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Composite particles for electrodes of electrochemical devices

A technology for electrochemical components and composite particles, which is applied in the direction of electrical components, battery electrodes, hybrid capacitor electrodes, etc., can solve the problem that composite particles are not recorded, and achieve the effect of excellent flexibility and sufficient adhesion

Active Publication Date: 2020-01-21
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since it relates to the manufacturing method of the above-mentioned coated electrode, which is different from powder molding using composite particles, there is no description on improving the strength of composite particles.

Method used

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  • Composite particles for electrodes of electrochemical devices
  • Composite particles for electrodes of electrochemical devices

Examples

Experimental program
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Effect test

Embodiment 1

[0179] (Manufacture of particulate binder resin (B))

[0180] 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, as After sufficiently stirring 0.4 parts of t-dodecylmercaptan as a chain transfer agent and 0.5 parts of potassium persulfate as a polymerization initiator, they were heated to 50° C. to initiate polymerization. Cooling was performed when the polymerization conversion ratio reached 96% to terminate the reaction to obtain a particulate binder resin (B) (styrene-butadiene copolymer; hereinafter also abbreviated as "SBR").

[0181] (Manufacture of slurry for composite particles)

[0182] As the negative electrode active material (A), 91.0 parts of artificial graphite (average particle diameter: 24.5 μm, graphite layer spacing (interplanar spacing (d value) of (002) plane measured by X-ray diffraction me...

Embodiment 2

[0194] Except that 97.6 parts of artificial graphite was used as the negative electrode active material (A), the manufacture of the slurry for composite particles, the manufacture of composite particles, the manufacture of negative electrodes for lithium ion secondary batteries, and the manufacture of lithium ion secondary batteries were carried out in the same manner as in Example 1. Manufacture of ion secondary batteries.

Embodiment 3

[0196] In addition to using a 1.0% aqueous dispersion of cellulose nanofibers as the water-insoluble polysaccharide polymer fiber (D) (raw material: conifer, degree of fibrillation: high, average degree of polymerization 300; manufactured by Chuetsu Pulp Co.), and 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 invention relates to a composite particle for an electrode of an electrochemical element, which comprises: a negative electrode active material (A), a particulate binder resin (B), a water-soluble polymer (C) and a water-insoluble polysaccharide polymer fiber (D) , wherein the content ratio of the water-soluble polymer (C) and the water-insoluble polysaccharide polymer fiber (D) is (C) / (D)=0.2-18 by weight ratio.

Description

technical field [0001] The present invention relates to composite particles for electrochemical element electrodes. Background technique [0002] Electrochemical devices 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 demand for these features is rapidly expanding. Lithium-ion secondary batteries have been used in mobile fields such as mobile phones and notebook personal computers because of their high energy density. On the other hand, since electric double layer capacitors can be quickly charged and discharged, they are expected to be used as auxiliary power sources for electric vehicles and the like in addition to being used as small power sources for backup storage such as personal computers. Furthermore, as for lithium ion capacitors that effectively utilize the advantages of lithium ion secondary batteries and electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01G11/06H01G11/38H01M4/62
CPCH01G11/06H01G11/38H01G11/46H01G11/50H01M4/36H01M4/622Y02E60/10H01M4/139Y02E60/13
Inventor 增田梓
Owner ZEON CORP