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A kind of multi-level phase change composite material and its preparation method and application

A phase change composite material and a phase change material technology, applied in the field of multi-level phase change composite materials and their preparation, can solve problems such as limitation, and achieve the effects of improving low temperature resistance, efficient storage, and high load rate

Active Publication Date: 2022-07-19
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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  • A kind of multi-level phase change composite material and its preparation method and application
  • A kind of multi-level phase change composite material and its preparation method and application
  • A kind of multi-level phase change composite material and its preparation method and application

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preparation example Construction

[0036] To solve the above problems, combine figure 1 As shown, the embodiment of the present invention provides a preparation method of a multi-level phase change composite material, comprising the following steps:

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

[0038] S2, preparing graphene oxide into an aqueous dispersion, adding MOF-based carbide and a cross-linking agent, and freeze-drying after hydrothermal synthesis to obtain an aerogel 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 the aerogel carrier in a variety of ph...

Embodiment 1

[0060] The present 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 and add to 20mL deionized water and stir magnetically for 10min at room temperature, dissolve completely to obtain orange-yellow clear liquid; The gained mixture solution is placed in 50mL polytetrafluoroethylene In the lined reaction kettle, heated at 120°C for 72h for hydrothermal reaction, an orange-yellow solid precipitate can be obtained; the solid precipitate was treated in a nitrogen atmosphere at 500°C for 1h to obtain black MOF-C powder;

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

[0063] 3) Weigh a certain amo...

Embodiment 2

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

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

[0071] The remaining 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, firstly using a hydrothermal method to synthesize an organic metal frame MIL-100(Fe), and performing high-temperature calcination to obtain Carbide MOF-C; form a solution by mixing MOF-C and graphene oxide, and freeze-dry it into an aerogel carrier after hydrothermal synthesis; adopt vacuum impregnation to support the phase change material calcium chloride hexahydrate, and change the nucleating agent hexahydrate by changing the nucleating agent hexahydrate The addition amount of strontium chloride adjusts the freezing point of each gradient phase change layer, and finally the phase change layers with different freezing points are combined into a multi-level phase change composite material through an adhesive. The multi-level composite phase change material provided by the invention can efficiently store the waste heat of the battery, controllably release the stored heat when the ambient temperature decreases, and heat the battery to improve its low temperature resistance performance.

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 a preparation method and application thereof. Background technique [0002] Usually, the performance of lithium batteries is best when the operating temperature is controlled at 20°C to 45°C. In low temperature environments, due to the decrease of electrolyte conductivity, insufficient activation charge transfer energy, and increased resistance, battery performance will be seriously reduced. Traditionally, heating strategies such as hot air convection heating and AC 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 a suitable commercial electrode or electrolyte material. Through research, it is found that using the battery's own heat...

Claims

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Application Information

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