High temperature-resistant lithium ion battery composite diaphragm and preparation method thereof

A lithium-ion battery, composite diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as high cost and complex process, and achieve the effects of low cost, strong heat resistance, and high oxidation resistance

Inactive Publication Date: 2018-05-18
深圳市博盛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wet process can better control the pore size and porosity, but the process is more complicated and the cost is higher
Chinese patent application CN201310552924.8 discloses a new type of high temperature resistant lithium battery diaphragm and its preparation process. The high temperature resistant lithium battery diaphragm is prepared by wet process, which has the disadvantages of wet process

Method used

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  • High temperature-resistant lithium ion battery composite diaphragm and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a. Material preparation step: use a density of 0.94-0.96g / cm 3 High-density polyethylene with a molecular weight between 450,000 and 450,000 is used as the high-density polyethylene raw material for the surface layer. The density is 0.91-0.93g / cm 3 Low-density polyethylene with a molecular weight of 300,000 is used as the low-density polyethylene raw material of the core layer, and silicon dioxide is used as the inorganic filler of the core layer. The low-density polyethylene is mixed with silicon dioxide and additives (leveling agent, Plasticizer, smooth agent) are mixed as the raw material of core layer, and wherein in the mixture of this low-density polyethylene and inorganic filler and additive, the ratio of low-density polyethylene and inorganic filler and additive is 60 parts by weight: 40 parts by weight: 1 part by weight.

[0035]b. Three-layer extrusion step: Use a single-screw extruder with an aspect ratio L / D≥34 to melt and extrude the high-density polyethy...

Embodiment 2

[0042] Using the same materials and process steps as in Example 1, but in the mixture of low-density polyethylene and inorganic filler and additive in step a, the ratio of low-density polyethylene to inorganic filler and additive is 75 parts by weight: 25 parts by weight: 1 part by weight to prepare a lithium-ion battery composite diaphragm. The thermal shrinkage rate of the obtained composite separator was 0.45% at 105° C. for 2 hours according to heat resistance measurement.

Embodiment 3

[0044] Using the same material and process steps as in Example 1, but in the mixture of low-density polyethylene and inorganic filler and additive in step a, the ratio of low-density polyethylene to inorganic filler and additive is 90 parts by weight: 10 parts by weight: 1 part by weight to prepare a lithium-ion battery composite diaphragm. The thermal shrinkage rate of the obtained composite separator was 0.60% at 105° C. for 2 hours according to heat resistance measurement.

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Abstract

The invention relates to a high temperature-resistant lithium ion battery composite diaphragm. The composite diaphragm has a skin / core / skin three-layer composite membrane structure. The skin layer includes high-density polyethylene. The core layer includes a mixture of low-density polyethylene and an inorganic filler. The composite diaphragm is prepared from raw materials of the surface layers andthe core layer through co-extrusion casting based on a dry process. The invention also relates to a preparation method of the lithium ion battery composite diaphragm based on the dry process. The lithium ion battery composite diaphragm has good heat resistance.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery diaphragms, and in particular relates to a high-temperature-resistant lithium-ion battery composite diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion battery separator is one of the four key main materials (positive electrode material, negative electrode material, electrolyte, separator) of lithium-ion battery. The diaphragm is placed between the positive and negative poles of the battery. It plays an insulating role in the battery to prevent the short circuit of the positive and negative poles. At the same time, it provides an ion transmission channel during the charging and discharging process. It is the core component of the lithium-ion battery. Its performance has a great impact on the battery The characteristics of internal resistance, capacity, cycle performance and safety performance have certain influence. As the material with the highest technical co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/451H01M50/457H01M50/489
CPCH01M50/403H01M50/411Y02E60/10
Inventor 毛鹏飞顾军钱超
Owner 深圳市博盛新材料有限公司
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