Method for producing collector for electrochemical elements, method for producing electrode for electrochemical elements, collector for electrochemical elements, electrochemical element, and coating liquid for forming collector for electrochemical elements

A technology of electrochemical components and manufacturing methods, which is applied in the direction of electrode collector coating, non-aqueous electrolyte battery electrodes, and electrode manufacturing, which can solve the problems of low conductivity and achieve the effect of low internal resistance

Active Publication Date: 2014-12-24
DAINICHISEIKA COLOR & CHEM MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, for example, in the positive electrode of a lithium secondary battery, the electrode active material generally used at present has low conductivity, so conductive particles such as carbon materials are added to prepare an electrode mixture (mixed material)

Method used

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  • Method for producing collector for electrochemical elements, method for producing electrode for electrochemical elements, collector for electrochemical elements, electrochemical element, and coating liquid for forming collector for electrochemical elements
  • Method for producing collector for electrochemical elements, method for producing electrode for electrochemical elements, collector for electrochemical elements, electrochemical element, and coating liquid for forming collector for electrochemical elements
  • Method for producing collector for electrochemical elements, method for producing electrode for electrochemical elements, collector for electrochemical elements, electrochemical element, and coating liquid for forming collector for electrochemical elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0148] According to the formula shown in Table 1, the raw materials were put into a dissolving mixer, and mixed at a speed of 300 rpm for 10 minutes. Next, a homogenizer (manufactured by Iada Trading Co., Ltd., product name PRO200) was used to process at 20,000 rpm for 30 seconds to obtain a coating layer coating liquid in which carbon particles and the like were uniformly dispersed in the dispersion medium. Also, in Table 1, the sum of the amounts of the carbon particles (A), the binder (B), the crosslinking agent (C) and the dispersion medium is 100 parts by mass.

[0149] An aluminum foil having a thickness of 30 μm made of an alkali-washed A1085 material was prepared.

[0150] Using an applicator, the above-mentioned coating layer coating solution was applied to both sides of the aluminum foil by a casting method. Thereafter, heat treatment was carried out at 180° C. for 3 minutes, and drying was performed to obtain current collectors 1 to 10 provided with coating layers....

Embodiment 11～20、 comparative example 2

[0162] The current collectors obtained in Examples 1 to 10 and Comparative Example 1 were cut out into a size of 10 cm×10 cm. 95 parts by mass of lithium cobaltate (manufactured by Nippon Chemical Industry Co., Ltd., trade name Celshid C), 2 parts by mass of acetylene black (manufactured by Denka Kogyo Co., Ltd., Denka Black (powder)), polyvinylidene fluoride (Co., Ltd. 3 parts by mass of KF Polymer #1120 manufactured by KLEHA Co., Ltd., and 95 parts by mass of N-methyl-2-pyrrolidone (industrial grade) were mixed to obtain a slurry. This slurry was applied to both surfaces of the cut-out current collector. Thereafter, it was dried and pressed to form a positive electrode active material layer with a thickness of 50 μm on one side, which was used as a positive electrode.

[0163] On the other hand, 94 parts by mass of artificial graphite (manufactured by Showa Denko Co., Ltd., trade name SCMG-AR), 1 mass part of acetylene black (manufactured by Denka Kogyo Co., Ltd., trade name ...

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Abstract

The purpose of the present invention is to provide a method for producing a collector for electrochemical elements, said collector having low internal resistance and enabling quick charging. A method for producing a collector for electrochemical elements according to the present invention comprises a step wherein a coating layer is formed on a metal foil by applying a coating liquid, which contains a divalent or higher-valent organic acid or a derivative thereof, carbon particles, an organic solvent, and at least one substance that is selected from the group consisting of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl starch, hydroxypropyl starch, dextrin, pullulan, dextran, guar gum and hydroxypropyl guar gum, onto the metal foil and then removing the organic solvent.

Description

technical field [0001] The present invention relates to a method for producing a current collector for electrochemical elements, a method for producing electrodes for electrochemical elements, a current collector for electrochemical elements, an electrochemical element, and a coating solution for producing a current collector for electrochemical elements . Background technique [0002] As an example of an electrochemical element, lithium secondary batteries are currently used in applications such as mobile phones, notebook computers, and video cameras due to their high energy density. Small and medium-sized lithium-ion batteries generally use lithium cobalt oxide or lithium manganese oxide as the positive electrode active material, and graphite as the negative electrode. [0003] The positive electrode of a general lithium secondary battery is composed of lithium cobaltate or lithium manganate as a positive electrode active material, and carbon particles having electron con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01G11/66H01M4/13H01M4/139H01M4/64H01M4/04
CPCH01G11/28H01G11/68H01M4/13H01M4/139H01M4/661H01M4/667C09D101/28C09D101/284C09D103/08C09D105/00C09D105/02Y02E60/10C08L1/02H01M4/0404H01M4/806H01M10/0525H01M2220/30H01M2220/20Y02E60/13H01M4/0402H01M4/663
Inventor 新井良和小林诚幸土居诚司横内仁大森将弘
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD
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