Degassing method for electrode paste

A technology for electrode paste and degassing, applied in separation methods, liquid degassing, electrode manufacturing, etc., can solve problems such as stripe defects

Active Publication Date: 2016-08-31
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, streaking defects may appear during application

Method used

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  • Degassing method for electrode paste
  • Degassing method for electrode paste
  • Degassing method for electrode paste

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no. 1 approach

[0020] A specific embodiment to which the present invention is applied will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. For clarity of explanation, the following description and drawings are appropriately simplified.

[0021] reference Figure 1 to Figure 3 , describes a nonaqueous electrolyte secondary battery made using an electrode paste that has been degassed by the electrode paste degassing method according to the first embodiment of the present invention. In this embodiment, a lithium ion secondary battery is explained as an example of a nonaqueous electrolyte secondary battery. figure 1 is a schematic overall view of a configuration example of a nonaqueous electrolyte secondary battery. figure 2 is a schematic cross-sectional view of an electrode layered body. image 3 is a schematic cross-sectional view of the electrode.

[0022] By housing the electrode layered body 30...

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Abstract

Provided is a degassing method for an electrode paste that introduces the electrode paste formed by kneading a solid content containing an electrode active material and a dispersion medium into a decompressed container and degassing the electrode paste while a shear force is applied to the electrode paste. A ratio of the solid content in the electrode paste is set to be 55 mass% or more, and a pressure in the decompressed container is set to be -50 kPa or more. It is possible to suppress both remaining bubbles and dry of the electrode paste, thus enhancing a product yield.

Description

technical field [0001] The invention relates to a method for degassing electrode paste. Background of the invention [0002] A lithium ion secondary battery is a nonaqueous electrolyte secondary battery that can be charged-recharged by the movement of lithium ions in the nonaqueous electrolyte between a positive electrode and a negative electrode that store and discharge lithium ions. Large-capacity lithium-ion secondary batteries have recently been installed in electric vehicles (EV) and plug-in hybrid vehicles (PHV). [0003] The negative electrode and the positive electrode of the lithium ion secondary battery described above each have a layered structure in which an active material layer is formed on a current collector. Forming active The layer of material is thereafter pressed. [0004] Generally, the above electrode paste is produced by mixing solid contents such as active material, binder and thickener and then kneading the resulting powder mixture and dispersion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04
CPCH01M4/04H01M4/139H01M4/0404H01M4/88B01D19/0036B01D19/0057H01M4/043Y02E60/50Y02E60/10B01D19/0042B01D19/0031
Inventor 杉原敦史中岛雅夫下园雄二后藤英史
Owner TOYOTA JIDOSHA KK
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