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Organic/inorganic composite porous isolating membrane

An inorganic composite and separator technology, applied in the direction of synthetic resin layered products, structural parts, battery pack parts, etc., can solve the problems of increasing lithium ion resistance, poor performance of lithium ion batteries, and failure to obtain internal short circuit prevention effects, etc. , to achieve high thermomechanical stability and improve safety performance

Inactive Publication Date: 2010-05-12
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, during the coating or dip coating process, in order to maintain good adhesion between the inorganic particles and between the organic / inorganic composite layer and the porous substrate, the weight ratio of the inorganic particles in the slurry to the binder polymer Between 60%: 40% and 80%: 20%, it will result in low heat-resistant mechanical stability of the organic / inorganic composite layer, and cannot obtain a satisfactory internal short-circuit prevention effect, which affects the safety of lithium-ion batteries performance
In addition, high binder polymer content (20% to 40%) increases the resistance of Li-ion movement, leading to poor Li-ion battery performance

Method used

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  • Organic/inorganic composite porous isolating membrane
  • Organic/inorganic composite porous isolating membrane
  • Organic/inorganic composite porous isolating membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0048] Example 1-5: Preparation of organic / inorganic composite porous membrane using gravure printing method

Embodiment 1

[0050] Add 25g of polyvinylidene fluoride (PVDF) to N-methyl-2-pyrrolidone (NMP) and dissolve at 45°C for 30 minutes or more to form a homogeneous polymer solution; add 975g to the polymer solution Inorganic Al 2 o 3 Granules and high-speed stirring to make the polymer and Al 2 o 3 The particles are uniformly dispersed, and Al 2 o 3 : PVDF is 97.5%: 2.5% slurry; then, use the gravure printing method to print the slurry to the surface of the polyethylene porous membrane, and dry to obtain the organic / inorganic composite porous diaphragm (97.5% Al 2 o 3 and 2.5% PVDF). The thickness of the organic / inorganic composite layer can be adjusted by the depth of the gravure hole and the solid content of the slurry (the weight percentage of the weight of the inorganic particles and the binder polymer in the total slurry), and the preparation process and cross-sectional structure of the organic / inorganic composite porous membrane Respectively as image 3 with figure 2 shown.

Embodiment 2

[0052] Al in embodiment 1 2 o 3 And the weight ratio of PVDF is adjusted to 98%: 2%, repeats the step in embodiment 1, obtains organic / inorganic composite porous membrane (98%Al 2 o 3 and 2% PVDF).

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Abstract

The invention discloses an organic / inorganic composite porous isolating membrane, which comprises a porous substrate with holes, and an organic / inorganic composite layer arranged on at least one surface or a partial surface area of the porous substrate, wherein the organic / inorganic composite layer is a layer of a mixture of inorganic particles and adhesive polymer; the inorganic particles are interconnected and are fixed through the adhesive polymer; and gaps among the inorganic particles form holes. In the organic / inorganic composite layer of the organic / inorganic composite porous isolating membrane, a weight ratio of the inorganic particles with good thermol stability to the adhesive polymer is between 80 percent: 20 percent and 99.5 percent: 0.5 percent; and the organic / inorganic composite layer has good supporting function. Therefore, the organic / inorganic composite porous isolating membrane has high thermo-mechanical stability.

Description

technical field [0001] The invention relates to a separator, in particular to an organic / inorganic composite porous separator which can improve the safety performance of a lithium ion battery. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, due to their advantages such as light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient and wide temperature range, in just over ten years It has developed rapidly and is widely used to provide energy for various mobile devices and devices such as video cameras, notebook computers, portable DVDs, and digital cameras. [0003] Lithium-ion batteries usually include positive electrode sheets, separators, negative electrode sheets, electrolytes and battery packaging shells. The positive electrode materials are usually made of cobalt lithium oxide, nickel cobalt lithium oxide and manganese lithium oxide, etc.; the separator is mainly composed of polyethylen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B3/24B32B27/04H01M10/36H01M50/451H01M50/491
CPCY02E60/12Y02E60/10
Inventor 邓勇强付成华许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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