Preparation method of carbon foam with high electrochemical performances

Abstract

The invention relates to a preparation method of carbon foam with high electrochemical performances, comprising the following steps of: firstly, weighing phenol formaldehyde, vanadate, surface active agent, sodium hydroxide and solvent according to mass ratio of 1:(0.6-4):(0.01-0.5):(1-20):(0.01-0.5):100, mixing uniformly and obtaining precursor solution of the carbon foam; putting the obtained solution into an environment with the temperature of 15 DEG C-60 DEG C to lead the solvent to be completely volatilized, and obtaining precursor of solid carbon foam; and solidifying the precursor of the solid carbon foam for 1 hour-24 hours at the temperature of 100 DEG C-200 DEG C, then rising the temperature to be 600 DEG C-1400 DEG C at the temperature rising speed of 1 DEG C / min-60 DEG C / min under the inert atmosphere, carbonizing for 0.5 hour-10 hours, and obtaining the carbon foam with high electrochemical performances. In the preparation method, the technology is simple, the quality is stable, vanadate introduced when the precursor solution of the carbon foam is prepared is converted into sodium vanadate nanocrystalline with a stable layer structure in the process of carbonization, and the obtained sodium vanadate nanocrystalline is embedded into a carbon foam skeleton uniformly. Compared with the existing carbon foam, the prepared carbon foam has the electrochemical performances such as high mass specific capacitance, good charging and discharging circulation and the like, and can be effectively applied in the fields such as electrode materials of electrochemical capacitorsand the like.

Description

technical field

[0001] The invention relates to a method for preparing carbon foam with high electrochemical performance, in particular embedding sodium vanadate nanocrystals in the framework of carbon foam to improve the electrochemical performance of carbon foam. The electrochemical performance of the carbon foam prepared by the method of the invention is obviously improved. Background technique

[0002] Carbon foam is a solid material with low density, high porosity and high specific surface area with network structure. Carbon foam reported at home and abroad has the characteristics of high specific surface area, good corrosion resistance, thermal stability and flexibility, and highly open pore structure, which is a very promising electrode material. The title of the invention is "Carbon Foam and Its Preparation Method" (Chinese Invention Patent, Patent No.: ZL 01816023.9) discloses a method for the preparation of carbon foam, and describes the introduction of this carbo...