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Inspection method for all-solid secondary battery and manufacturing method of the all-solid secondary battery

A secondary battery and inspection method technology, applied in secondary battery, electrolyte battery manufacturing, solid electrolyte, etc., can solve problems such as electromotive force reduction, and achieve the effect of improving production efficiency

Inactive Publication Date: 2017-02-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is known that when the secondary battery is left after being charged, the electromotive force decreases

Method used

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  • Inspection method for all-solid secondary battery and manufacturing method of the all-solid secondary battery
  • Inspection method for all-solid secondary battery and manufacturing method of the all-solid secondary battery
  • Inspection method for all-solid secondary battery and manufacturing method of the all-solid secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Fabrication of the constituent unit cells

[0084] In order to verify the method and manufacturing method of the present invention, the constituent unit cells used were produced by the following method: making positive electrode compound slurry, negative electrode compound material slurry, solid electrolyte slurry, and using Al foil as a positive electrode current collector The positive electrode material slurry is coated on the surface and dried, the negative electrode material slurry is coated and dried on the Cu foil as the negative electrode current collector, and the solid electrolyte layer is transferred between them and punched. A more specific production method is as follows.

[0085] A. Preparation of positive electrode material slurry

[0086] LiNi with an average particle size D50 of 5 μm will be weighed 0.33 co 0.33 mn 0.33 o 2 (Nichia Chemical Industry) 52g, VGCF (Showa Denko), 17g of sulfide solid electrolyte, binder (PVDF) 2g, and 52g of butyl bu...

Embodiment 2

[0113] In order to verify the production method of the present invention, a self-discharge inspection was performed after the multilayer all-solid secondary battery was produced by the production method of the present invention, and it was confirmed that there was no micro-short circuit in the produced all-solid secondary battery. Specifically, verification was performed by the following method.

[0114] By the method of Example 1, a constituent unit cell was produced. Thereafter, the positive electrode current collector and the negative electrode current collector constituting the unit cell were connected with conductors to make an external short circuit. After the external short circuit was completed, a voltmeter was connected between the positive electrode current collector and the negative electrode current collector constituting the unit cell, and the open circuit voltage 30 seconds after the external short circuit was completed was measured. As a result of the measureme...

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Abstract

The invention provides an inspecting method for an all-solid secondary battery and a manufacturing method utilizing the same of the all-solid secondary battery. A method for inspecting a constituent unit cell of the all-solid secondary battery includes a step of measuring a voltage in advance, namely a step of measuring an open-circuit voltage between the positive electrode and the negative electrode of a constituent unit cell of an all-solid secondary battery; an external short-circuiting step, namely a step of externally short-circuiting the positive electrode and the negative electrode of the constituent unit cell; a voltage measuring step, namely a step of measuring an open-circuit voltage between the positive electrode and the negative electrode of the constituent unit cell after a given time has elapsed since the end of the externally short-circuiting step; and (D) a judging step, namely a step of judging the constituent unit cell to be unusable when the open-circuit voltage measured in voltage measuring step is less than the threshold value. The manufacturing method includes stacking a plurality of the constituent unit cells excluding the constituent unit cell judged to be unusable by the inspection method.

Description

technical field [0001] The present invention relates to an inspection method for an all-solid secondary battery and a method for manufacturing an all-solid secondary battery using the inspection method. Background technique [0002] Currently, among various batteries, lithium ion batteries are attracting attention from the viewpoint of high energy density. Among them, an all-solid secondary battery obtained by substituting an electrolytic solution for a solid electrolyte has attracted attention in particular. The reason is that, unlike secondary batteries using an electrolyte, an all-solid secondary battery does not use an electrolyte, so does not decompose the electrolyte due to overcharging, and has high cycle durability and energy density. [0003] However, it is known that the electromotive force decreases when the secondary battery is left after being charged. One of the causes thereof is self-discharge due to micro-short circuit formed inside the battery or the like....

Claims

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Application Information

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IPC IPC(8): G01R31/36H01M10/058
CPCG01R31/3865H01M10/058H01M10/48H01M2300/0068G01R19/16542G01R31/388H01M10/0525H01M10/0562Y02E60/10Y02P70/50G01R31/385G01R31/378G01R31/396
Inventor 山下勇司
Owner TOYOTA JIDOSHA KK