Battery membrane and preparation method thereof

A technology of battery diaphragm and diaphragm, which is applied in the direction of battery components, circuits, electrical components, etc., can solve the problems of affecting battery storage and service life, complex radiation grafting process, high radioactive safety requirements, etc., and achieves low production cost and high application The effect of broad prospects and environmental friendliness

Inactive Publication Date: 2018-10-16
温岭市聚智高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common battery separator is composed of vinylon non-woven fabric and cellophane, because the cellophane used as the main separator has poor alkali resistance and wet strength, which affects the storage and service life of the battery.
The other is radiation-grafted PP film,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 3 g of sodium dibutylnaphthalene sulfonate, 5 g of monoalkyl ether phosphate potassium salt and 4 g of polyethylene glycol in 100 ml of water, stir well and set aside.

[0026] Membrane 1: Soak a 200mmx200mm, 25µm thick, PP microporous membrane (wet method) with a porosity of 45% in the prepared solution for 60s, take it out and dry it with natural wind. Use polyvinyl alcohol as adhesive to laminate a sheet of 200mmx200mm, thickness 0.07-0.08mm, surface density 18g / m 2 Viscose fiber non-woven fabrics are used to make battery separators. The weight ratio of polyvinyl alcohol and water is 12:100.

[0027] Membrane 2: Soak a 200mmx200mm, 25µm thick, PP microporous membrane (dry process) with a porosity of 40% in the prepared solution for 60s, take it out and dry it with natural wind. Use polyvinyl alcohol as adhesive to laminate a sheet of 200mmx200mm, thickness 0.07-0.08mm, surface density 18g / m 2 Viscose fiber non-woven fabrics are used to make battery separa...

Embodiment 2

[0030] Take 6g of secondary alkyl sulfate, 8g of sodium isooctyl alcohol polyoxyethylene ether phosphate and 6g of polyglycerol and dissolve them in 100ml of water, stir well and set aside.

[0031] Membrane 4: Soak a 200mmx200mm, 25µm thick, PP microporous membrane (wet method) with a porosity of 45% in the prepared solution for 5 minutes, take it out and dry it with natural wind. Laminate a sheet of 200mmx200mm with carboxymethyl cellulose as adhesive, thickness 0.08-0.09mm, surface density 22g / m 2 Vinylon non-woven fabrics are used to make battery separators. The weight ratio of carboxymethyl cellulose and water is 10:100.

[0032] Membrane 5: Soak a 200mmx200mm, 25µm thick, PP microporous membrane (wet method) with a porosity of 55% in the prepared solution for 10 minutes, take it out and dry it with natural wind. Use sodium polyacrylate as adhesive to laminate a sheet of 200mmx200mm, thickness 0.10-0.11mm, surface density 30g / m 2 Vinylon non-woven fabrics are used to m...

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Abstract

The invention discloses a battery membrane and a preparation method thereof. The battery membrane is prepared through taking a modified PP microporous membrane as a main membrane, laminating hydrophilic non-woven fabric as a liquid absorption layer and bonding the main membrane and the liquid absorption layer by using an adhesive. The modified PP microporous membrane is obtained through carrying out surface activation treatment on the PP microporous membrane through a solution containing a surfactant, taking out the PP microporous membrane and drying by using natural wind, wherein the solutioncontaining the surfactant is prepared through dissolving one or a composition of more of a phosphate compound, a sulfonate compound and a sulfate compound and a polyol compound into water. The prepared battery membrane has excellent liquid absorption capacity and liquid storage capacity and excellent ion exchange capacity through material modification and liquid absorption layer lamination underthe premise of maintaining good alkali resistance, wet strength and mechanical property, and the storage life and the service life of a battery are ensured. The membrane is applicable to the battery of using a strong alkaline solution as an electrolyte.

Description

technical field [0001] The invention relates to the technical field of material modification, in particular, the invention relates to a battery diaphragm and a preparation method thereof. Background technique [0002] The separator suitable for batteries with strong alkaline solution as the electrolyte must meet the following performance requirements: have good isolation performance, separate the positive and negative electrodes of the battery, ensure that the two electrode materials are not in direct contact, and prevent the internal short circuit of the battery; have good Ion permeability, there is a certain pore size as an ion channel to ensure high ion mobility; it has good chemical stability, especially alkali resistance in the electrolyte; good liquid absorption, liquid retention and liquid absorption speed; Has a certain mechanical strength. [0003] At present, the common battery separator is composed of vinylon non-woven fabric and cellophane, because the cellophan...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/44H01M50/457
CPCH01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 朱沛林朱浩川
Owner 温岭市聚智高分子材料有限公司
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