Battery electrode coating film composition or separator coating film composition, battery electrode or separator having a coating film obtained using the coating film composition, and battery having the battery electrode or separator

A battery electrode and composition technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, battery pack components, etc., can solve the problems of insufficient charging and discharging capacity, penetration of conductive foreign matter, deterioration of active material layers, etc. Achieve excellent charge and discharge cycle characteristics, large charge and discharge capacity, and curb suppression effects

Active Publication Date: 2017-10-27
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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  • Battery electrode coating film composition or separator coating film composition, battery electrode or separator having a coating film obtained using the coating film composition, and battery having the battery electrode or separator
  • Battery electrode coating film composition or separator coating film composition, battery electrode or separator having a coating film obtained using the coating film composition, and battery having the battery electrode or separator
  • Battery electrode coating film composition or separator coating film composition, battery electrode or separator having a coating film obtained using the coating film composition, and battery having the battery electrode or separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0237] (manufacture of composition)

[0238] (Preparation of viscoelastic particle slurry 1)

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

Embodiment 2

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

[0252] (manufacture of composition)

[0253] It was produced by the same method as in Example 1.

[0254] (production 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] (Manufacture of positive electrode with coating film)

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

[0260] (manufacture of lithium-ion secondary batteries)

[0261] Manufactured by the method of Example 1.

Embodiment 3

[0263] In Example 3, the battery electrode coating film composition or separator coating film composition composed of solvent, binder and viscoelastic particles is coated on the separator, and the solvent is evaporated, thereby obtaining a separator with a coating film , a method of manufacturing a lithium ion secondary battery using the separator will be described.

[0264] (manufacture of composition)

[0265] It was produced by the same method as in Example 1.

[0266] (production 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] (Manufacture of separator with coating film)

[0271] A separator was produced by the same method as in Example 1.

[0272] (manufacture of lithium-ion secondary batteries)

[0273] Manufactured by the method of Example 1.

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Abstract

An object of the present invention is to provide a battery electrode coating film composition or a separator coating film composition capable of forming a coating film capable of suppressing curling and having high heat resistance. The invention is a battery electrode coating film composition or a separator coating film composition, which comprises a binder, 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 by using the coating film composition on the surface, and a battery having the battery electrode or separator. Background technique [0002] Lithium-ion secondary batteries with light weight, high voltage, and large capacity have been partially put into practical use as power supplies for mobile devices such as mobile phones and notebook computers, and power tools such as electric tools and cars. However, conventional batteries have low safety due to poor heat resistance and crush resistance, and have problems in that conductive foreign matter mixed in during the manufacturing process penetrates the separator and causes a short circuit. In addition, lithium-ion secondary batteries have high internal resistance, insufficient charge and discharge characteristics at high rate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M2/16H01M4/02H01M4/13H01M50/417H01M50/449H01M50/489
CPCH01M4/13H01M4/366H01M4/62H01M10/052Y02E60/10H01M50/449H01M50/417H01M50/489
Inventor 清水嘉人上村太一
Owner KYORITSU KAGAKU SANGYO KK
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