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Porous graphite base phase change energy storage composite material and its preparing method

A technology of porous graphite and composite materials, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems affecting the efficiency of energy storage and energy release, low energy storage and low energy storage of composite materials, etc.

Inactive Publication Date: 2005-03-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Poor thermal conductivity: As the thermal conductivity of the currently used matrix materials is generally small, the thermal conductivity and heat transfer performance of the phase change energy storage composite material during the phase change process is very poor, which affects its energy storage-energy release performance. efficiency
[0005] (2) Low energy storage: due to the small porosity of porous media, the composite material contains less phase change materials, resulting in low energy storage of the composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 30 grams of flake graphite with a fineness of 80 mesh and a carbon content of 90%, 300 grams of sulfuric acid with a concentration of 98% and 20 grams of potassium permanganate, put them into a glass container and stir and mix them. The glass container was then placed in a constant temperature water bath, and the temperature of the water bath was set at 45°C. The mixture was continuously stirred at 300 RPM. After the intercalation, the water washing procedure was carried out. Filter the mixture with a 200-mesh stainless steel mesh, then put the filter residue into a beaker, add water to cover the mixture, fully stir with a glass rod, and then filter with a 200-mesh stainless steel mesh. Repeat the wash twice. Measure the pH of the last stirred solution to be 2. The final filtered residue is placed in a glass tray and placed in an oven to dry. The oven temperature is 60° C., and the drying time is 10 hours. Take 5 grams of the dried graphite intercalation, put ...

Embodiment 2

[0021] Take 30 grams of flake graphite with a fineness of 50 mesh and a carbon content of 94%, 300 grams of sulfuric acid with a concentration of 98% and 20 grams of potassium permanganate, put them into a glass container and stir and mix them. The glass container was then placed in a constant temperature water bath, and the temperature of the water bath was set at 45°C. The mixture was continuously stirred at 300 RPM. After the intercalation, the water washing procedure was carried out. Filter the mixture with a 200-mesh stainless steel mesh, then put the filter residue into a beaker, add water to cover the mixture, fully stir with a glass rod, and then filter with a 200-mesh stainless steel mesh. Repeat wash 3 times. Measure the pH of the last stirred liquor to be 4. The final filtered residue is placed in a glass tray and placed in an oven to dry. The oven temperature is 60° C., and the drying time is 10 hours. Take 5 grams of the dried graphite intercalation, put it i...

Embodiment 3

[0023] Take 30 grams of flake graphite with a fineness of 80 mesh and a carbon content of 90%, 300 grams of sulfuric acid with a concentration of 98% and 20 grams of potassium permanganate, put them into a glass container and stir and mix them. Then the glass container was put into a constant temperature water bath, and the temperature of the water bath was set at 60°C. The mixture was continuously stirred at 300 RPM. After the intercalation, the water washing procedure was carried out. Filter the mixture with a 200-mesh stainless steel mesh, then put the filter residue into a beaker, add water to cover the mixture, fully stir with a glass rod, and then filter with a 200-mesh stainless steel mesh. Repeat wash 4 times. Measure the pH of the last stirred liquor to be 6. The final filtered residue is placed in a glass tray and placed in an oven to dry. The oven temperature is 60° C., and the drying time is 10 hours. Take 5 grams of the dried graphite intercalation, put it in...

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Abstract

The present invention relates to one kind of composite porous graphite base phase change energy-storing material and its preparation process. The composite phase change energy-storing material has porous graphite as base material and is prepared through soaking organic phase change material. The porous graphite is prepared with natural flake graphite and through intercalation, swelling and compression. The organic phase change material is crystallized fatty acid, alkane, ester or their mixture. Compared with available composite phase change energy-storing material, the composite porous graphite base phase change energy-storing material has the advantages of high heat conducting efficiency, great energy storing amount, etc. The present invention can promote the application of phase change energy-storing material in various application fields.

Description

technical field [0001] The invention belongs to the field of energy storage composite materials, and in particular relates to a porous graphite-based phase-change energy storage composite material and a preparation method thereof. Background technique [0002] Storing energy to meet energy demand at other times or places is of great value in eliminating the uncoordinated contradiction between energy supply and demand, improving energy efficiency and utilizing renewable energy. Utilizing the characteristics of energy absorption and energy release during the phase transition process of matter to realize energy storage and utilization is one of the active directions in many fields such as energy, materials, aerospace, textiles, electric power, medical instruments, and construction in recent years. Phase change energy storage has the advantages of high energy storage density, easy control of energy storage temperature and a wide range of options. At present, it has entered the s...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 张东
Owner TONGJI UNIV
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