Pyroelectric cement-based structural electrolyte, cement-based pyroelectric capacitor and method of preparation

By incorporating water-soluble polymers and two-dimensional MXene materials into cement paste, a ternary composite system was constructed, which solved the problem of the single function of cement-based materials in thermoelectric conversion and electrical energy storage. This enabled the conversion of thermal energy into electrical energy and the real-time storage of electrical energy, thereby improving the stability and performance of the structure.

CN122010454BActive Publication Date: 2026-06-09TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TONGJI UNIV
Filing Date
2026-04-10
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing cement-based materials have limited functionality in thermoelectric conversion and energy storage, failing to achieve both efficient conversion and real-time storage. Furthermore, the high carbon content in these materials leads to insufficient structural stability.

Method used

By incorporating low amounts of water-soluble polymers and two-dimensional MXene materials into cement paste, a ternary composite system of water-soluble polymer-two-dimensional MXene-ion donor solution is constructed. This system adjusts the pore distribution and improves the Seebeck coefficient and ionic conductivity. Combined with a double-layer capacitor storage electrode, it achieves integrated thermoelectric conversion and electrical energy storage.

Benefits of technology

The thermoelectric and electrochemical properties of the thermoelectric cement-based structural electrolyte have been improved, realizing the conversion of thermal energy into electrical energy and the real-time storage of electrical energy. It has the potential to be used as a building load-bearing structural material, with a maximum area specific capacitance of 1477.3 mF/cm2 and an energy density of 0.207 mWh/cm2.

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Abstract

The application discloses a thermoelectric cement-based structure electrolyte, a cement-based thermal charging capacitor and a preparation method. The thermoelectric cement-based structure electrolyte comprises a cement base, the cement base is formed by hardening of a cement paste uniformly mixed with a water-soluble polymer and a two-dimensional MXene material; pores in the cement base are filled with an ion donor solution; the mass of the water-soluble polymer is 5% to 10% of the mass of the cement; and the mass of the two-dimensional MXene material is 0.01% to 0.1% of the mass of the cement. By mixing a low amount of the water-soluble polymer and the two-dimensional MXene material in the cement paste, the application not only adjusts the pore distribution of the cement base, maintains and even improves the mechanical properties of the thermoelectric cement-based structure electrolyte, but also obtains high Seebeck coefficients and ion conductivities in a ternary composite system. The cement-based thermal charging capacitor uses the thermoelectric cement-based structure electrolyte as an electrolyte layer and composites a double electric layer capacitor storage electrode, so that the cement-based thermal charging capacitor realizes good thermal power generation and storage integration under the action of a temperature difference.
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