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High-conductivity film phase change material for thermal battery, preparation method and application

A phase-change material, high-conductivity technology, used in primary battery use/maintenance, heat exchange materials, battery cooling/heating, etc., can solve problems such as battery temperature runaway, battery internal pressure increase, battery explosion, etc. Cost of fabrication, enhanced conductivity, reduced complexity effects

Inactive Publication Date: 2020-11-10
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Fe-KClO 4 The thermal shock temperature at the initial stage of the reaction can reach 1000 ° C ~ 1300 ° C, and the commonly used positive electrode material is FeS 2 and CoS 2 , and their decomposition temperatures are 550°C and 650°C respectively. High temperature will lead to the decomposition of positive electrode materials, generate sulfur vapor, and increase the internal pressure of the battery, which will cause the local temperature of the battery to run out of control in the initial stage of the reaction, and the battery will explode and other adverse consequences.

Method used

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  • High-conductivity film phase change material for thermal battery, preparation method and application

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Embodiment 1

[0032] A method for preparing a high-conductivity thin-film phase-change material for a thermal battery. The raw material is composed of an easily soluble inorganic salt, a high-conductivity conductive agent, an adhesive, an adsorbent and a matrix film. The preparation method comprises the following steps:

[0033] Step 1: Weigh 31.5 parts of NaCl and 38.5 parts of KCl into a beaker, add deionized water to prepare a supersaturated solution, in which the mass of solute and the mass of deionized water are prepared according to 1:1~1.2, and then add 3.0 1 part of sodium hydroxymethylcellulose (CMC) and 3.0 parts of styrene-butadiene rubber (SBR) adhesive, stirring constantly, the number of revolutions of the agitator is 900r / min, and the stirring time is 2.5h;

[0034] Step 2: Add 25 parts of graphene conductive agent and 3 parts of MgO adsorbent to step 1 and fully stir, the rotation speed of the stirrer is 500r / min, and the stirring time is 4h, to obtain a uniformly mixed phase ...

Embodiment 2

[0038] A method for preparing a high-conductivity thin-film phase-change material for a thermal battery. The raw material is composed of an easily soluble composite inorganic salt, a high-conductivity conductive agent, an adhesive, an adsorbent and a matrix film. The preparation method comprises the following steps:

[0039] Step 1: Weigh 12.0 parts of Li 2 CO 3 , 12.0 parts of Na 2 CO 3 and 36.0 parts K 2 CO 3 Pour parts into a beaker, add deionized water to prepare a supersaturated solution, wherein the mass of solute and the mass of deionized water are prepared according to 1:1~1.2, and then add 2.5 parts of sodium hydroxymethyl cellulose (CMC) and 2.5 parts of aluminum dihydrogen phosphate adhesive, stirring continuously, the rotation speed of the stirrer is 1000r / min, and the stirring time is 5h;

[0040] Step 2: Add 40.0 parts of expanded graphite conductive agent and 6.0 parts of MgO adsorbent to step 1 and stir fully, the rotation speed of the stirrer is 500r / min, a...

Embodiment 3

[0044] A method for preparing a high-conductivity thin-film phase-change material for a thermal battery. The raw material is composed of an easily soluble composite inorganic salt, a high-conductivity conductive agent, an adhesive, an adsorbent and a matrix film. The preparation method comprises the following steps:

[0045] Step 1: Weigh 35.0 parts of Na 2 CO 3 and 35.0 parts K 2 CO 3 Pour one part of easily soluble phase-change inorganic salt into a beaker, add deionized water to prepare a supersaturated solution, in which the mass of solute and the mass of deionized water are prepared according to the ratio of 1:1 to 1.2, and then add 4.0 parts of hydroxymethyl cellulose Sodium plain (CMC) and 2.0 parts of sodium silicate are used as adhesive, stirring continuously, the rotation speed of the stirrer is 1500r / min, and the stirring time is 3h;

[0046] Step 2: Add 30 parts of graphene conductive agent and 3 parts of BN adsorbent to step 1 and fully stir, the rotation speed...

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Abstract

The invention discloses a high-conductivity film phase change material for a thermal battery in the technical field of thermal batteries. Raw materials comprise: a soluble inorganic salt, a conductiveagent and an adhesive, wherein the soluble inorganic salt comprises at least two of NaCl, Na2SO4, Na2CO3, KCl, K2SO4, K2CO3, LiCl, Li2SO4, Li2CO3, MgCl2 and MgSO4, and the conductive agent comprisesone of expanded graphite, carbon nanotubes, graphene and activated carbon. The preparation method comprises the following steps: dissolving the easily soluble inorganic salt in water by using the principle that the easily soluble inorganic salt is soluble in water, fully stirring and mixing the components, mixing the conductive agent and the soluble inorganic salt together by using the adhesive toform slurry, and coating the slurry to form the thin film phase change material. Firstly, phase change is utilized to slow down thermal shock and prolong the working time of the electrolyte; secondly, the conductive agent plays a conductive role, electrons can be transmitted through the high-conductivity thin film phase change material, and then the service life of the thermal battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a high-conductivity thin-film phase-change material for thermal batteries, a preparation method and application thereof. Background technique [0002] The thermal battery is a fast-activated lithium molten salt battery. It ignites the internal heating system by means of electrical activation or mechanical activation, and releases a large amount of heat in a short time, turning the non-conductive solid inorganic electrolyte into a high-conductivity liquid electrolyte, thereby The thermal battery starts working. At room temperature, the internal resistance of the solid inorganic electrolyte is very large, and the thermal battery has almost no self-discharge. When the heating system rapidly raises the temperature inside the thermal battery to above the melting point of the solid electrolyte, a high-conductivity ionic conductor electrolyte is formed, and the th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06H01M6/36H01M6/50
CPCC09K5/063H01M6/36H01M6/5038
Inventor 王明灿张小洪张祖逸何生亮唐军冉岭潘志鹏王京亮赵洪楷
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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