Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, and electricity storage device

A technology for electrical storage devices and compositions, which is applied to non-aqueous electrolyte battery electrodes, battery electrodes, electrode current collector coatings, etc., can solve problems such as capacity reduction, active material peeling, and inability to maintain tightness, and achieve improved performance. Flexibility and adhesion, and the effect of improving battery performance

Pending Publication Date: 2021-12-14
株式会社引能仕材料
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, such an active material using a material with a large amount of intercalation of lithium is accompanied by a large volume change due to intercalation and deintercalation of lithium.
Therefore, if the conventionally used electrode binder is applied to such a material with a large lithium intercalation amount, the adhesiveness cannot be maintained, the active material will be peeled off, and the capacity will be significantly reduced due to charge and discharge.

Method used

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  • Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, and electricity storage device
  • Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, and electricity storage device
  • Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, and electricity storage device

Examples

Experimental program
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preparation example Construction

[0188] 2.2.4. Preparation method of slurry for storage device electrodes

[0189] The slurry for electrical storage device electrodes which concerns on this embodiment can be manufactured by any method as long as it contains the binder composition for electrical storage devices mentioned above, and an active material. From the viewpoint of more efficiently and inexpensively producing a slurry with better dispersibility and stability, it is preferable to add an active material and any optional additive components used as necessary to the binder composition for electrical storage devices. These are mixed and manufactured. As a specific production method, the method described in Japanese Patent No. 5999399 etc. is mentioned, for example.

[0190] 3. Electrode of electrical storage equipment

[0191] The electrical storage device electrode according to the present embodiment includes a current collector and an active material layer formed by applying and drying the above-mention...

Embodiment 2～22

[0251] 5.2. Examples 2-22, Comparative Examples 1-10

[0252] In the above "5.1.1. Preparation and evaluation of binder composition for electrical storage equipment (1) Preparation of binder composition for electrical storage equipment", the types and amounts of each monomer are listed in Table 1 or the following table respectively As described in 2, except that, the binder composition for electrical storage devices containing 20 mass % of polymer particles was obtained similarly.

[0253] And, using the binder composition for an electrical storage device prepared above, except that, the slurry for an electrical storage device electrode was prepared in the same manner as in the above-mentioned Example 1, and an electrical storage device electrode and an electrical storage device were respectively prepared. Evaluation was performed in the same manner as in Example 1 above.

Embodiment 23

[0255] In Example 20, as the thickener, 0.9 parts by mass of CMC (trade name "CMC2200", manufactured by Daicel Co., Ltd.) and CNF (trade name "CELISH KY-100G" manufactured by Daicel Co., Ltd., fiber diameter 0.07 μm) 0.1 parts by mass, the slurry for electrical storage device electrodes was prepared in the same manner as in Example 20, and an electrical storage device electrode and an electrical storage device were produced, respectively, and evaluated in the same manner as in Example 1 above. The results are shown in Table 3 below.

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Abstract

The present invention provides a binder composition for electricity storage devices, which enables the production of an electricity storage device electrode that has good charge / discharge durability characteristics, while exhibiting excellent flexibility and adhesion. A binder composition for electricity storage devices according to the present invention contains a polymer (A) and a liquid medium (B); and the polymer (A) contains 30-65 parts by mass of a repeating unit (a1) derived from a conjugated diene compound, 5-40 parts by mass of a repeating unit (a2) derived from an unsaturated carboxylic acid and 10-40 parts by mass of a repeating unit (a3) derived from an alpha, beta-unsaturated nitrile compound, while satisfying the condition 1 described below. [Condition1] 1.0 g of a film that is obtained by drying the polymer (A) in a constant-temperature bath at 40 degC is immersed in 20 mL of an aqueous sodium hydroxide solution having a pH of 9, and is subsequently shaken for one hour by means of an ultrasonic bath. If Ma is the weight of the film before immersion and Mb is the weight of the film that is dried after immersion, the value of (Mb / Ma) * 100 is 90% or more.

Description

technical field [0001] The present invention relates to a binder composition for an electrical storage device, a slurry for an electrode of an electrical storage device, an electrode for an electrical storage device, and an electrical storage device. Background technique [0002] In recent years, power storage devices having high voltage and high energy density have been required as power sources for driving electronic devices. Lithium-ion batteries, lithium-ion capacitors, and the like are expected as such power storage devices. [0003] An electrode used in such an electrical storage device is prepared by applying a composition (slurry for an electrical storage device electrode) containing an active material and a polymer functioning as a binder to the surface of a current collector and drying it. manufacture. The properties required for polymers used as binders include the binding ability between active materials and the adhesion between active materials and current col...

Claims

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Application Information

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IPC IPC(8): H01M4/62C08F236/04H01G11/30H01M4/13H01M4/136H01M4/139H01M4/1397
CPCC08F236/04H01M4/62Y02E60/10H01M4/386H01M4/622H01M4/0404H01M4/1395H01G11/38H01G11/06H01G11/50H01G11/86H01G11/42H01G11/66H01G11/04H01M4/139H01M4/1391H01M4/13H01M4/131H01M4/134H01G11/30
Inventor 中山卓哉大塚巧治大桥泰良增田香奈
Owner 株式会社引能仕材料
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