaces of the carbon shells. NiMn 2 O 4 /C demonstrated excellent rate capability and prolonged cycling durability for sodium ion storage.