Wet diaphragm and preparation process thereof

A diaphragm and wet process technology, applied in the field of wet process diaphragm and its preparation, can solve the problems affecting the service life, the safety performance of high-power discharge, the large proportion of ceramic particles, and the inability to meet the market demand, etc. The effect of improved flatness, increased cost, and long service life

Inactive Publication Date: 2020-07-31
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

Although this device can be made into a lithium battery separator, its service life, safety, and high-power discharge performance are affected due to the large proportion of ceramic particles, and the production cost is high, so it does not meet the current market demand.

Method used

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  • Wet diaphragm and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] material:

[0024] 100Kg polyethylene (polyethylene particles are high-density polyethylene with a molecular weight of 300,000);

[0025] 100Kg glycerin (the mixing ratio of polyethylene and glycerin is 1:1);

[0026] The antioxidant 1010 of 1Kg (the quality of antioxidant accounts for 1% of polyethylene quality);

[0027] 0.1Kg of nano-ceramic powder (the quality of the anti-nano-ceramic powder accounts for 0.1% of the polyethylene mass, and the particle diameter is 800nm).

[0028] Preparation:

[0029] (1) take by weighing 100Kg polyethylene, the antioxidant 1010 of 1Kg and the nano ceramic powder of 0.1Kg and fully mix;

[0030] (2) Pass the mixed raw materials in step (1) through an extruder with a temperature of 200°C to obtain a high-temperature melt, weigh 100Kg of glycerol and put it into the extruder, fully mix the pore-forming agent with the high-temperature melt and Extruded through a twin-screw extruder, the extruded melt is rapidly cooled to 10°C to fo...

Embodiment 2

[0037] material:

[0038] 100Kg polyethylene (polyethylene particles are high-density polyethylene with a molecular weight of 450,000);

[0039] 210Kg of DBP (the mixing ratio of polyethylene and DBP is 1:2.1);

[0040] The antioxidant 1076 of 0.4Kg and the antioxidant 168 of 0.3Kg (the total mass of antioxidant accounts for 0.7% of polyethylene quality);

[0041] 0.3Kg of nano-ceramic powder (the quality of nano-ceramic powder accounts for 0.3% of polyethylene mass, particle diameter is 650nm);

[0042] Sodium polyacrylate of 0.1Kg (the quality of stabilizer accounts for 0.1% of the quality of polyethylene)

[0043] Preparation:

[0044] (1) take by weighing 100Kg polyethylene, the antioxidant 1076 of 0.4Kg and the antioxidant 168 of 0.3Kg and the nano ceramic powder of 0.3Kg, the sodium polyacrylate of 0.1Kg fully mix;

[0045] (2) Pass the mixed raw materials in step (1) through an extruder with a temperature of 220°C to obtain a high-temperature melt, weigh 210Kg of DB...

Embodiment 3

[0052] material:

[0053] 100Kg polyethylene (polyethylene particles are high-density polyethylene with a molecular weight of 600,000);

[0054] 320Kg paraffin oil (the mixing ratio of polyethylene and paraffin oil is 1:3.2);

[0055] The antioxidant 2246 of the antioxidant 264 of 0.1Kg, the antioxidant 1098 of 0.2Kg and 0.2Kg (the total mass of antioxidant accounts for 0.5% of polyethylene quality);

[0056] 0.5Kg of nano-ceramic powder (the quality of anti-nano-ceramic powder accounts for 0.5% of the polyethylene mass, and the particle diameter is 450nm);

[0057] 0.2Kg of sodium hexametaphosphate and 0.1Kg of polyvinyl alcohol (the total mass of the stabilizer accounts for 0.3% of the polyethylene mass).

[0058]Preparation:

[0059] (1) Take by weighing 100Kg polyethylene, 0.1Kg of antioxidant 264, 0.2Kg of antioxidant 1098, 0.2Kg of antioxidant 2246, 0.5Kg of nano-ceramic powder, 0.2Kg of sodium hexametaphosphate and 0.1Kg The polyvinyl alcohol is fully mixed;

[006...

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Abstract

The invention discloses a wet-process diaphragm and a preparation process thereof. The wet-process diaphragm comprises the following components: polyethylene, a pore-forming agent, an antioxidant andnano ceramic powder, wherein the mass mixing ratio of the polyethylene to the pore-forming agent is 1:1-1:5.5, and the mass of the antioxidant and the mass of the nano ceramic powder account for 0.1%-1% of the mass of the polyethylene. By adjusting the formula and preparation process of the product, the finally prepared diaphragm has the advantages of high-power discharge resistance, long servicelife and high safety performance.

Description

technical field [0001] The invention relates to a wet-process diaphragm and a preparation process thereof. Background technique [0002] Driven by the current market demand for power batteries, battery manufacturers are generally pursuing the production of lithium-ion batteries with high-power discharge, long service life, and high safety performance. However, due to the limitations of various performances of the wet-process separator produced under the traditional process, it is generally necessary to improve the performance of the base film through a surface coating process in order to meet the requirements for battery assembly and use. [0003] Another example is the Chinese patent document CN108832064A which discloses a composite ceramic porous lithium battery separator, a preparation method and its application, with 18-35% polyethylene, 50-60% pore-forming agent, 5-8% antioxidant, and 3-3% ceramic particles. 8% is used as raw material, and the membrane is prepared by w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/446H01M50/489H01M50/491H01M50/494
CPCH01M50/403H01M50/409Y02E60/10
Inventor 黄乐飞邓斌沈左松李东赵晓亮田一政胡文忠
Owner 泰州衡川新能源材料科技有限公司
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