Super capacitor-used composite material and preparation method thereof

Abstract

The invention relates to a super capacitor-used composite material and a preparation method thereof. With coal as a raw material, a coal sample is crushed and screened to powder with a certain particle size, temperature of the powder rises to 600 to 800 DEG C at a temperature rise rate of 25 to 35 DEG C/min, carbonization is then carried out to obtain a carbonized material, temperature of the carbonized material rises to 800 to 1100 DEG C at a temperature rise rate of 25 to 35 DEG C/min, an activated gas is fed, 3 to 5 h of activation is carried out, and cooling to room temperature is carried out; after the material is washed by water for 3 to 6 times, acid cleaning is firstly carried out, and distilled water is then used for washing until PH is near to 7; and in a certain condition, drying to a constant weight is carried out, and an activated carbon composite material is obtained. The activated carbon material prepared in the invention is an electrode material, the activated carbon material has a large specific surface area, large total pore volume and high mesopore ratio, the specific capacitance and the charge and discharge cycle performance of the super capacitor are improved, and requirements on the high specific capacitance and the excellent large current performance by the super capacitor are met.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a composite material for a supercapacitor and a preparation method thereof. Background technique [0002] A supercapacitor is an energy storage element between a battery and a traditional capacitor based on an electrochemical process at the electrode / electrolyte interface. Its capacity comes from electric double layer capacitance and Faraday quasi-capacitance. The battery has the characteristics of high energy density, excellent continuous and rapid charge and discharge performance, long cycle life, high power density, wide operating temperature range, and environmental friendliness. Supercapacitors have broad application prospects in many fields, such as mobile communications, information technology, aerospace, national defense technology, civilian fields or used alone to adjust electric loads, store electricity, or with fuel cells, solar cells, wind power, internal ...

AI Technical Summary

Problems solved by technology

It is generally believed that the specific surface area of ​​the electrode material is linearly related to the capacitance of the electric double layer capacitor to a certain extent. Therefore, in order to improve the capacitance performance of the product, many manufacturers choose activated carbon powder with small particle size and pore diameter. Such powder is due to The specific surface area is large, and the prepared electric double layer capacitor has a large specific capacitance and a high energy density supercapacitor, but the energy storage performance of this electric double layer capacitor is still not comparable to other energy storage devices such as batteries and lithium batteries.

At the same time, because the carbon powder particles are too small, the internal resistance of the produced electric double layer capacitor is large, the charging and discharging time is slow, and the power density is low, which completely loses the advantages and characteristics of the super capacitor itself.