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Organic/inorganic composite porous thin film and electrochemical energy storing device using same

A porous film, inorganic composite technology, applied in the field of electrochemical energy storage, can solve the problems of battery electrical performance degradation, safety degradation, active layer peeling, etc., and achieve the effects of improving thermal shrinkage resistance, mechanical strength, and electrical conductivity.

Inactive Publication Date: 2013-03-13
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the water in the above series of reactions is not consumed, so the reaction can continue, and because the separator is soaked in the electrolyte for a long time, after a long period of reaction, the generated fluoride and reactant oxide The difference in the volume of the lattice will cause the volume change of the inorganic active layer, so that the active layer will fall off from the porous substrate, and the electrical performance of the battery will be attenuated and the safety will be reduced.

Method used

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  • Organic/inorganic composite porous thin film and electrochemical energy storing device using same
  • Organic/inorganic composite porous thin film and electrochemical energy storing device using same
  • Organic/inorganic composite porous thin film and electrochemical energy storing device using same

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1-1. Inorganic / organic composite porous film (BaSO 4 Granules) Preparation:

[0037] Add BaSO in an amount of about 50wt% (solid content measurement) to deionized water 4 The powder (D50=1.5μm) was stirred for 1h, and then an aqueous solution of PAA-PAAS (Polyacrylic acid-Sodium polyacrylate, polyacrylic acid-sodium polyacrylate) with a content of 5wt% in terms of solid content was added (the content of PAA-PAAS in the aqueous solution was 25wt%) %) after stirring for 1 hour, grind in a ball mill for 1 hour, then add a CMC solution with a solid content of 0.5 wt% to the ground slurry, and continue stirring for 1 hour to obtain a slurry. Then use a reverse roll gravure coater to coat the prepared above slurry on a polyethylene microporous film (porosity 45%) with a thickness of 16 μm, the thickness of the active layer is 4 μm, repeat this step to obtain a 4 μm thick The active layer on the other side, that is, the total thickness of the composite porous film is 24 μm. ...

Embodiment 2

[0043] 2-1. Inorganic / organic composite porous film (AlF 3 Granules) Preparation:

[0044] AlF was added to deionized water in an amount of about 50 wt% (solid content measurement) 3 The powder (D50=1μm) was stirred for 1h, and then the PAA-PAAS aqueous solution with a solid content of 5wt% and the aqueous silane coupling agent (3-glycidyl ether propyl triethoxy) with a solid content of 3wt% were added base silane), and stirred for 1 hour, then ground it in a ball mill for 1 hour, then added a CMC solution with a solid content and a content of 1.0 wt% to the ground slurry, and continued to stir for 1 hour to obtain a slurry. After the polypropylene microporous film is pre-treated by corona or other surface treatment methods that can increase the surface tension of the film, the slurry prepared as above is coated on a 20 μm thick film using a precision slit extrusion coater. On the polypropylene microporous film (48% porosity), the thickness of the active layer is 5 μm. Repea...

Embodiment 3

[0047] 3-1. Preparation of inorganic / organic composite porous film (AlPO4)

[0048] AlPO was added to deionized water in an amount of about 50 wt% (solid content measurement) 4 The powder (D50=1.3μm) was stirred for 1h, and then the PAA-PAAS aqueous solution with a solid content of 5wt% and the silane coupling agent (3-glycidyl ether propyl trimethoxy) with a solid content of 3wt% were added. silane), and stirred for 1 hour, then ground in a ball mill for 1 hour, then added a CMC solution with a solid content and a content of 0.5wt% to the ground slurry, and continued to stir for 1 hour to obtain a slurry. Use a reverse roll gravure coater to coat the slurry prepared as above on a polypropylene microporous film (45% porosity) with a thickness of 16 μm, and an active layer with a thickness of 4 μm. Repeat this step to obtain a thickness of 4 μm. The active layer on the other side, that is, the total thickness of the composite porous film is 24 μm. The porosity of the composit...

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Abstract

The invention discloses an organic / inorganic composite porous thin film and an electrochemical energy storing device using the same. The organic / inorganic composite porous thin film comprises a porous organic base material and an active layer attached on the porous organic base material, wherein the active layer comprises inorganic particles and a binder, and the inorganic particles are one or mixture of sulfate, phosphate, metal fluoride and lithium salt. The organic / inorganic composite porous thin film is adopted as an isolating film for the electrochemical energy storing device. Compared with the prior art, the organic / inorganic composite porous thin film takes substances which do not react with hydrofluoric acid as the inorganic particles of the active layer, and therefore, the electrochemical energy storing device adopting the organic / inorganic composite porous thin film has the advantages of good circulating storage performance, high voltage resistance performance and safety performance.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, in particular to an organic / inorganic composite porous film and an electrochemical energy storage device using the film. Background technique [0002] In recent years, the rapid popularization of portable electronic devices such as mobile phones, notebook computers, and tablet computers, and the development of the electric vehicle industry, wind energy, and solar energy industry have all increased the demand for energy storage devices, especially secondary batteries. Among them, lithium-ion batteries have become the focus of research and commercial development due to their high driving voltage and energy density. [0003] The battery cell of a lithium-ion battery is generally composed of a positive electrode sheet, a negative electrode sheet, and a separator spaced between the positive and negative electrode sheets to prevent short circuits. Traditional lithium-ion battery separator...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 蒋治亿张五堂江德顺金婧邓平华贾宝安吴祖钰李进华
Owner CONTEMPORARY AMPEREX TECH CO
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