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Heat-resisting lithium battery diaphragm and preparation method thereof

A technology for lithium battery separators and battery separators, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of complex manufacturing process, high cost, and low pressure resistance, and achieve simple manufacturing process and low cost , the effect of high porosity

Active Publication Date: 2016-01-27
浙江清优材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. The production process is complicated, the cost is high, and the compression resistance is low.

Method used

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  • Heat-resisting lithium battery diaphragm and preparation method thereof
  • Heat-resisting lithium battery diaphragm and preparation method thereof
  • Heat-resisting lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 65% of component A polyether polyol (the following are weight ratios), 1% of foaming agent, and 1% of catalyst, pour it into the mixer, stir evenly, and then weigh 33% of B component MDI. Put the weighed A component material and B component material into the A material tank and B material tank of the polyurethane foam machine respectively, and after being stirred by the polyurethane foam machine, pour it into a rectangular or square mold for foaming and molding. Among them, the polyurethane foam machine A material pump speed is 400-500 rpm, B material pump speed is 300-400 rpm; stirring speed is 1700-2100 rpm; injection material is 100-3000 g / s; mold temperature is 40-50 degrees ; Foaming time 8-10 minutes.

[0036] Place the foamed block product on a special foam cutting machine, cut into slices according to the thickness requirements, and then stamp the sheet according to the size and specification requirements. Its thickness is 5μm, the porosity is 70%, the ai...

Embodiment 2

[0038] Weigh 62% of component A polyether polyol (the following are weight ratios), 0.8% of blowing agent, 1% of catalyst, and 0.2% of stabilizer, pour it into the mixer, stir evenly, and then weigh 30% of B component MDI it is good. Put the weighed A component material and B component material into the A material tank and B material tank of the polyurethane foam machine respectively, and after being stirred by the polyurethane foam machine, pour it into a rectangular or square mold for foaming and molding. Among them, the polyurethane foam machine A material pump speed is 400-500 rpm, B material pump speed is 300-400 rpm; stirring speed is 1700-2100 rpm; injection material is 100-3000 g / s; mold temperature is 40-50 degrees ; Foaming time 8-10 minutes.

[0039] Place the foamed block product on a special foam cutting machine, cut into slices according to the thickness requirements, and then stamp the sheet according to the size and specification requirements. Its thickness i...

Embodiment 3

[0041] Weigh 56% of A component polyether polyol (the following are weight ratios), 0.8% of foaming agent, 0.8% of catalyst, 0.4% of stabilizer, and 10% of flame retardant and pour it into the mixer, stir evenly, and then B component MDI32% weighed well. Put the weighed A component material and B component material into the A material tank and B material tank of the polyurethane foam machine respectively, and after being stirred by the polyurethane foam machine, pour it into a rectangular or square mold for foaming and molding. Among them, the polyurethane foam machine A material pump speed is 400-500 rpm, B material pump speed is 300-400 rpm; stirring speed is 1700-2100 rpm; injection material is 100-3000 g / s; mold temperature is 40-50 degrees ; Foaming time 8-10 minutes.

[0042] Place the foamed block product on a special foam cutting machine, cut into slices according to the thickness requirements, and then stamp the sheet according to the size and specification requireme...

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Abstract

The invention provides a heat-resisting lithium battery diaphragm and a preparation method thereof. The method comprises the following steps: (a) weighing a component A, which comprises the following materials: polyether polyol, a foaming agent, a catalyst, a stabilizer and a fire retardant in weight ratio, pouring the materials into stirring equipment and mixing the materials evenly; (b) weighing a component B MDI in the weight ratio, respectively feeding the weighed materials of the component A and the material of the component B into a material jar A and a material jar B of a polyurethane foaming machine, stirring the materials in the polyurethane foaming machine, filling the materials into a rectangular or square mold, and carrying out foaming molding; and (c) putting a pelletized product which is molded in a foaming manner on a special foam horizontal cutting machine, cutting the pelletized product into slices according to the thickness requirement, and carrying out punch forming on the slices according to the size specification requirements, wherein the thicknesses of the slices are 5-41 microns; the porosity is 70%-75%; and the air permeability is 15-30 sec / 100cc. The heat-resisting lithium battery diaphragm has the advantages of high porosity, low thickness, high absorption amount, high ion permeability, low resistance, good compressive property, stable electrochemical properties, simplicity in manufacturing process, low cost, high quality and the like.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-temperature-resistant lithium battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly due to their high energy density, long cycle life and high voltage, and have been widely used in mobile phones, portable computers, cameras, video cameras, electric vehicles and other fields, and the application fields are still Constantly expanding. Lithium-ion batteries consist of positive and negative electrodes, electrolytes and separators. The separator is one of the key inner components of lithium-ion batteries. Its main function is to isolate the positive and negative electrodes and prevent electrons from passing through, while allowing ions to pass through, thereby completing the rapid transmission of lithium ions between the positive and negative electrodes during charge and discharge. . [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/406H01M50/411H01M50/489H01M50/491
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 李振勇
Owner 浙江清优材料科技有限公司
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