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Composition for manufacturing diaphragm of lithium battery

A lithium battery diaphragm and composition technology, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems that the diaphragm cannot meet the needs of power batteries, high longitudinal shrinkage, uneven hole formation, etc., to achieve low cost, High porosity and uniform pore formation

Inactive Publication Date: 2019-02-12
泰州衡川新能源材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there are many ingredients in the prior art, the cost is relatively high, and although its porosity is high, its longitudinal shrinkage rate is extremely high and the pores are not uniform, resulting in that the prepared separator cannot meet the requirements of power batteries. In order to solve the problem of use, a new composition for manufacturing lithium battery separators is provided, which can simultaneously have the advantages of high porosity, low shrinkage, uniform pore formation and low cost when used to manufacture separators

Method used

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  • Composition for manufacturing diaphragm of lithium battery
  • Composition for manufacturing diaphragm of lithium battery
  • Composition for manufacturing diaphragm of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Materials:

[0013] 10Kg polyethylene powder and 10Kg paraffin oil (the mixing ratio of polyethylene powder and paraffin oil is 1:1)

[0014] 10Kg polyethylene powder comprises the polyethylene particle of the antioxidant 1010 of 0.1Kg, the antioxidant 1076 of 0.1Kg and 9.8Kg (the quality of described antioxidant a, antioxidant b accounts for total polyethylene powder respectively 1% of the mass), the polyethylene particles are high-density polyethylene, and its molecular weight is 300,000.

[0015] Step 1. Put the polyethylene powder added with antioxidant into the extruder, melt it at 250°C, and add paraffin oil during the melting process;

[0016] Step 2. The liquid after mixing polyethylene powder and paraffin oil is extruded with a twin-screw extruder, and the extruded liquid is rapidly cooled to a temperature of 50°C to form an oil film;

[0017] Step 3. The cooled oil film is stretched longitudinally in 7 stages on stretching rollers at 110°C, the stretching ra...

Embodiment 2

[0023] Materials:

[0024] 10Kg polyethylene powder and 12.5Kg paraffin oil (the mixing ratio of polyethylene powder and paraffin oil is 0.8)

[0025] 10Kg polyethylene powder comprises the polyethylene particle of the antioxidant 168 of 0.78Kg, the antioxidant 264 of 0.78Kg and 8.44Kg (the quality of described antioxidant a, antioxidant b accounts for total polyethylene powder respectively 7.8% of the mass), the polyethylene particles are high-density polyethylene, and its molecular weight is 450,000.

[0026] Step 1. Put the polyethylene powder added with antioxidant into the extruder, melt it at 250°C, and add paraffin oil during the melting process;

[0027] Step 2. The liquid after mixing polyethylene powder and paraffin oil is extruded with a twin-screw extruder, and the extruded liquid is rapidly cooled to a temperature of 50°C to form an oil film;

[0028] Step 3. The cooled oil film is stretched longitudinally in 7 stages on stretching rollers at 110°C, the stretchi...

Embodiment 3

[0034] Materials:

[0035] 10Kg polyethylene powder and 28.46Kg paraffin oil (the mixing ratio of polyethylene powder and paraffin oil is 26:74)

[0036] 10Kg polyethylene powder comprises the polyethylene particle of the antioxidant 168 of 0.55Kg, the antioxidant 264 of 0.55Kg and 8.9Kg (the quality of described antioxidant a, antioxidant b accounts for total polyethylene powder respectively 5.5% of the mass), the polyethylene particles are high-density polyethylene, and its molecular weight is 600,000.

[0037] Step 1. Put the polyethylene powder added with antioxidant into the extruder, melt it at 250°C, and add paraffin oil during the melting process;

[0038] Step 2. The liquid after mixing polyethylene powder and paraffin oil is extruded with a twin-screw extruder, and the extruded liquid is rapidly cooled to a temperature of 50°C to form an oil film;

[0039] Step 3. The cooled oil film is stretched longitudinally in 7 stages on stretching rollers at 110°C, the stretc...

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Abstract

The invention relates to a composition for manufacturing a diaphragm of a lithium battery, which mainly solves the problem of failure in simultaneous obtaining of high porosity, high shrinkage rate and uniform pore forming in the prior art. The composition for manufacturing the diaphragm of the lithium battery adopts the technical scheme that the composition consists of polyethylene powder and paraffin oil, wherein the polyethylene powder comprises polyethylene particles, an antioxidant a and an antioxidant b; the mixing ratio of the polyethylene powder to the paraffin oil is 1:1 to 1:5.5; themasses of antioxidant a and antioxidant b respectively account for 0.1% to 1% of the mass of the polyethylene powder, so as to well solve the problem of failure in simultaneous obtaining of high porosity, high shrinkage rate and uniform pore forming in the prior art.

Description

technical field [0001] The invention relates to a composition for manufacturing lithium battery separators. Background technique [0002] Since the power battery pursues high current discharge, this requires that the porosity of the separator can be made higher. Ordinary separators have insufficient porosity to meet high current discharge requirements. At the same time, the diaphragm, as the insulating medium of the positive and negative electrodes, must have electronic insulation, and the diaphragm that simply increases the porosity will have through holes, which will cause defects in the battery production process, resulting in conductive impurities trapped in the through holes to form electronic conduction. point, affecting battery performance. [0003] Another example is a Chinese patent document CN103943804B which discloses a temperature-resistant and safe lithium-ion battery separator and a preparation method thereof. The separator adopts nano-dispersants, inorganic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/40H01M50/411H01M50/491
CPCH01M50/403H01M50/411Y02E60/10
Inventor 沈左松邓斌胡文忠赵晓亮李东田一政
Owner 泰州衡川新能源材料科技有限公司
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