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Binder composition for lithium ion secondary battery electrode, lithium ion secondary battery electrode, and lithium ion secondary battery

A secondary battery, lithium ion technology, used in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problem of insufficient flexibility, flexibility, difficulty in making lithium secondary batteries, low peel strength, etc. problems, to achieve the effect of improving mechanical strength and flexibility, reducing internal resistance, and improving flexibility

Active Publication Date: 2019-04-02
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, there are problems in that crystalline polymers such as polyvinyl alcohol are relatively hard, and when used alone, the softness and flexibility are insufficient, and cracks and activity of the mixture layer occur during roll forming or roll-to-roll forming. The peeling and falling off of the substance makes it difficult to make a lithium secondary battery that can operate normally
In addition, in the adhesive composition containing polymer particles in which the acrylonitrile unit and the unsaturated carboxylic acid unit are out of the above range, the peel strength tends to be low, and the rate characteristic is low (Table 1, Table 1 of Patent Document 2, Comparative example of Table 3)

Method used

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  • Binder composition for lithium ion secondary battery electrode, lithium ion secondary battery electrode, and lithium ion secondary battery
  • Binder composition for lithium ion secondary battery electrode, lithium ion secondary battery electrode, and lithium ion secondary battery
  • Binder composition for lithium ion secondary battery electrode, lithium ion secondary battery electrode, and lithium ion secondary battery

Examples

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Effect test

preparation example Construction

[0168] [Preparation of slurry for electrodes: Production of electrodes]

[0169] The slurry for lithium ion secondary battery electrodes can be prepared by mixing the binder composition for electrodes of this invention mentioned above, and an active material.

[0170] As the above-mentioned active material, known general active materials used in lithium ion secondary battery electrodes can be used.

[0171] As the positive electrode active material, for example, olivine-type lithium iron phosphate, lithium cobaltate, lithium manganate, lithium nickelate, ternary nickel-cobalt lithium manganate, lithium-nickel-cobalt-aluminum composite oxide, etc. can be used.

[0172] As the active material for the negative electrode, a carbon material is preferable. Examples of the carbon material include graphite-based carbon materials (graphite) such as natural graphite, artificial graphite, and expanded graphite, carbon black, activated carbon, carbon fiber, coke, soft carbon, and hard ca...

Embodiment 1～4、 comparative example 1～2

[0208] 〔Measurement evaluation method〕

[0209] First, the measurement and evaluation methods used in Examples 1 to 4 and Comparative Examples 1 to 2 will be described.

[0210]

[0211] The average particle diameter was measured as follows using a dynamic light scattering particle size distribution analyzer (manufactured by PARTICLE SIZING SYSTEMS; device name "NICOMP 380ZLS").

[0212] The prepared emulsion was diluted to 10,000 times with purified water, and then irradiated with ultrasonic waves for 15 minutes. After 1 minute of the above-mentioned ultrasonic irradiation treatment, measurement was performed with a measurement time of 3 minutes and an accumulation frequency of 5 times. The obtained measured value (particle size distribution) is processed using the NICOMP processing method of NICOMP Corporation (the method of calculating and processing the particle size in terms of polydisperse particles), and the average particle size of the volume distribution is calcula...

Embodiment 1

[0229] [Preparation of Binder Composition for Electrode]

[0230] Into a detachable flask equipped with a reflux condenser, a stirrer, a dropping funnel, and a thermometer, 813 parts of water as a dispersion medium, and 1,2-bis side chains containing the structure shown in the above structural formula (1a) as a dispersant 384 parts of PVA-based resin with alcohol structural unit (saponification degree: 99.06%, viscosity average polymerization degree: 310, content rate of 1,2-diol structural unit represented by the above structural formula (1a): 6%), 0.63 part of sodium acetate , while stirring, the temperature in the flask was raised to 75° C., and stirred for 30 minutes.

[0231] 13.5 parts of butyl acrylate (BA) and 16.5 parts of styrene (St) as monomers for emulsion polymerization in the first step, and 6 parts of aqueous sodium bisulfite (5% by weight) as a polymerization initiator were added to the warm bath. and 5.4 parts of ammonium persulfate aqueous solution (5% by w...

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Abstract

The binder composition for lithium ion secondary battery electrodes of this invention contains the emulsion in which the polymer particle originating in an ethylenic unsaturated monomer was dispersed in the polyvinyl alcohol-type resin aqueous solution. The average particle diameter of the aforementioned polymer particles is not less than 50 nm and less than 600 nm. Or the viscosity average polymerization degree of the said polyvinyl-alcohol-type resin is 400-3000. A lithium ion secondary battery having a lithium ion secondary battery electrode obtained using the binder composition of the present invention can stably obtain a high charge and discharge capacity.

Description

technical field [0001] The invention relates to a binder composition for a lithium ion secondary battery electrode, a lithium ion secondary battery electrode and a lithium ion secondary battery. Specifically, it relates to a binder composition used together with an active material in order to constitute an electrode of a lithium ion secondary battery, a lithium ion secondary battery electrode obtained by using the binder composition, and a lithium ion secondary battery having the same electrodes of lithium-ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries can be used as power sources for electronic devices such as mobile phones and notebook computers due to their light weight, high energy density, and high durability against repeated charge and discharge. In addition, electric vehicles such as electric vehicles are also used as power supply devices capable of discharging and charging. In particular, with the increase in size of batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/622H01M10/0525Y02E60/10H01M4/13Y02T10/70
Inventor 渋谷光夫矢野友健驹场慎一薮内直明竹本大起
Owner MITSUBISHI CHEM CORP