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Carbon material, positive electrode for all-solid-state batteries, negative electrode for all-solid-state batteries, and all-solid-state battery

A technology of all-solid-state batteries and carbon materials, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, and negative electrodes, can solve the problems of increased resistance of all-solid-state batteries and reduced battery characteristics, so as to reduce useless space and improve electrode performance. Effect of improving density and cycle characteristics

Pending Publication Date: 2020-01-17
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the resistance of the positive electrode or the negative electrode of the all-solid-state battery increases, and battery characteristics such as cycle characteristics decrease in particular.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0100] As the preparation method of the positive electrode for all-solid-state batteries of the present invention, it can be formed after mixing the positive electrode active material, carbon material and solid electrolyte, or it can be formed by mixing the solid electrolyte after preparing the positive electrode active material-carbon material composite. Carbon materials may also be mixed and molded after preparation of the positive electrode active material-solid electrolyte composite.

[0101] The cathode active material-carbon material composite is prepared, for example, in the following procedure.

[0102] First, a dispersion liquid obtained by dispersing the carbon material of the present invention in a solvent (hereinafter referred to as a carbon material dispersion liquid) is prepared. Then, a dispersion liquid of a positive electrode active material obtained by dispersing the positive electrode active material in a solvent (hereinafter referred to as a dispersion liqu...

manufacture example 1

[0158] First, a mixture of 16 g of expanded graphite, 0.48 g of carboxymethyl cellulose, and 530 g of water was irradiated with ultrasonic waves for 5 hours by an ultrasonic treatment device, and then 80 g of polyethylene glycol was added and mixed for 30 minutes with a homomixer to prepare a raw material combination. thing.

[0159] It should be noted that, as the expanded graphite, a trade name "PF POW DER 8F" (BET specific surface area = 22 m 2 / g). Carboxymethylcellulose was manufactured by ALDRICH (average molecular weight=250000). Polyethylene glycol was used under the trade name "PG600" manufactured by Sanyo Chemical Industry Co., Ltd. "UH-600SR" was used for the ultrasonic treatment device manufactured by SMT.CO., LTD. In addition, the homogenizer was used by TOKUSHU KIKA Manufactured model "T.K.HOMOMI XER MARK II."

[0160] Next, water was removed by heat-treating the prepared raw material composition at 150°C. Thereafter, the composition from which water was remo...

manufacture example 2

[0170] First, the powder of expanded graphite (manufactured by Toyo Tanso Co., Ltd., trade name "PFPOWDER 8F," BET specific surface area=22m 2 / g, average particle diameter = 10 μm) 6 g, 0.2 g of carboxymethylcellulose sodium salt, 200 g of water, and 6 g of polyethylene glycol were mixed for 30 minutes to prepare a raw material composition.

[0171] In addition, the carboxymethylcellulose sodium salt was manufactured using the ALDRICH company (average molecular weight=250000). Polyethylene glycol was used under the trade name "PG600" manufactured by Sanyo Chemical Industry Co., Ltd. "T.K.HOMOMIXER MAR K II" manufactured by TOKUSHU KIKA was used as the homogenizer.

[0172] Next, water was removed by heat-treating the prepared raw material composition at 150°C. Thereafter, the composition from which water was removed was heat-treated at a temperature of 370° C. for 1 hour to prepare a carbon material in which a portion of polyethylene glycol remained.

[0173] Finally, by hea...

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PUM

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Abstract

Provided is a carbon material which is capable of improving the cycle characteristics of an all-solid-state battery during charge and discharge of the all-solid-state battery. A carbon material whichis contained in a positive electrode and / or a negative electrode for all-solid-state batteries using a solid electrolyte that has group 1 or group 2 ion conductivity, and wherein the ratio of the maximum peak height a within the 2theta range of from 24 degrees (inclusive) to 28 degrees (exclusive) to the maximum peak height b within the 2theta range of from 28 degrees (inclusive) to 30 degrees (exclusive), namely a / b is from 0.2 to 10.0 (inclusive) if the X-ray diffraction spectrum of a mixture of the carbon material and Si is measured, said carbon material and Si being mixed at a weight ratioof 1:1.

Description

technical field [0001] The present invention relates to a carbon material, a positive electrode for an all-solid battery, a negative electrode for an all-solid battery, and an all-solid battery using the carbon material. Background technique [0002] In recent years, research and development of non-aqueous electrolyte secondary batteries have been actively carried out for use in portable devices, hybrid vehicles, electric vehicles, and household power storage applications, and further higher energy density is required. [0003] As an example of the non-aqueous electrolyte secondary battery, there is known a solution using a liquid organic electrolyte obtained by dissolving a lithium salt in a flammable organic solvent. However, in a system using a liquid organic electrolyte, there is a problem that the organic electrolyte leaks from the battery or catches fire when short-circuited, and further improvement in safety is required. [0004] To meet this demand, an all-solid-sta...

Claims

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Application Information

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IPC IPC(8): H01M10/0562C01B32/182C01B32/225H01M4/133H01M4/62H01M10/0565H01M4/131
CPCH01M4/133H01M10/0562C01B32/182C01B32/225Y02E60/10H01M4/587H01M4/386H01M4/625H01M4/364H01M2300/0071H01M2300/0068H01M4/13H01M10/052C01P2006/40C01P2002/72C01P2002/82H01M4/134H01M10/0565H01M2004/027H01M2004/028
Inventor 泽田裕树增田浩树中寿贺章藤原昭彦
Owner SEKISUI CHEM CO LTD
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