CN-121573919-B - Alkali-activated cementing material for super capacitor and preparation method thereof

Abstract

The invention belongs to the technical field of concrete, and provides an alkali-activated cementing material for a super capacitor and a preparation method thereof, wherein the alkali-activated cementing material comprises, by weight, 4-5 parts of fly ash, 1-1.2 parts of slag and 2.5-3 parts of alkali-activated agent, and zeolite is formed in the alkali-activated cementing material after autoclaved curing. The alkali-activated cementing material prepared by the method takes industrial solid waste as a raw material, has the advantages of environmental protection and low cost, remarkably improves the cycling stability and electrochemical performance of the super capacitor by optimizing the formula and the process of the alkali-activated cementing material, realizes the energy storage function of a large amount of building materials, and fills the technical blank of preparing the energy storage device by replacing the cement-based material with the alkali-activated cementing material.

Inventors

• WANG ZHEN
• CHEN JIALE
• LIU QIAOLING
• Zhou Zaibo
• CAO ZHENYU
• ZHANG YICHEN
• ZHANG WENHAI

Assignees

• 山东建筑大学

Dates

Publication Date

20260508

Application Date

20260127

Claims (6)

1. 1. The alkali-activated cementing material for the super capacitor is characterized by comprising, by weight, 4-5 parts of fly ash, 1-1.2 parts of slag and 2.5-3 parts of alkali-activated agent; The alkali-activated cementing material is autoclaved and cured to form zeolite inside, and the zeolite has a regular pore structure; The alkali excitant consists of water, sodium silicate and sodium hydroxide, wherein the molar ratio of the sodium silicate to the sodium hydroxide is 1.55-1.65:1, the modulus of the sodium silicate is 0.5-0.55, and the concentration of the sodium hydroxide is 4.0-4.5 mol/L; The fly ash is I-grade fly ash; The autoclaved curing condition is that after curing for 4-6 hours at 40 ℃, curing for 10-12 hours at 0.2MPa-0.5MPa and 120-150 ℃.
2. 2. The alkali-activated gelling material for supercapacitors as claimed in claim 1, wherein the liquid-solid ratio of the alkali-activated gelling material is between 0.10 and 0.20.
3. 3. The alkali-activated cementitious material for a supercapacitor of claim 1, wherein said slag is S105 grade slag.
4. 4. A method for preparing the alkali-activated gelling material for a supercapacitor according to any one of claims 1 to 3, comprising: preparing an alkali excitant; uniformly mixing the fly ash and slag to obtain a dry material; uniformly mixing the dry material with an alkali-activated agent to obtain an alkali-activated cementing material; And pouring the alkali-activated cementing material into a mold, and performing autoclaved curing and standard curing to obtain the alkali-activated cementing material for the super capacitor.
5. 5. The method for producing an alkali-activated gel material for a supercapacitor according to claim 4, wherein the dry material is mixed with an alkali-activator by stirring.
6. 6. The method for preparing an alkali-activated gel material for a supercapacitor according to claim 5, wherein the stirring speed is 140-160r/min.

Description

Alkali-activated cementing material for super capacitor and preparation method thereof Technical Field The invention belongs to the technical field of concrete, and relates to an alkali-activated cementing material for a super capacitor and a preparation method thereof. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. With the transformation of global energy structures to renewable energy sources, solar energy, wind energy and other energy sources are increasingly used. The instability of these energy sources requires efficient energy storage technology to balance supply and demand. The concrete super capacitor is used as a novel energy storage technology, and can convert a large amount of buildings or infrastructure into a direct energy storage device, so that the efficient storage and utilization of energy sources are realized. However, the gel phase of ordinary concrete is mainly crystalline hydrated calcium silicate, and its electron conduction mainly depends on physical contact between aggregate and hydration product, and the conductive path is discontinuous. The alkali-activated cementing material is subjected to alkali excitation to form an amorphous aluminosilicate three-dimensional network, silicon oxygen tetrahedron and aluminum oxygen tetrahedron are in disordered connection in the structure to generate a large number of oxygen vacancies and movable alkali metal cations, the cations can freely migrate in a channel to form an ion conducting path, the amorphous structure reduces an electron conducting barrier brought by a crystalline phase, and finally the volume resistivity of the alkali-activated cementing material is reduced, but the ion transmission efficiency and the storage performance of a supercapacitor prepared by the existing alkali-activated cementing material still need to be improved. The research discloses a method for preparing the fly ash zeolite ceramsite under autoclaved curing, wherein the fly ash zeolite ceramsite is used for copper ion adsorption, but the problem of preparing the alkali-activated cementing material for the super capacitor is not related. Therefore, development of an alkali-activated gelling material for a supercapacitor having both superior mechanical strength and electrochemical properties is needed. Disclosure of Invention In order to solve the problems, the invention provides the alkali-activated cementing material for the super capacitor and the preparation method thereof, and the invention adopts autoclaved curing to induce amorphous silica-alumina gel in the slag-fly ash-based alkali-activated cementing material to crystallize to generate a zeolite phase, and the formed zeolite has a regular pore structure, so that the diffusion distance of sodium ions can be obviously shortened, the ion exchange rate constant is improved by 1-2 orders of magnitude, the adsorption-desorption process is completed in millisecond, the rapid charge-discharge characteristic of the super capacitor is effectively matched, the adsorption capacity to sodium ions is obviously improved, and the ion storage capacity and the transmission efficiency of the super capacitor are further optimized. In order to achieve the above purpose, the present invention adopts the following technical scheme: In a first aspect of the invention, an alkali-activated gelling material for a supercapacitor is provided, The alkali-activated cementing material comprises, by weight, 4-5 parts of fly ash, 1-1.2 parts of slag and 2.5-3 parts of alkali-activated agent; and the alkali-activated cementing material is autoclaved and cured to form zeolite inside. In a second aspect of the present invention, there is provided a method for preparing an alkali-activated gelling material for a supercapacitor, comprising: preparing an alkali excitant; uniformly mixing the fly ash and slag to obtain a dry material; uniformly mixing the dry material with an alkali-activated agent to obtain an alkali-activated cementing material; And pouring the alkali-activated cementing material into a mold, and performing autoclaved curing and standard curing to obtain the alkali-activated cementing material. The beneficial effects of the invention are that (1) The fly ash and slag used in the invention are all derived from solid waste materials in industrial production, and the waste materials are reused as building materials in new industrial production, so that not only can the energy consumption be reduced and the pollution to the environment be reduced, but also the material cost of the supercapacitor can be reduced. (2) According to the invention, the fly ash and the sodium hydroxide solution are used as raw materials to prepare the alkali-activated concrete, so that