Preparation method for organic/inorganic fiber composite diaphragm

An inorganic fiber and composite separator technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of unsuitable lithium-ion battery winding, insufficient softness, complicated process, etc., to improve cycle and rate performance, The effect of soft, good softness of the diaphragm material

Active Publication Date: 2016-03-23
TIANJIN XIANZHONG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no suitable material, especially the fiber made of all-ceramic materials, which is not soft enough and is not suitable for the use of lithium-ion battery winding and other processes, so only the lamination process can be used
Moreover, there are technical problems such as complicated process and poor safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing an organic / inorganic fiber composite diaphragm, comprising the following process steps:

[0032] 1. Pickling:

[0033] 100g of sepiolite mineral material with natural fiber structure is soaked in 1000g of sulfuric acid (sulfuric acid concentration is 5mol / L) solution for 3 hours to remove soluble impurities. Then filter, wash and dry to obtain unbundled sepiolite fibers.

[0034] 2. Ball milling:

[0035] Disperse it in 1000g of water, and mill it with 0.3mm zirconia balls for 1 hour to make a uniform mixed slurry. Wherein, the mass of the zirconia ball is 1000g.

[0036] 3. Dispersion:

[0037] Add 8.33g of polytetrafluoroethylene emulsion (60% mass concentration, the mass of pure polytetrafluoroethylene is 5g at this time) as a binder, and continue to uniformly disperse for 1 hour.

[0038] 4. Film making:

[0039] The slurry was passed through a casting machine and cast into a film with a thickness of 1 mm. The dried film is rolled by a ...

Embodiment 2

[0041] A method for preparing an organic / inorganic fiber composite diaphragm, comprising the following process steps:

[0042] 1. Pickling:

[0043] 1000Kg of sepiolite mineral material with natural fiber structure is soaked in 100 tons of hydrochloric acid (hydrochloric acid concentration is 0.1mol / L) solution for 10 hours to remove soluble impurities. Then filter, wash and dry to obtain unbundled sepiolite fibers.

[0044] 2. Ball milling:

[0045] Disperse it in 100 tons of water and mill it with 0.4mm zirconia balls for 10 hours to make a uniform mixed slurry. Among them, the mass of zirconia balls is 10 tons.

[0046] 3. Dispersion:

[0047] Add 33Kg of polyethylene emulsion (30% mass concentration, the mass of pure polyethylene is 10Kg) as a binder, and continue to uniformly disperse for 1 hour.

[0048] 4. Film making:

[0049] The slurry was passed through a casting machine and cast into a film with a thickness of 0.1 mm. The dried film is rolled by a finishing ...

Embodiment 3

[0051] A method for preparing an organic / inorganic fiber composite diaphragm, comprising the following process steps:

[0052] 1. Pickling:

[0053] 10g of sepiolite mineral material with natural fiber structure is soaked in 500g of nitric acid (concentration of nitric acid is 2mol / L) solution for 2 hours to remove soluble impurities. Then filter, wash and dry to obtain unbundled sepiolite fibers.

[0054] 2. Ball milling:

[0055] Disperse it in 500g of water, and mill it with 0.2mm zirconia balls for 1 hour to make a uniform mixed slurry. Wherein, the mass of the zirconia ball is 50g.

[0056] 3. Dispersion:

[0057] 0.333g of polytetrafluoroethylene emulsion (60% mass concentration, the mass of pure polytetrafluoroethylene at this time is 0.2g) was added therein as a binder, and continued to uniformly disperse for 1 hour.

[0058] 4. Film making:

[0059]The slurry was passed through a casting machine and cast into a film with a thickness of 0.5 mm. The dried film is...

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Abstract

The invention relates to a preparation method for an organic/inorganic fiber composite diaphragm, and belongs to the technical field of lithium ion battery composite diaphragms. The preparation method comprises the following process steps: (1) acid cleaning: cleaning a sepiolite mineral material of a natural fiber structure with an acid solution, so as to remove soluble impurities and realize bundle separation; (2) ball milling: dispersing the sepiolite mineral material cleaned with the acid solution in an water solution, and carrying out ball milling by a milling ball to prepare a uniformly mixed slurry; (3) dispersion: adding a water-soluble organic emulsion as a bonding agent for uniform dispersion; (4) diaphragm preparation: feeding the slurry into a casting machine, carrying out heating and drying to remove moisture and form a thin film, and conducting rolling, slitting and winding on the thin film by adopting a finishing roll of which the surface is coated with polytetrafluoroethylene, so as to prepare the organic/inorganic fiber composite diaphragm. The preparation method has the advantages of being stable in process, convenient to operate, safe and reliable; the prepared organic/inorganic fiber composite diaphragm is relatively high in porosity, relatively thin, and not only resistant to high temperature but also soft; the preparation method can be widely applied to manufacture of various lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery composite diaphragms, and in particular relates to a preparation method of organic / inorganic fiber composite diaphragms. Background technique [0002] At present, with the rapid development of new energy industries such as electric vehicles, lithium-ion batteries with light weight and high specific energy have been widely used. Especially in the fields of power batteries for electric vehicles, energy storage batteries, and tool batteries, lithium-ion batteries have become the only candidate power source. However, due to the poor safety performance of lithium-ion batteries, which are prone to fire and explosion under conditions such as overcharge, overdischarge, short circuit, and acupuncture, the application has been questioned by the public. [0003] The existing main technical means to improve the safety of lithium-ion batteries include: diaphragm to achieve high-temperature closed-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/44H01M50/446H01M50/491
CPCH01M50/446H01M50/403Y02E60/10
Inventor 李凤民纪继坤
Owner TIANJIN XIANZHONG SCI & TECH
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