Preparation and applications of novel porous carbon material with high energy storage performance

Abstract

The invention discloses a novel porous carbon material with high energy storage performance, wherein the material is derived and prepared from lees, lees is subjected to low-temperature pre-carbonization to obtain a carbon precursor, and then the carbon precursor and an alkaline inorganic matter are directly mixed and calcined to obtain the lees-derived porous carbon material, wherein the obtainedmaterial is honeycomb-shaped and has a specific surface area of 1000-4000 m<2> / g, the fermentation method of the lees is whole-process semi-solid semi-liquid state fermentation, and the lees is Sanhua wine lees. The preparation method comprises: 1) preparation of a carbon precursor: drying, grinding, and carrying out low-temperature pre-carbonization to prepare the carbon precursor; and 2) preparation of a lees-derived porous carbon material: grinding, mixing, calcining, soaking, washing, filtering, drying, and grinding to prepare the lees-derived porous carbon material.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to the preparation and application of a novel porous carbon material with high energy storage performance. Background technique [0002] With the rapid development of the world and the increasing demand for energy, it is imminent to find a green and environmentally friendly energy storage device to store renewable energy and realize energy upgrading. Supercapacitor, also known as electrochemical capacitor, is a new type of electrochemical energy conversion and energy storage device, which has the characteristics of high power density, long cycle life, and wide operating temperature range. In recent years, supercapacitors have made significant progress in both theoretical research and practical applications, but they still face the problems of insufficient energy density and high production costs. Electrode materials are the core components of supercapacitors and play a vita...

AI Technical Summary

Problems solved by technology

The preparation method of this method has confirmed the advantages of the above-mentioned biomass materials, but there are the following technical problems: 1. The deficiencies in the material itself, specifically, the biomass material used in this method is glutinous rice, because glutinous rice does not have specific microscopic Morphology, and without special treatment, the specific surface area of ​​the prepared carbon material is only 1371.5m 2 g -1 , leading to lower specific capacitance performance; 2. As a food crop, glutinous rice itself has high economic value, the market price exceeds 5 yuan / 500 g, and it involves national food security issues, so it is not suitable to use "waste" biomass materials to prepare Carbon materials, realizing the characteristics of "turning waste into treasure"

The problems of this method are: 1. When the additional pore-forming agent is added in large-scale production, it is very easy to produce insufficient or excessive pore-forming, resulting in the collapse of the structure, greatly increasing the difficulty of process control, and seriously affecting the yield of the product. ; 2. It is also because of K 2 CO 3 The etching of the carbon material by the pore forming agent leads to a decrease in the structural stability of the carbon material. This adverse effect is reflected in the poor rate performance and cycle performance of the material when used as a supercapacitor

In addition, the amount of elements contained in the leaf itself is small, and it is difficult to generate a pseudocapacitive reaction on the surface of the material, resulting in poor performance.

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