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Phase-change energy-storage material

A phase-change energy storage material and energy storage technology, applied in the field of energy storage materials, can solve the problems of reducing the cycle life of materials, easy overcooling of inorganic salt hydrates, and restrictions on practical applications, and achieve improved cycle stability and cycle stability Excellent performance and improved thermal conductivity

Inactive Publication Date: 2014-03-26
PIONEER ENERGY JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, inorganic salt hydrate has the disadvantages of easy supercooling and phase separation, which makes the material easy to precipitate, reduces the cycle life of the material, and seriously restricts the practical application. there is a need to improve

Method used

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  • Phase-change energy-storage material

Examples

Experimental program
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Effect test

experiment example 1

[0027] Weigh 40g of lithium nitrate trihydrate, 3g of carbon fiber, 4g of starch, and 6g of barium sulfate in a reaction vessel, stir for 10 minutes to mix evenly, place in a water bath at 40°C, and heat the water bath until lithium nitrate trihydrate is completely melted. After melting, use The stirrer stirred for 20 minutes until the components were evenly mixed, and the phase change energy storage material was obtained. Conduct cycle stability experiments on phase change energy storage materials, and conduct DSC tests and thermal conductivity tests. The sample was cycled 1000 times, the enthalpy value was 240J / g, and the thermal conductivity was 2.2 times that of the unreinforced material.

experiment example 2

[0029] Weigh 46g of sodium acetate trihydrate, 1g of expanded graphite, 2g of starch, and 1g of disodium hydrogen phosphate dodecahydrate in a reaction vessel, stir for 10 minutes to mix evenly, heat in a water bath at 80°C until sodium acetate trihydrate is completely melted, After the sample is melted, mix the components with a stirrer for 20 minutes until the sample is evenly mixed, and then the phase change energy storage material is obtained. Conduct cycle stability experiments, DSC tests, and thermal conductivity tests on phase change energy storage materials. For its cycle stability diagram, see figure 1 , 3000 cycles, still no attenuation; thermal conductivity is twice that of phase-change energy storage materials without reinforcement materials.

experiment example 3

[0031] Weigh 49g of sodium acetate trihydrate, 0.25g of nano-copper powder, 0.5g of gelatin, and 0.25g of sodium pyrophosphate in a reaction vessel, stir for 10 minutes to mix evenly, and heat in a water bath at 80°C until the sample is completely melted. , fully stirred for 20 minutes until the samples were evenly mixed, and the phase change energy storage material was obtained. Conduct cycle stability experiments on phase change energy storage materials, and conduct DSC tests and thermal conductivity tests. After 2500 cycles, the enthalpy value is 230J / g; the thermal conductivity is 2.5 times that of the unreinforced material.

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Abstract

The invention relates to a phase-change energy-storage material which comprises the following components in percentage by mass: 75%-99% of an energy storage main body material, 0.1%-10% of a thickening agent, 0.2%-15% of a nucleating agent and 0.01%-8% of a reinforcing material, wherein the energy storage main body material comprises crystal water and salt; the thickening agent comprises one or more of an inorganic thickening agent, fibers, polyacrylates, polyurethanes and a natural polymer thickening agent; the nucleating agent comprises one or more of sodium pyrophosphate, sodium phosphate decahydrate, calcium sulfate dihydrate, potassium sulfate, potassium borate, barium hydroxide octahydrate, sodium phosphate dibasic dodecahydrate and sodium sulfate; the reinforcing material comprises one or more of metal and metal oxide powder, carbon materials, nanoparticles and foam materials. By selecting proper materials and ratio, the supercooling degree and the phase separation phenomenon are reduced and good circulating stability is achieved; especially the reinforcing material is added into a system to form a heat-conducting network so as to improve the heat conductivity of the material by more than two times.

Description

[technical field] [0001] The invention relates to the technical field of energy storage materials, in particular to a phase change energy storage material. [Background technique] [0002] With the increasingly prominent problems of energy shortage and environmental pollution, people pay more and more attention to the utilization of new energy and the improvement of energy utilization. Energy storage technology, as an important method to solve the energy supply-demand imbalance problem, is favored by domestic and foreign enterprises and related research institutions. Among them, thermal energy storage based on phase change energy storage materials is one of the most widely used energy storage technologies. [0003] Phase change energy storage refers to the storage and release of energy by using phase change materials to absorb or release heat when the phase changes. Compared with sensible heat storage, it has the advantages of high energy storage density and constant tempera...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 刘硕刘承梅王长君
Owner PIONEER ENERGY JIANGSU
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