Transition metal oxide-coated biomass carbon material as well as preparation method and application thereof

The invention discloses a transition metal oxide-coated biomass carbon material and a preparation method and application thereof. The preparation method comprises the steps that biomass, a pore forming agent and water are mixed and subjected to standing treatment, insoluble substances are collected and then calcined, and a carbon material intermediate is obtained; mixing the carbon material intermediate with a modifier, and calcining to obtain biomass carbon; mixing the biomass carbon, soluble transition metal salt and water, and performing hydrothermal reaction to obtain an intermediate product; and calcining the intermediate product to obtain the transition metal oxide-coated biomass carbon material. In the invention, the proportion of the carbon material intermediate to the modifier has great influence on the morphology and electrochemical properties of the biomass carbon, and the appropriate proportion is beneficial to increase of active sites for lithium ion storage, electrolyte infiltration, lithium ion