| abstract |
The invention provides a composite material, a preparation method and application thereof. The composite material is a core-shell structure in which a nano-carbon layer coats a single crystal H-Nb 2 O 5 , wherein the core is a single crystal H-Nb 2 O 5 particle, The longest dimension is 2-10 μm, and the shell is a nano-carbon layer with a thickness of 10-20 nm. The nano-carbon layer-coated single-crystal H-Nb 2 O 5 composite material obtained according to the preparation method of the present invention has a reversible capacity as high as 270 mAh/g; and the single-crystal H-Nb 2 O 5 has intrinsically high lithium ion diffusivity , the uniform nano - carbon layer improves the electronic conductivity of the material, and ensures the ultra - high rate charge-discharge capability and long-cycle stability of the material. Lithium precipitation does not occur under the current density, so the safety is good. |