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Multi-level phase change composite material and preparation method and application thereof

A phase change composite material and a phase change material technology, which are applied in the field of multi-level phase change composite materials and their preparation, can solve limited problems, and achieve the effects of improving low temperature resistance, enhanced thermal conductivity, and high load rate.

Active Publication Date: 2021-11-16
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most current phase change temperature control research focuses on the heat dissipation process of the battery, and the use of phase change materials to improve the low temperature resistance of the battery is very limited.

Method used

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  • Multi-level phase change composite material and preparation method and application thereof
  • Multi-level phase change composite material and preparation method and application thereof
  • Multi-level phase change composite material and preparation method and application thereof

Examples

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preparation example Construction

[0036] In order to solve the above problems, combined with figure 1 As shown, the embodiment of the present invention provides a method for preparing a multi-level phase change composite material, comprising the following steps:

[0037] S1. Disperse ferric chloride hexahydrate and trimesic acid in water, stir evenly to obtain a mixed solution, place the mixed solution in a reactor for hydrothermal reaction, and obtain a solid product organometallic framework MIL-100(Fe), and The solid product is subjected to high-temperature carbonization treatment to obtain MOF-based carbide MOF-C;

[0038] S2. The graphene oxide is formulated into a water-based dispersion, and MOF-based carbide and a crosslinking agent are added, hydrothermally synthesized and freeze-dried to obtain an airgel carrier;

[0039] S3, heating and melting calcium chloride hexahydrate and adding a nucleating agent to obtain a variety of phase change materials with different freezing points;

[0040] S4. Immerse...

Embodiment 1

[0060] This embodiment provides a method for preparing a multi-level phase change composite material, comprising the following steps:

[0061] 1) Weigh 1mmol ferric chloride hexahydrate and 0.66mmol trimesic acid into 20mL deionized water and stir magnetically at room temperature for 10min, dissolve completely to obtain an orange-yellow clear liquid; place the resulting mixture solution in 50mL polytetrafluoroethylene In a lined reaction kettle, heat at 120°C for 72h for hydrothermal reaction to obtain an orange-yellow solid precipitate; treat the solid precipitate at 500°C in a nitrogen atmosphere for 1h to obtain black MOF-C powder;

[0062] 2) Weigh GO to prepare 5 mL of aqueous dispersions with different concentrations, add 10 mg of MOF-C powder and 20 μL of cross-linking agent EDA, heat at 180 °C for 12 h for hydrothermal synthesis, and obtain MOF-based carbide / graphite oxide after freeze-drying ene hybrid airgel carrier;

[0063] 3) Weigh a certain amount of calcium chl...

Embodiment 2

[0069] This embodiment provides a method for preparing a multi-level phase change composite material, the difference from Embodiment 1 is:

[0070] In step 1), the solid precipitate was treated in a nitrogen atmosphere at 600°C for 30 minutes to obtain black MOF-C powder;

[0071] All the other steps and parameters are the same as in Example 1.

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Abstract

The invention provides a multi-level phase change composite material and a preparation method and application thereof.The preparation method adopts a step-by-step self-assembly method and comprises the steps that firstly, an organic metal frame MIL-100 (Fe) is synthesized through a hydrothermal method, high-temperature roasting treatment is conducted, and a carbide MOF-C is prepared; MOF-C and graphene oxide are mixed to form a solution, hydrothermal synthesis is performed and freeze-drying is performed to form an aerogel carrier; a phase-change material calcium chloride hexahydrate is loaded by adopting vacuum impregnation, the freezing point of each gradient phase-change layer is adjusted by changing the addition amount of a nucleating agent strontium chloride hexahydrate, and finally the phase-change layers with different freezing points are combined into the multi-level phase-change composite material through an adhesive. The multi-level composite phase change material provided by the invention can efficiently store waste heat of the battery, and can controllably release the stored heat when the environment temperature is reduced to heat the battery, so that the low-temperature resistance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of thermal management of lithium batteries, in particular to a multi-level phase change composite material and its preparation method and application. Background technique [0002] Usually, the performance of lithium batteries is best when the operating temperature is controlled at 20°C-45°C. Under low temperature conditions, due to the decrease in the conductivity of the electrolyte, insufficient activation charge transfer energy, and increased resistance, the battery performance will be severely reduced. Traditionally, heating strategies such as hot air convection heating and alternating current heating are used to improve the low-temperature performance of batteries, but this requires a lot of extra energy. Some scholars have also tried to improve the internal materials of the battery, but have not yet found suitable commercial electrode or electrolyte materials. Through the research, it is found that us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06H01M10/653H01M10/6569
CPCC09K5/063H01M10/653H01M10/6569Y02E60/10
Inventor 汪淼喻发全
Owner WUHAN INSTITUTE OF TECHNOLOGY
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