Method for preparing ceramic fiber diaphragm for thermal batteries based on 3D printing technology

A ceramic fiber, 3D printing technology, used in battery pack parts, circuits, electrical components, etc., can solve problems affecting battery life, reliability and safety, unstable high temperature performance, accelerated aging, etc., and achieve stable discharge. Excellent performance, extended life, enhanced adsorption capacity

Inactive Publication Date: 2019-08-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Part of the current thermal battery separator is made of powdered magnesia or boehmite mixed with electrolyte to form a separator. The ceramic separator made in this way has good corrosion resistance, but has low toughness and is easy to break when subjected to external force, affecting the battery. longevity, reliability and safety
Another part is to use a modified diaphragm: one is a modified organic diaphragm. By coating the ceramic slurry on the polyolefin film, a diaphragm with high thermal stability is obtained. The corrosion resistance of this diaphragm has been improved. However, its high-temperature performance is unstable. Organic fibers will shrink significantly at high temperatures, and the aging speed will be accelerated in corrosive environments, which will affect the life, reliability and safety of batteries; the other is modified inorganic fibers. The inorganic fiber has strong oxidation resistance and excellent high temperature stability, which can improve the high temperature and corrosion resistance of the modified diaphragm. The inorganic fibers currently used include BN fiber and asbestos fiber, and the thermal battery is made of modified ceramic fiber Diaphragm is still blank

Method used

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  • Method for preparing ceramic fiber diaphragm for thermal batteries based on 3D printing technology
  • Method for preparing ceramic fiber diaphragm for thermal batteries based on 3D printing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1, according to the mass ratio, take mullite short fiber, nano-silica powder and guar gum according to the ratio of 95:5:0.5, and the diameter is and a length of Mix mullite short fiber with nano-silica powder, then add guar gum and stir evenly, then add deionized water and stir to make the slurry produce rheological properties of shear thinning, and complete the preparation of ceramic fiber slurry , so that the solid phase of the ceramic fiber slurry is 30%;

[0034] Step 2. Put the ceramic fiber slurry into the barrel of the molding equipment of the 3D printer, use UG to build the model, and then import the model into the Simplified 3D software for parameter modification. After finding the suitable printing parameters through pre-printing, use the Simplified 3D software The online control 3D printer prints and stacks layer by layer to make a ceramic fiber separator, so that the thickness of the ceramic fiber separator is

[0035] Step 3: Pre-freeze the prin...

Embodiment 2

[0041] Step 1, according to the mass ratio, take aluminum silicate short fiber and high alumina short fiber mixed fiber, nano-silica powder and guar gum according to the ratio of 95:5:1.5, and the diameter is length is The ratio of aluminum silicate short fibers and nano-silica powder is mixed, then add guar gum and stir well, then add deionized water and stir to make the slurry produce rheological properties of shear thinning, and complete the ceramic fiber slurry Preparation of the material, so that the solid ratio of the ceramic fiber slurry is 30% to 50%;

[0042] Step 2. Put the ceramic fiber slurry into the barrel of the molding equipment of the 3D printer, use UG to build the model, and then import the model into the Simplified 3D software for parameter modification. After finding the suitable printing parameters through pre-printing, use the Simplified 3D software The online control 3D printer prints and stacks layer by layer to make a ceramic fiber separator, so th...

Embodiment 3

[0049] Step 1, according to the mass ratio, take mullite short fiber, aluminum silicate short fiber and high alumina short fiber mixed fiber with nano-silica powder and guar gum according to 95:5:1, and the diameter is length is The mixed fibers of mullite short fiber, aluminum silicate short fiber and high alumina short fiber are mixed with nano-silica powder, then add guar gum and stir well, then add deionized water and stir to make the slurry produce shear Shear thinning rheological properties, complete the preparation of the ceramic fiber slurry, so that the solid ratio of the ceramic fiber slurry is 40%;

[0050] Step 2. Put the ceramic fiber slurry into the barrel of the molding equipment of the 3D printer, use UG to build the model, and then import the model into the Simplified 3D software for parameter modification. After finding the suitable printing parameters through pre-printing, use the Simplified 3D software The online control 3D printer prints and stacks laye...

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Abstract

The invention discloses a method for preparing a ceramic fiber diaphragm for thermal batteries based on the 3D printing technology. The method is characterized in that the method of printing the ceramic fiber diaphragm through direct writing can control printing precision by controlling a diameter of an extrusion head, porosity is precisely controlled by a solidification ratio of the slurry so that the porosity required for ion migration is achieved while the electrolyte is loaded as much as possible, discharge resistance is reduced, and the output voltage is stable. The method is advantaged in that 3D printing is utilized to make the ceramic fiber diaphragm, thickness of the diaphragm can be controlled to meet use requirements of various thermal batteries, the modified ceramic fiber diaphragm produced by the method has excellent high temperature stability and high corrosion resistance, the life of the thermal battery can be extended by 5-10 years, the replacement frequency is reduced,and a lot of manpower and financial expenses are saved.

Description

technical field [0001] The invention belongs to the field of preparing high-temperature-resistant battery diaphragms from ceramic fibers, and in particular relates to a preparation method of ceramic fiber diaphragms for thermal batteries based on 3D printing technology. Background technique [0002] High temperature molten salt battery is a kind of battery developed in the 1950s to 1960s. This battery has high specific energy and specific power, and can work in high temperature environment, so it can be used in missiles, rockets and emergency electronic instruments. As a power supply, it is also used in non-military equipment such as emergency power supply, fire alarm power supply, and underground high-temperature prospecting power supply. [0003] There are several single cells inside the high-temperature molten salt battery, and the single cell is composed of a positive electrode sheet, a separator, and a negative electrode sheet. The diaphragm is one of the key component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/431H01M50/44Y02E60/10
Inventor 鲁中良李坚苗恺李涤尘
Owner XI AN JIAOTONG UNIV
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