Composite particles for electrochemical device electrode

Inactive Publication Date: 2017-11-02
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about creating materials that can be used in electrochemical devices. These materials can form a precise and thin film on the electrode and can allow for the injection of electrolytic solution.

Problems solved by technology

However, it is difficult to manufacture a uniform electrochemical device due to migration of the binder or the like.
In addition, in this method, cost is high, a working environment is poor, and a manufacturing apparatus tends to be large.
However, composite particles obtained by the method of Patent Literature 1 contain small particles having a large adhesive force, so that flowability is therefore deteriorated.
Thus, it is difficult to prepare an electrochemical device electrode having a high film thickness precision using these composite particles.
In addition, an electrolytic solution does not easily permeate an electrode obtained using such composite particles, and battery performance such as a capacity is deteriorated when a battery is manufactured using the electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0170](Preparation of Composite Particle Slurry)

[0171]97 parts of artificial graphite (average particle diameter: 24.5 μm, graphite interlayer distance (spacing (d value) of (002) plane by X-ray diffraction method): 0.354 nm) as an electrode active material, 2 parts of an SBR aqueous dispersion (BM400B, glass transition temperature (Tg): −5° C.; manufactured by Zeon Corporation) in terms of a solid content as a binder, 0.5 parts of carboxymethylcellulose (BSH-12; manufactured by DKS Co. Ltd.) (hereinafter also referred to as “CMC”) in terms of a solid content as a water-soluble polymer, and 0.5 parts of a 2% cellulose nanofiber aqueous dispersion (BiNFi-s (NMa-10002), raw material: softwood, polymerization degree: 500; manufactured by Sugino Machine Limited) in terms of a solid content as a water-insoluble polysaccharide polymer fiber were mixed. Ion exchanged water was further added thereto such that the concentration of solid content was 35% by weight. The resulting mixture was mi...

example 2

[0177]A composite particle slurry was prepared and composite particles were manufactured in a similar manner to Example 1 except that the amount of a binder used for preparing the composite particle slurry was changed to 3 parts in terms of a solid content. The cumulative 10% diameter (D10 diameter) of the composite particles in the particle diameter distribution in terms of a volume was 35 μm. Also, the dynamic repose angle was 33°, and the pressure loss of a composite particle layer was 0.5 mbar. In addition, a lithium ion secondary battery electrode was prepared in a similar manner to Example 1 except that these composite particles were used.

example 3

[0178]A composite particle slurry was prepared and composite particles were manufactured in a similar manner to Example 1 except that the amount of a binder used for preparing the composite particle slurry was changed to 0.5 parts in terms of a solid content. The cumulative 10% diameter (D10 diameter) of the composite particles in the particle diameter distribution in terms of a volume was 35 μm. Also, the dynamic repose angle was 24°, and the pressure loss of a composite particle layer was 2 mbar. In addition, a lithium ion secondary battery electrode was prepared in a similar manner to Example 1 except that these composite particles were used.

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PUM

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Abstract

Composite particles for electrochemical device electrodes, which contain an electrode active material and a binder. A composite particle layer formed of the composite particles has a pressure loss of 5.0 mbar or less and a dynamic repose angle of 20° or more and less than 40°.

Description

TECHNICAL FIELD[0001]The present invention relates to composite particles for an electrochemical device electrode.BACKGROUND ART[0002]An electrochemical device such as a lithium ion secondary battery having a small size, a light weight, and a high energy density, and capable of being charged and discharged repeatedly or an electric double layer capacitor is expected to expand demand thereof in the future also due to environmental reasons. The lithium ion secondary battery has a high energy density, and has been utilized in a field of a cellular phone, a notebook type personal computer, or the like. The electric double layer capacitor can be charged and discharged rapidly, and has been utilized as a memory backup small power supply for a personal computer or the like. In addition, a lithium ion capacitor utilizing an oxidation-reduction reaction (pseudo electric double layer capacity) on a surface of a metal oxide or a conductive polymer has attracted attention due to the magnitude o...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01G11/42H01G11/24H01M4/525H01G11/86H01M4/587H01M4/62H01M4/02
CPCH01M10/0525H01G11/24H01G11/42H01G11/86H01M2004/021H01M4/622H01M4/525H01M2220/30H01M4/587H01G11/38H01G11/50H01M4/13H01M4/62
InventorMATSUMURA, TAKU
OwnerZEON CORP