Method of manufacturing negative electrode for solid-state battery, method of manufacturing solid-state battery, and negative electrode slurry

A manufacturing method and technology for solid-state batteries, which are applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem of inability to take into account the suppression of sulfide-based solid electrolytes, capacity deterioration, and insufficient adhesion between current collectors and electrode layers, etc. problem, to achieve the effect of suppressing capacity deterioration and suppressing deterioration

Active Publication Date: 2016-02-03
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the present inventors conducted intensive studies, they found that in the case of using such a three-component system binder, the capacity of the battery decreases at the time of initial charging.
[0005] In addition, as in the past, when polyvinylidene fluoride or a three-component copolymer of VDF, HFP, and TFE is used as a binder, the adhesive force between the current collector and the electrode layer is insufficient, and in In the manufacture of solid batteries, peeling and cracking sometimes occur in electrodes
[0006] As described above, in the past, when manufacturing the negative electrode of a solid battery, it was not possible to simultaneously suppress the deterioration of the sulfide-based solid electrolyte, ensure sufficient adhesion between the current collector and the electrode layer, and suppress the capacity caused by the negative electrode. deterioration

Method used

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  • Method of manufacturing negative electrode for solid-state battery, method of manufacturing solid-state battery, and negative electrode slurry
  • Method of manufacturing negative electrode for solid-state battery, method of manufacturing solid-state battery, and negative electrode slurry
  • Method of manufacturing negative electrode for solid-state battery, method of manufacturing solid-state battery, and negative electrode slurry

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Experimental program
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Embodiment

[0080] 1. Issues with conventional adhesives

[0081] When using a copolymer containing a three-component system of VDF monomer unit, TFE monomer unit and HFP monomer unit as a binder to make a negative electrode, and using the negative electrode to make a solid battery and charge and discharge, the initial charge is at 3V A plateau caused by side reactions was observed nearby, and the capacity of the battery decreased. When intensive research was carried out, it was presumed that the TFE component contained in this binder was reductively decomposed at the time of initial charging. Therefore, application to an adhesive of a two-component system containing VDF and HFP except for the TFE component has been attempted.

[0082] 2. Preparation of negative electrode

[0083] 2.1. Preparation of binder solution

[0084] pass figure 1 The procedure shown in , prepare the binder solution. details as follows.

preparation example 1

[0085] (Preparation Example 1) Powder of polyvinylidene fluoride (PVDF, VDF 100%) was added to butyl methacrylate (manufactured by Kishida Chemical Co., Ltd.), and stirred overnight to prepare a binder solution (1). Here, the whole of the binder solution (1) was regarded as 100% by mass, and it was operated so as to contain 20% by mass of the binder. Note that, since PVDF cannot be dissolved and dispersed in butyl butyrate, butyl methacrylate was used instead of butyl butyrate as a solvent for the binder solution.

preparation example 2

[0086] (Preparation Example 2) A binder powder of a three-component system prepared by copolymerization at a ratio of VDF:TFE:HFP=55 mol%:25 mol%:20 mol%, was added to butyl butyrate (Kishida Chemical Co., Ltd. Co., Ltd.) was stirred overnight to dissolve the binder to prepare a binder solution (2). Here, the whole of the binder solution (2) was regarded as 100% by mass, and it was operated so as to contain 5% by mass of the binder.

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Abstract

The invention relates to a method of manufacturing a negative electrode for a solid-state battery, a method of manufacturing a solid-state battery, and negative electrode slurry. Provided is a method of manufacturing a negative electrode for a solid-state battery, the method including: a step of mixing a negative electrode active material, a sulfide solid electrolyte, a binder, and a solvent with each other to prepare a negative electrode slurry; a step of applying the prepared negative electrode slurry to a surface of a solid electrolyte layer of the solid-state battery or a substrate of the negative electrode; and a step of drying the applied negative electrode slurry. In this method, the solvent is butyl butyrate, and the binder is a copolymer containing a vinylidene fluoride (VDF) monomer unit and a hexafluoropropylene (HFP) monomer unit, in which a molar ratio of the HFP monomer unit to a total amount of the VDF monomer unit and the HFP monomer unit is 10% to 25%.

Description

technical field [0001] The present invention relates to a method for manufacturing a negative electrode for a solid battery, a method for manufacturing a solid battery, and a slurry for a negative electrode. Background technique [0002] A solid-state battery is known as one type of battery excellent in safety. A solid battery includes electrodes containing an active material and the like, and a solid electrolyte layer serving as a separator layer between the electrodes. Such an electrode and a solid electrolyte layer can be easily produced using a slurry obtained by dispersing an active material, a solid electrolyte, and the like in a solvent. For example, as described in Japanese Unexamined Patent Publication No. 2013-118143, a slurry is prepared by mixing an electrode active material, a sulfide-based solid electrolyte, a binder, and a solvent, the slurry is applied, and then dried. process, a desired electrode layer can be obtained. [0003] In the past, polyvinylidene...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/623H01M4/0404H01M10/0525H01M10/0562Y02E60/10Y02P70/50
Inventor 桥本裕一渡边圭介长泽善幸
Owner TOYOTA JIDOSHA KK
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