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Composite particles for electrochemical element electrode, manufacturing method for composite particles for electrochemical element electrode, electrochemical element electrode, and electrochemical element

A technology of electrochemical elements and composite particles, applied in the field of electrochemical elements, can solve the problems of weak strength, difference, and weak adhesion.

Active Publication Date: 2015-10-07
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for such composite particles, their strength is weak, and they may be destroyed when they are transferred by air transport, etc.
However, when the composite particles that have been destroyed are used to form the electrode active material layer, the fluidity of the powder will deteriorate due to the loss of uniformity of the particle size of the composite particles, and a uniform electrode active material layer cannot be formed.
In addition, the adhesion between the composite particles and the adhesion between the electrode active material layer and the current collector are weakened, and the cycle characteristics of the resulting electrochemical device are insufficient.
[0006] Furthermore, in Patent Document 1, externally added particles in which the surface of the composite particles is coated with a fibrous conductive additive are obtained, but the strength of the composite particles cannot be improved.
[0007] In addition, in Patent Document 2, in order to improve the adhesiveness in the coated electrode, it is described that the slurry for coating the electrode used to coat the electrode to form the electrode layer contains carbon fibers, but since it involves Unlike the manufacturing method of the coated electrode using powder molding of composite particles, it does not describe the content of improving the strength of composite particles

Method used

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  • Composite particles for electrochemical element electrode, manufacturing method for composite particles for electrochemical element electrode, electrochemical element electrode, and electrochemical element

Examples

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Effect test

Embodiment 1

[0168] (Manufacture of adhesive resin)

[0169] Add 47 parts of styrene, 50 parts of 1,3-butadiene, 3 parts of methacrylic acid, 4 parts of sodium dodecylbenzenesulfonate, and 150 parts of ion-exchanged water into a 5MPa pressure-resistant container with a stirrer. 0.4 parts of t-dodecylmercaptan as a transfer agent and 0.5 parts of potassium persulfate as a polymerization initiator were sufficiently stirred, and then heated to 50° C. to initiate polymerization. When the polymerization conversion rate reached 96%, cooling was performed to stop the reaction, and a particulate binder resin (styrene-butadiene copolymer; hereinafter also abbreviated as "SBR") was obtained.

[0170] (Manufacture of slurry for composite particles)

[0171] 96.5 parts of artificial graphite (average particle diameter: 24.5 μm, distance between graphite layers (interplanar distance (d value) of (002) plane measured based on X-ray diffraction method): 0.354 nm) as a negative electrode active material,...

Embodiment 2

[0183] As the negative electrode active material, except that 90 parts of artificial graphite and 6.5 parts of SiC were used in combination, the manufacture of the slurry for composite particles, the manufacture of composite particles, and the negative electrode for lithium ion secondary battery were carried out in the same manner as in Example 1. Manufacturing of lithium-ion secondary batteries.

Embodiment 3

[0185] As the water-insoluble polysaccharide polymer fibers, a 2% aqueous dispersion of chitin nanofibers (BiNFi-s (SFo-10002), fiber diameter 20 nm, polymerization degree 300; manufactured by Sugino Machine Co., Ltd.) was used. Production of the slurry for composite particles, production of composite particles, production of negative electrodes for lithium ion secondary batteries, and production of lithium ion secondary batteries were performed in the same manner as in Example 1.

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Abstract

The objectives of the present invention are to provide composite particles for an electrochemical element electrode having sufficient strength and enabling sufficient adhesion when forming an electrode, and a manufacturing method for the composite particles for an electrochemical element electrode, and further to provide an electrochemical element electrode and an electrochemical element using said composite particles for an electrochemical element electrode. The composite particles for an electrochemical element electrode are characterized by containing a negative electrode active material, a binder resin, a water-soluble polymer, and non water-soluble polysaccharide polymer fibers, and the manufacturing method for the composite particles for an electrochemical element electrode is characterized by comprising: a step for obtaining a slurry for composite particles by dispersing, in a solvent, a negative electrode active material, a binder resin, a water-soluble polymer and non water-soluble polysaccharide polymer fibers; and a step for spray drying and then granulating the slurry for the composite particles.

Description

technical field [0001] The present invention relates to composite particles for electrochemical element electrodes, a method for producing composite particles for electrochemical element electrodes, electrochemical element electrodes, and electrochemical elements. Background technique [0002] Electrochemical components such as lithium-ion secondary batteries, electric double-layer capacitors, and lithium-ion capacitors are small, lightweight, have high energy density, and can be repeatedly charged and discharged. The effective use of these characteristics has rapidly expanded their demand. Lithium-ion secondary batteries have been used in the mobile field such as mobile phones and notebook personal computers because of their high energy density. On the other hand, electric double layer capacitors have been used as small power sources for backup storage of personal computers and the like because they can be rapidly charged and discharged. In addition, electric double layer c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01G11/30H01M4/133H01M4/134H01M4/1393H01M4/1395
CPCH01G11/86H01G11/38H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/62Y02E60/122Y02E60/13H01G11/06H01G11/28H01G11/50H01M4/13H01M4/622H01M10/0525Y02E60/10Y02T10/70
Inventor 石井琢也
Owner ZEON CORP