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Composition for forming undercoat layer of energy storage device

A technology of undercoating and composition, which is applied in the field of composition for undercoating, can solve problems such as capacity degradation, low battery resistance, and lack of clear understanding, and achieve the effect of suppressing the increase in resistance and reducing resistance

Pending Publication Date: 2020-11-06
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In this regard, it is not clear whether the use of a certain conductive carbon material can reduce the resistance of the battery and suppress the increase in resistance and the deterioration of capacity.

Method used

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  • Composition for forming undercoat layer of energy storage device
  • Composition for forming undercoat layer of energy storage device
  • Composition for forming undercoat layer of energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0254] EPOCROS WS-300 (manufactured by Nippon Shokubai Co., Ltd.), which is an aqueous solution containing an oxazoline polymer as a dispersant, has a solid content concentration of 10% by mass and a weight average molecular weight of 1.2×10 5 , oxazoline group amount 7.7mmol / g) 5.0g, pure water 37.15g and 2-propanol (manufactured by Junsei Chemical Co., Ltd., reagent special grade) 7.35g were mixed, and TC-2010 ( Toda Kogyo Co., Ltd. product, multilayer CNT) 0.5 g. The obtained mixture was subjected to ultrasonic treatment for 30 minutes using a probe-type ultrasonic irradiation device to prepare a dispersion liquid in which CNTs were uniformly dispersed. Mixed into it as containing polyammonium acrylate (PAA-NH 4 ) of an aqueous solution of ARON A-30 (Toagosei Co., Ltd., solid content concentration 31.6% by mass) 1.2 g, 41.35 g of pure water, and 7.44 g of 2-propanol (manufactured by Junsei Chemical Co., Ltd., reagent grade) were prepared. Primer liquid (1.38 mass % of sol...

Embodiment 1-2

[0256] A primer liquid was prepared in the same manner as in Example 1-1 except that the CNT was changed to VGCF-X (manufactured by Showa Denko Co., Ltd., multilayer CNT).

Embodiment 2-1

[0276] Using a wire bar coater (OSP13, wet film thickness 13 μm), the primer solution obtained in Example 1-1 was uniformly spread on an aluminum foil (thickness 15 μm) as a current collector, and dried at 150° C. for 30 minutes. An undercoat layer was formed to produce an undercoat foil.

[0277] Prepare 20 pieces of bottom-coated foils and cut them into 5×10cm products. After measuring the mass, measure the paper soaked in a 1:1 (mass ratio) mixture of 2-propanol and water to wipe off the bottom coating. The mass of the metal foil, the weight per unit area of ​​the primer layer calculated from the mass difference before and after wiping off is 150mg / m 2 .

[0278] 31.84 g of lithium iron phosphate (LFP, manufactured by Aleees Co., Ltd.) as an active material, and an NMP solution of polyvinylidene fluoride (PVdF) as a binder (12% by mass, Kureha, KF POLYMER L#1120) 13.05 g, 1.39 g of DENKA BLACK as a conductive material, and 13.72 g of N-methylpyrrolidone (NMP) were mixed f...

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Abstract

Provided is a composition for forming an undercoat layer of an energy storage device, the composition comprising carbon nanotubes, a carbon nanotube dispersant, and a solvent, the total content of metal impurities in the carbon nanotubes being less than 5 mass%, and the respective contents of cobalt and manganese in the carbon nanotubes both being less than 0.01 mass%. This composition makes it possible to provide an undercoat layer that exhibits the effects of reducing resistance and suppressing an increase in resistance.

Description

technical field [0001] The present invention relates to a composition for forming an undercoat layer of an energy storage device. Background technique [0002] In recent years, the development of high-performance batteries and secondary batteries that can be used repeatedly by charging have been actively carried out in response to the demand for smaller, lighter, and more functional portable electronic devices such as smart phones, digital cameras, and portable game consoles. The demand has greatly expanded. [0003] Among them, lithium-ion secondary batteries are currently the most intensively developed secondary batteries due to their high energy density, high voltage, and absence of memory effects during charging and discharging. [0004] In addition, in response to environmental problems in recent years, development of electric vehicles has been actively carried out, and higher performance has been demanded for secondary batteries serving as power sources. [0005] Lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01B1/24H01G11/28H01M4/02H01M4/13H01M4/66C09D5/00C09D5/24C09D7/20C09D7/61C09D7/65C09D201/00
CPCC09D5/24C09D7/20C09D7/61H01B1/24H01G11/28H01M4/13Y02E60/10H01G11/36H01G11/70H01G11/68H01G11/38H01G11/06H01G11/84C09D7/48C09D7/70C08K3/041C09D1/00C08K5/05H01M2004/028H01M4/0404H01M4/0435H01M4/139H01M4/136H01M4/1397H01M4/5825H01M4/661H01M4/663H01M4/668H01M4/667H01M10/052C01B32/174
Inventor 畑中辰也境田康志
Owner NISSAN CHEM IND LTD
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