Sludge-based biomass carbon anode material with high specific capacity and application in sodium-ion batteries thereof

Abstract

The present invention discloses a sludge-based biomass carbon anode material with high specific capacity and its application in sodium-ion batteries, belonging to the field of sodium-ion battery anode materials. The preparation method of a sludge-based biomass carbon anode material provided by the present invention includes the following steps: mixing sludge powder with a weak acid solution, performing leaching treatment, and then conducting solid-liquid separation to obtain pretreated sludge; subjecting the pretreated sludge to pre-carbonization treatment under the protection of an inert atmosphere to obtain a pre-carbonized intermediate; mixing the pre-carbonized intermediate with an activator, performing an activation reaction to obtain activated porous carbon; and subjecting the activated porous carbon to high-temperature carbonization treatment under the protection of an inert atmosphere to obtain the sludge-based biomass carbon anode material. The present invention effectively solves the inherent problems of high ash content and low porosity of sludge carbon. The prepared sludge-based biomass carbon has expanded carbon interlayer spacing, high specific surface area, and a rich hierarchical pore structure.