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Coating film composition for battery electrodes or separators, battery electrode or separator provided with coating film obtained by using same, and battery provided with battery electrode or separator

A battery electrode and composition technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, battery components, etc., can solve problems such as insufficient charge and discharge capacity, penetration of conductive foreign matter, and deterioration of the active material layer. Achieves excellent charge and discharge cycle characteristics, large charge and discharge capacity, and prevents deterioration

Active Publication Date: 2015-11-04
KYORITSU KAGAKU SANGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing batteries have low safety due to poor heat resistance and crush resistance, and there is a problem that conductive foreign matter mixed in the manufacturing stage penetrates the separator and causes a short circuit
In addition, the internal resistance of lithium-ion secondary batteries is high, the charging and discharging characteristics at high rates are not practically sufficient, the charging and discharging capacity is not sufficient, and the deterioration of the active material layer is also rapid when used for a long time
[0003] As mentioned above, as one of the reasons why lithium-ion secondary batteries cannot provide sufficient safety, the following reasons can be cited: the insulation of the separator due to the incorporation of conductive foreign matter, the generation of dendrites, the damage of the battery, etc. When it is destroyed, a short circuit occurs and heat is generated, the mechanism to prevent the destruction from thermal runaway and the heat resistance are not sufficient

Method used

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  • Coating film composition for battery electrodes or separators, battery electrode or separator provided with coating film obtained by using same, and battery provided with battery electrode or separator
  • Coating film composition for battery electrodes or separators, battery electrode or separator provided with coating film obtained by using same, and battery provided with battery electrode or separator
  • Coating film composition for battery electrodes or separators, battery electrode or separator provided with coating film obtained by using same, and battery provided with battery electrode or separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0236] In Example 1, a battery electrode coating film composition or a separator coating film composition composed of a solvent, a binder, and viscoelastic particles was applied to the negative electrode, and the solvent was evaporated, thereby obtaining a negative electrode with a coating film. A method of manufacturing a lithium ion secondary battery using this negative electrode will be described.

[0237] (Manufacture of composition)

[0238] (Production of viscoelastic particle slurry 1)

[0239] Add 10L of ion-exchanged water and urethane particles (manufactured by Negami Industry Co., Ltd.: low elastic modulus urethane 2μm particles in 60% water mixture: Art Pearl MM-120TW) 50kg into a 100L polypropylene tank, and stir For 12 hours, a 50% dispersion was produced. The dispersion was filtered with a nylon mesh with a mesh of 20 μm, and then magnetic foreign matter was removed with a 2T electromagnet, and water removed in the process was added to prepare a dispersion containing...

Embodiment 2

[0251] In Example 2, a battery electrode coating film composition or a separator coating film composition composed of a solvent, a binder, and viscoelastic particles was applied to the positive electrode, and the solvent was evaporated, thereby obtaining a positive electrode with a coating film. A method of manufacturing a lithium ion secondary battery using this positive electrode will be described.

[0252] (Manufacture of composition)

[0253] It is manufactured by the same method as Example 1.

[0254] (Manufacture of positive electrode)

[0255] Manufactured by the method of Example 1.

[0256] (Manufacture of negative electrode)

[0257] Manufactured by the method of Example 1.

[0258] (Production of positive electrode with coating)

[0259] The positive electrode was manufactured by the method of Example 1.

[0260] (Manufacturing of lithium ion secondary batteries)

[0261] Manufactured by the method of Example 1.

Embodiment 3

[0263] In Example 3, a battery electrode coating film composition or a separator coating film composition composed of a solvent, a binder, and viscoelastic particles was applied to the separator, and the solvent was evaporated, thereby obtaining a separator having a coating film A method of manufacturing a lithium ion secondary battery using this separator will be described.

[0264] (Manufacture of composition)

[0265] It is manufactured by the same method as Example 1.

[0266] (Manufacture of positive electrode)

[0267] Manufactured by the method of Example 1.

[0268] (Manufacture of negative electrode)

[0269] Manufactured by the method of Example 1.

[0270] (Manufacturing of separator with coating film)

[0271] The separator was manufactured by the same method as in Example 1.

[0272] (Manufacturing of lithium ion secondary batteries)

[0273] Manufactured by the method of Example 1.

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Abstract

The problem of the present invention is to provide a coating film composition for battery electrodes or separators that is capable of forming a coating film which has high heat resistance and for which the occurrence of curling is suppressed. The present invention is a coating film composition for battery electrodes or separators which includes a binding agent, a solvent, and viscoelastic particles.

Description

Technical field [0001] The present invention relates to a battery electrode coating film composition or a separator coating film composition, a battery electrode or separator having a coating film obtained using the coating film composition on the surface, and a battery having the battery electrode or separator. Background technique [0002] Lightweight, high-voltage, and large-capacity lithium-ion secondary batteries are used as mobile devices such as mobile phones and notebook computers; power supplies for power tools such as electric tools and vehicles have been partially put into practical use. However, conventional batteries have low safety due to poor heat resistance and crush resistance, and have a problem that conductive foreign matter mixed in during the manufacturing stage penetrates the separator and causes a short circuit. In addition, lithium ion secondary batteries have high internal resistance, the charging and discharging characteristics at high rates are practica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M2/16H01M4/02H01M4/13H01M50/417H01M50/449H01M50/489
CPCH01M2/1686H01M2/1653H01M4/13H01M4/366H01M4/62H01M10/052Y02E60/10H01M50/449H01M50/417H01M50/489
Inventor 清水嘉人上村太一
Owner KYORITSU KAGAKU SANGYO KK
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