Slurry

A slurry and peel strength technology, applied in the direction of sustainable manufacturing/processing, structural parts, final product manufacturing, etc., can solve the problems of long drying time and reduced production efficiency, and achieve the effect of maintaining thickness and inhibiting convection

Pending Publication Date: 2021-12-31
DAICEL CHEM IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] As a solution to the above-mentioned problems, pre-drying at a lower temperature (for example, 40°C to 60°C) can be considered, and then the drying temperature is gradually increased, but since drying takes a long time, there is a problem that the production efficiency decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0172] Preparation example 1 (preparation of cellulose nanofiber (CNF) slurry)

[0173] Commercially available hardwood pulp was suspended with water to obtain 100 L of a 1% by weight slurry liquid (1).

[0174] Next, using a disc refiner (manufactured by Hasegawa Iron Works Co., Ltd., trade name "SUPERFIBRATER 400-TFS"), the gap was set at 0.15 mm and the disc rotation speed was 1750 rpm, and the obtained slurry liquid was subjected to 10 times of beating treatment. Refining treatment.

[0175] Further, the 1% by weight slurry liquid after the refining treatment was homogenized 50 times at a treatment pressure of 50 MPa using a homogenizer (manufactured by Gaulin Corporation, trade name "15M8AT") equipped with a crushing type homogenizing valve seat.

[0176] The 1% by weight slurry liquid after the refining treatment and the homogenization treatment was repeatedly filtered through gauze to obtain a slurry liquid with a non-volatile matter concentration of 9.9% by weight.

...

Embodiment 1

[0180] (manufacturing of slurry)

[0181] 84 g of the CNF slurry liquid (1) obtained in Preparation Example 1 was put into a polypropylene container, and 1.5% by weight of CMC aqueous solution (CMC: carboxymethylcellulose sodium salt, decomposition temperature: 290° C. or higher, 1 wt. Viscosity of % aqueous solution at 25° C., 60 revolutions: 1500 to 3000 mPa s, manufactured by Daicel FineChem Co., Ltd., model 2200) 67.5 g, further adding 99.0 g of artificial graphite (average particle diameter: about 20 μm) as an active material, and using A homodisperser (manufactured by Tokukuki Kagaku Kogyo Co., Ltd., model L) was stirred at 3000 rpm for 30 minutes to obtain a slurry (1). The viscosity (complex viscosity measured at a frequency of 1 Hz using an MCR rheometer) at 25° C. of the obtained slurry (1) was 9.745 Pa·s.

[0182] (manufacturing of electrodes)

[0183] The obtained slurry (1) was applied to a square copper foil having a thickness of 15 μm and a side length of 150 ...

Embodiment 2

[0192] In the (manufacturing of electrode) process, it carried out similarly to Example 1 except having changed drying conditions from 60 degreeC*30 minutes to 80 degreeC*22.5 minutes.

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Abstract

The present invention provides a slurry which enables an active material to be firmly bonded to the surface of a collector even if heated and dried at high temperatures. A slurry according to the present invention contains at least an active material and a fibrous adhesiveness-imparting component, while having the characteristics expressed by formula (1). (1): (Peel strength P60) / (Peel strength P80) >= 0.8 (In the formula, peel strength P60 represents the peel strength as measured by: bonding an acrylic sheet to the surface of a solidified product of the slurry, which has a length of 25 mm, a width of 150 mm and a thickness of 100 (mu)m, and which is obtained by applying the slurry to the surface of a copper foil having a thickness of 15 (mu)m and subsequently drying the slurry at 60DEG C for 30 minutes, with use of a double-sided adhesive tape; obtaining a (copper foil) / (solidified product) / (acrylic sheet) laminate by means of 5 reciprocations of a weight of 1 kg; and peeling a copper foil end at a peeling angle of 90 degrees at a peeling rate of 100 mm / min, while keeping the acrylic sheet side of the thus-obtained laminate in a fixed state. Peel strength P80 represents the peel strength that is measured in the same manner as peel strength P60, except that the drying condition is changed to at 80DEG C for 22.5 minutes.).

Description

technical field [0001] The present invention relates to a slurry, an electrode including a laminate of an active material layer and a current collector formed using the slurry, and a battery including the electrode. Background technique [0002] In recent years, batteries such as lithium-ion secondary batteries have been considered to be installed in hybrid vehicles and electric vehicles in addition to information-related devices such as smartphones and notebook computers. Therefore, further miniaturization, higher capacity, and longer life are required. [0003] In the electrode, the following method is adopted: a slurry containing an active material, a binder, and a solvent is applied to a current collector and dried to form a coating film layer (=active material layer) containing an active material. This binds the active material to the surface of the current collector. Among these, styrene-butadiene rubber (SBR) etc. are known as said binder (patent document 1). In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/02H01G11/30H01G11/86H01M4/62
CPCH01M4/62H01G11/30H01G11/86H01G11/32H01G11/46Y02T10/70H01M2004/021H01M4/622H01M4/0404H01M4/661H01G11/38H01G11/50Y02E60/10H01M4/36H01M4/64H01M4/02H01M2004/027
Inventor 佐藤弘树土井邦朗
Owner DAICEL CHEM IND LTD
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