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Electrochemical battery using multicomponent composite membrane

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve problems such as unsatisfactory anti-ionic conductivity, plasticizer environmental hazards, weakening the interface bond strength between the porous polymer layer and the gellable layer, etc.

Inactive Publication Date: 2003-11-19
LG CHEM LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material is twisted and stretched, and finally forms a "dog bone" shaped battery. Similarly, the problems encountered in the rubber roller structure: peeling, cracking, and disintegration often occur in this structure, and, with The battery itself of this structure is easy to break
U.S. Patent No.5631103 and No.5849433 provide the method that uses low molecular weight plasticizer (such as dibutyl phthalate) to improve the ionic conductivity of separator, but plasticizer is harmful to environment, and makes battery batch Production is difficult
[0016] In addition, the multilayer composite membrane prepared as described above is a dense gelled polymer that can be non-porous, which undesirably increases its resistance to ion conductivity and weakens the porous polymer layer and the gellable layer. The interfacial bond strength between

Method used

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  • Electrochemical battery using multicomponent composite membrane
  • Electrochemical battery using multicomponent composite membrane
  • Electrochemical battery using multicomponent composite membrane

Examples

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preparation example Construction

[0073] The preparation method of the multi-component composite membrane in the present invention is: coating the above-mentioned gelatable polymer solution on the carrier layer film, forming a gelled polymer layer on one side or both sides of the carrier layer, by pulling Stretching, micropores are formed on the carrier layer and the gellable layer, and finally the carrier layer and the gellable layer are tightly bonded into one body, and there is no interface between them.

[0074] More specifically, the preparation of the multi-component composite membrane is carried out according to the following steps.

[0075] a) providing a polymeric carrier layer film;

[0076] b) dissolving the gellable polymer in a solvent to prepare a gellable polymer solution;

[0077] c) coating the solution obtained in step b) on the carrier layer film a), to form a gelable polymer layer on one or both sides of the carrier layer film, a multi-layer film;

[0078] d) Stretching the multilayer fil...

Embodiment 1

[0117] Preparation of a stacked cell in which a complete cell serves as a basic unit

[0118] (Preparation of positive electrode)

[0119] LiCoO 2 , carbon black, and PVDF (polyvinylidene fluoride) are dispersed in 1-methyl-2-pyrrolidone at a weight ratio of 95:2.5:2.5 to prepare a slurry, and coat the slurry on both sides of the aluminum foil , fully dried at 130°C, and then pressed to obtain a positive electrode with a thickness of 115 microns

[0120] (Preparation of Negative Electrode)

[0121] Graphite, acetylene black, and PVDF are dispersed in 1-methyl-2-pyrrolidinone at a weight ratio of 93:1:6 to prepare a slurry, which is coated on both sides of copper foil and heated at 130°C fully dried under the sun, and then laminated to obtain a negative electrode with a thickness of 120 microns

[0122] (Preparation of multi-component composite membrane)

[0123] Using high crystalline polypropylene as the matrix material, the melt index is 2.0 g / 10 minutes, the density is...

Embodiment 2

[0138] Fabrication of stacked batteries with dual single cells as basic units

[0139] (Preparation of positive electrode)

[0140] The preparation method of positive pole is identical with example 1;

[0141] The positive electrode placed inside the dual cell battery is prepared by coating the slurry on both sides of the aluminum foil, that is, there are active positive electrode materials on both sides of the aluminum positive current collector plate. The thickness of the positive electrode is 140 microns;

[0142] (Preparation of Negative Electrode)

[0143] The preparation method of negative pole is identical with example 1;

[0144] The negative electrode is the outermost of the complete single battery placed on the outermost side, and is made by coating the active negative electrode material on both sides of the copper negative current collector plate. The negative electrode placed on the inside is made by coating the active negative electrode material on both sides ...

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Abstract

The present invention provides a electrochemical element, wherein a multi-component composite film comprising a) polymer support layer film and b) a porous gellable polymer layer which is formed on either or both sides of the support layer film of a), wherein the support layer film of a) and the gellable polymer layer of b) are unified with each other without an interface between them.

Description

technical field [0001] The present invention relates to an electrochemical cell, in particular to an electrochemical cell with improved energy density, comprising a multi-component electrochemical single cell stacked with multi-component composite films, wherein the multi-component composite film is bonded Bonded, there is no interface between the carrier layer membrane and the porous gelable polymer layer. Background technique [0002] In recent years, energy storage technology has attracted more and more people's attention, and the application fields of batteries have also been expanded to mobile phones, digital cameras, notebook computers and other fields, and recently extended to the field of electric vehicles. The rapid expansion of battery application fields has aroused people's in-depth research on batteries, and has achieved remarkable results. The study of electrochemical batteries has been one of the areas of interest, the central f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/10B01D67/00B01D69/12C08K3/22C08L101/00H01M6/22H01M8/02H01M8/10H01M10/05H01M10/0567H01M10/0568H01M50/417H01M50/42H01M50/423H01M50/426H01M50/491
CPCY02E60/12B01D69/12B01D67/0013B01D2325/04H01M2/14H01M10/0525B01D2325/26B01D67/0083B01D67/009H01M10/0585B01D67/0027B01D67/0025H01M2/1653H01M10/0565Y02E60/10H01M50/417H01M50/491H01M50/42H01M50/423H01M50/426Y02P70/50H01M50/449H01M4/131H01M4/133B01D69/1213B01D69/1216
Inventor 李承璡李香穆安谆昊赵真衍龙贤姮李炯根李相英宋宪植安秉寅朴谆龙庆有真
Owner LG CHEM LTD
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