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Porous ceramic fiber diaphragm material for thermal battery and preparation method of porous ceramic fiber diaphragm material

A diaphragm material and ceramic fiber technology, which is applied in the field of porous ceramic fiber diaphragm materials for thermal batteries and its preparation, can solve the problems of low local strength, leakage of molten electrolyte, poor uniformity of ceramic diaphragm materials, etc., and achieve good discharge performance and guarantee The effect of safety performance

Pending Publication Date: 2021-11-12
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Smaller separators also hamper the design of larger unit thermal cells
Moreover, there is a risk of molten electrolyte leakage in the case of long-term discharge of the magnesium oxide sheet separator, which will cause the positive and negative electrodes of the hot battery to contact and cause short circuits and other problems.
[0004] In order to improve the safety performance and output power of thermal batteries, porous ceramic fiber separators can be used. The ceramic fibers are inorganic fibers. Due to their own characteristics such as high brittleness and high strength, ceramic fibers are difficult to disperse and form in the process of wet forming. Yes, ceramic fibers with poor dispersion will cause problems such as poor uniformity of the prepared ceramic diaphragm material, low local strength, and difficulty in subsequent processing.
After the ceramic fiber separator is wet formed, if the organic adhesive is used, the separator will no longer have the corresponding strength when working at 550 degrees Celsius, so that the normal, safe and efficient discharge of the thermal battery cannot be guaranteed.

Method used

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  • Porous ceramic fiber diaphragm material for thermal battery and preparation method of porous ceramic fiber diaphragm material
  • Porous ceramic fiber diaphragm material for thermal battery and preparation method of porous ceramic fiber diaphragm material
  • Porous ceramic fiber diaphragm material for thermal battery and preparation method of porous ceramic fiber diaphragm material

Examples

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Effect test

Embodiment 1

[0045] Example 1 Porous ceramic fiber diaphragm material for thermal battery

[0046] A kind of porous ceramic fiber diaphragm material for thermal battery, wherein the quantitative of diaphragm material is 70g / m 2 , the diaphragm material method comprises the steps:

[0047] (1) According to the quantitative requirements and area of ​​the porous ceramic fiber diaphragm material, take mullite ceramic fibers and bonding fibers (PE) with a diameter of 2-3 microns, wherein, in terms of weight percentage, ceramic fibers account for 95 %, the adhesive fiber (PE) accounts for 5%, the ceramic fiber and the adhesive fiber are mixed and put into water, and then they are decomposed in a decomposer to obtain a uniform fiber suspension.

[0048] (2) The fiber suspension obtained in step (1) is wet-molded to prepare a non-woven ceramic fiber diaphragm, which is then placed in a desiccator to dry at a temperature of 95°C, and the resulting added bonding fiber The ceramic fiber, its SEM ...

Embodiment 2

[0052] Example 2 Porous ceramic fiber diaphragm material for thermal battery

[0053] A kind of porous ceramic fiber membrane material for thermal battery, wherein the quantitative of membrane material is 80g / m 2 , the diaphragm material method comprises the steps:

[0054] (1) According to the quantitative requirements and the area of ​​the porous ceramic fiber diaphragm material, respectively weigh mullite ceramic fibers and bonding fibers (PE) with a diameter of 2-3 microns, wherein, in terms of weight percentage, mullite ceramic fibers account for 95%, bonding fiber (PE) accounts for 5%, put the ceramic fiber and bonding fiber into water after mixing, and decompose in a decomposer to obtain two uniform fiber suspensions;

[0055] (2) The non-woven ceramic fiber separator was prepared by wet forming two parts of the fiber suspension, and then placed in a desiccator for drying.

[0056] (3) Prepare the aluminum isopropoxide binder solution according to the following meth...

Embodiment 3

[0059] Example 3 Porous ceramic fiber diaphragm material for thermal battery

[0060] A kind of porous ceramic fiber membrane material for thermal battery, wherein the quantitative of membrane material is 80g / m 2 , the diaphragm material method comprises the steps:

[0061] (1) According to the quantitative requirements and area of ​​the porous ceramic fiber diaphragm material, take mullite ceramic fibers and bonding fibers (PE) with a diameter of 5-7 microns respectively, wherein, in terms of weight percentage, mullite ceramic fibers Accounting for 95%, adhesive fiber (PE) accounted for 5%, after mixing the ceramic fiber and adhesive fiber, put it into water, and decompose in a decomposer to obtain two uniform fiber suspensions;

[0062] (2) The non-woven ceramic fiber separator was prepared by wet forming two parts of the fiber suspension, and then placed in a desiccator for drying.

[0063] (3) Prepare the aluminum isopropoxide binder solution according to the following...

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Abstract

The invention relates to a porous ceramic fiber diaphragm material for a thermal battery and a preparation method thereof. The diaphragm material is composed of ceramic fibers and an inorganic binder. The diaphragm material can be widely applied to high-power output high-voltage thermal batteries and large-pulse thermal batteries, and the two types of thermal batteries can be used as main power supplies of weapons such as torpedoes, submarine-launched nuclear warships, hypersonic cruise missiles, hypersonic aircrafts and near space aircrafts.

Description

technical field [0001] The invention belongs to the technical field of thermal battery diaphragm materials, and in particular relates to a porous ceramic fiber diaphragm material for thermal batteries and a preparation method thereof. Background technique [0002] Thermal battery, also known as heat-activated battery, mainly uses solid molten salt as electrolyte, and relies on electrical activation or mechanical activation to ignite the internal heat source. After activation, the heating system of the battery reaches the working temperature (the working temperature is between 350°C and 550°C ), at this time, the solid molten salt electrolyte changes from a solid state to a liquid state, so that the positive and negative electrodes react with the electrolyte to generate a kind of reserve battery, because the thermal battery has a fast activation speed, high instantaneous output power, no maintenance, and is not subject to The outstanding advantages of limited installation ori...

Claims

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Application Information

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IPC IPC(8): H01M50/434H01M50/44H01M50/489H01M50/491H01M50/494H01M50/403H01M6/36
CPCH01M6/36Y02E60/10
Inventor 龙金夏堃宇胡健王建勇郭灏唐立成邹睿
Owner SOUTH CHINA UNIV OF TECH
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