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Manufacturing method of electrode, and battery

A manufacturing method and electrode technology, which are applied in electrode manufacturing, electrode collector coating, battery electrodes, etc., can solve problems such as increased viscosity of electrode mixture and coating defects.

Inactive Publication Date: 2013-12-18
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when a shear force is applied to the electrode mixture, it may occur that the viscosity of the electrode mixture increases and leads to coating defects (dilation)

Method used

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  • Manufacturing method of electrode, and battery
  • Manufacturing method of electrode, and battery

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preparation example Construction

[0028] According to the preparation steps of the positive electrode, first, the positive electrode active material is dispersed in a solvent together with a conductive auxiliary agent, a binder, etc. by using a kneader such as a biaxial continuous kneader or a planetary mixer to prepare a positive electrode mixture paste. Then, the cathode mixture is coated on the surface of the cathode current collector by using a coater such as a die coater, followed by drying. Finally, a positive electrode mixture layer was formed on the surface of the positive electrode current collector by applying a pressing method on the positive electrode mixture coated on the surface of the positive electrode current collector.

[0029] The preparation step of the negative electrode is a method of manufacturing the electrode related to the embodiment of the present invention. Such as figure 1 As shown in , the preparation steps of the negative electrode include kneading step S11, coating step S12 and...

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Abstract

An electrode includes a current collector formed in a sheet and an electrode mixture layer formed on the surface of a current collector. An electrode mixture containing an active material is prepared by using a kneading machine. The electrode mixture on a surface of the current collector is coated. The electrode mixture coated on the current collector is pressed to form the electrode mixture layer on the surface of the current collector. A first thickener and a second thickener are added to the active material when the electrode mixture is prepared. A 1% by weight aqueous solution of the first thickener has the viscosity of equal to or larger than 5000 and equal to or smaller than 9000 mPas. A 1% by weight aqueous solution of the second thickener has the viscosity of equal to or larger than 2000 and equal to or smaller than 5000 mPas.

Description

technical field [0001] The invention relates to a manufacturing method of an electrode and a battery, especially a technique for preparing an electrode mixture. Background technique [0002] Batteries (such as lithium ion secondary batteries) having an electrode body obtained by winding a pair of electrodes (a positive electrode and a negative electrode) are widely known. The pair of electrodes is formed in a sheet shape with a separator stack interposed between them. [0003] The electrodes of this battery are prepared by coating an electrode mixture paste on the surface of a current collector. In electrode mixtures containing binders and thickeners, aggregates may form. The electrode mixture in which aggregates are formed is difficult to be uniformly coated on the surface of the current collector, and may cause coating defects. [0004] Japanese Patent Application Publication No. 2009-099441 (JP2009-099441A) discloses a technique in which, when preparing an electrode mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/62
CPCH01M4/043H01M4/0404H01M4/139Y02E60/10H01M4/13
Inventor 上薗知之
Owner TOYOTA JIDOSHA KK
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