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Electrode for electrochemical element

A technology of electrochemical components and chemical components, applied in electrical components, battery electrodes, hybrid capacitor electrodes, etc., can solve the problem of organic solvents requiring expensive organic solvents and so on

Inactive Publication Date: 2014-07-02
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, on the other hand, the method of using organic-based slurries has the problems of the cost of recycling organic solvents and ensuring the safety of using organic solvents. Therefore, in order to solve these problems, research has been carried out on water-based slurries used in water-based slurries. Adhesive

Method used

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  • Electrode for electrochemical element
  • Electrode for electrochemical element
  • Electrode for electrochemical element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0305]

[0306] 100 parts of carbon black with a volume average particle diameter of 0.7 μm, and 4 parts of solid content as a 4.0% aqueous solution of carboxymethylcellulose ammonium salt as a dispersant (DN-10L; manufactured by Daicel Chemical Industry Co., Ltd. ), an acrylate polymer (2-ethylhexyl acrylate: acrylonitrile=75:25 (mass ratio)) having an average particle diameter of 0.25 μm as a resin component (binder) as a solid content of 8 parts 40% aqueous dispersion, and ion-exchanged water to make the total solid content concentration 30% were mixed to prepare a slurry for forming a conductive adhesive layer.

[0307]

[0308] Mix 100 parts of graphite as the negative electrode active material, solid content is counted as the styrene-butadiene copolymer (BM-480B, glass transition temperature-15 ℃ of 2 parts of binder) 40% water dispersion, the solid content is 0.8% aqueous solution (BSH-2; Daiichi Kogyo Pharmaceutical Co., Ltd. manufacture) of the carboxymethylcellul...

Embodiment 2

[0322] When producing negative electrodes using composite particles for negative electrodes and copper foil with a conductive binder layer formed, the composition Figure 5The roller pressure (linear pressure) of the rollers 6A and 6B of the extrusion molding roller 6 of the electrode forming device 2 shown is 20kN / m, and the roller pressure (linear pressure) of the rollers 8A and 8B constituting the extrusion molding roller 8 is 250kN / m. m, except that, a negative electrode was obtained in the same manner as in Example 1, and a lithium ion secondary battery was produced using the obtained negative electrode, and evaluated in the same manner. The results are shown in Table 1.

Embodiment 3

[0324] When producing negative electrodes using composite particles for negative electrodes and copper foil with a conductive binder layer formed, the composition Figure 5 The roller pressure (linear pressure) of the rollers 6A and 6B of the extrusion molding roller 6 of the electrode forming device 2 shown is 3kN / m, and the roller pressure (linear pressure) of the rollers 8A and 8B constituting the extrusion molding roller 8 is 750kN / m. m, except that, a negative electrode was obtained in the same manner as in Example 1, and a lithium ion secondary battery was produced using the obtained negative electrode, and evaluated in the same manner. The results are shown in Table 1.

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Abstract

Provided is an electrode for an electrochemical element, equipped with an electrode active material layer containing an electrode active material and a binder, wherein the electrode for the electrochemical element is equipped with: binder-covered portions (220) in which at least some of the surfaces of the electrode active material (210) are covered by the binder; and binder-linked portions (230) in which the binder-covered portions (220) formed on a plurality of surfaces of the electrode active material (210) that form a plurality of void portions (240) constituted of the electrode active material (210) are linked to one another by the binder, within the void portions (240).

Description

technical field [0001] The present invention relates to electrodes for electrochemical elements. Background technique [0002] Due to these characteristics, demand for electrochemical devices such as lithium-ion secondary batteries, which are small, lightweight, have high energy density, and can be repeatedly charged and discharged, is rapidly increasing. Due to its high energy density, lithium-ion secondary batteries are; used in notebook computers or notebook computers, electric vehicles and other fields. [0003] The electrodes constituting the electrochemical element are usually produced by coating a slurry containing a binder, an electrode active material, and a solvent on a current collector such as metal foil, and then removing the solvent. As the slurry for constituting the electrode of the electrochemical element, an organic slurry in which a fluororesin such as polyvinylidene fluoride (PVDF) is used as a binder and an organic solvent such as N-methyl-pyrrolidone (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/139H01G9/00H01G11/22H01G13/00
CPCH01G11/28H01G11/06H01M4/622H01M4/366H01G11/50H01G11/38H01M4/139H01M4/621Y02T10/7022Y02E60/13Y02E60/122H01G11/24H01G11/86Y02E60/10Y02T10/70
Inventor 一色康博藤井勉石井琢也松村卓大谷佑子柴田佑二大西和幸
Owner ZEON CORP
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