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Mixture for non-aqueous electrolyte secondary battery, electrode for same, and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, circuits, etc., can solve the problem of insufficient electrode peel strength, and achieve excellent peel strength, suppression of uneven existence, and good productivity. Effect

Inactive Publication Date: 2015-07-01
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this example, a cross-linked polyacrylic acid having a very large molecular weight was used as the polyacrylic acid, and the peel strength of the obtained electrode was insufficient.

Method used

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  • Mixture for non-aqueous electrolyte secondary battery, electrode for same, and non-aqueous electrolyte secondary battery
  • Mixture for non-aqueous electrolyte secondary battery, electrode for same, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0113] [Manufacture Example 1] (Manufacture of carboxyl group-containing vinylidene fluoride polymer (1))

[0114] 1040g of ion-exchanged water, 0.8g of methyl cellulose, 3.0g of diisopropyl peroxydicarbonate, 396g of vinylidene fluoride and 4.0g of monomethyl maleate were charged into an autoclave with an inner capacity of 2 liters. The suspension polymerization was carried out at 45°C for 45 hours. The highest pressure during this period reached 4.1MPa. After the polymerization is completed, the polymer slurry is dehydrated and washed with water. Thereafter, drying was performed at 80° C. for 20 hours to obtain a powdery carboxyl group-containing vinylidene fluoride polymer (1) (polymer (1)). The weight-average molecular weight of polymer (1) is 500,000, and inherent viscosity is 1.7dl / g, I R (=I 1650-1800 / I 3000-3100 )(It should be noted that at 1750cm -1 The absorbance from the carbonyl group was observed at 3025 cm -1 The absorbance from the CH structure was obser...

manufacture example 2

[0115] [Manufacture example 2] (manufacture of polyvinylidene fluoride)

[0116] 1075g of ion-exchanged water, 0.4g of methyl cellulose, 2.5g of di-n-propyl peroxydicarbonate, 5g of ethyl acetate, and 420g of vinylidene fluoride were charged into an autoclave with an inner capacity of 2 liters, and carried out at 25°C for 14 hours of suspension polymerization. The highest pressure during this period reached 4.0MPa. After the polymerization is completed, the polymer slurry is dehydrated and washed with water. Thereafter, drying was performed at 80° C. for 20 hours to obtain powdery polyvinylidene fluoride (PVDF). The weight average molecular weight of PVDF is 500,000, and the logarithmic viscosity is 1.7dl / g.

[0117] [Measurement of weight-average molecular weight of carboxyl group-containing vinylidene fluoride polymer (1) and polyvinylidene fluoride]

[0118] The polystyrene-equivalent weight average molecular weights of the carboxyl group-containing vinylidene fluoride ...

Embodiment 1

[0132] (Preparation of mixture for non-aqueous electrolyte secondary battery)

[0133] Polyacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd., carboxyl group content: 1.4 × 10 -2 mol / g) 0.1 g was dissolved in 90 g of N-methyl-2-pyrrolidone to obtain a 10% by weight binder solution (1). 8 g of the obtained binder solution (1), artificial graphite (manufactured by Hitachi Chemical Industry, MAG, average particle diameter 20 μm, specific surface area 4.2 m 2 / g) 9.2 g and 5.8 g of N-methyl-2-pyrrolidone for adjusting the viscosity of the mixture were stirred and mixed to obtain a mixture (1) for a nonaqueous electrolyte secondary battery. The viscosity of the mixture (1) for nonaqueous electrolyte secondary batteries was 12000 mPa·s.

[0134] (production of electrodes)

[0135] The obtained mixture (1) for a non-aqueous electrolyte secondary battery was coated on a copper foil having a thickness of 10 μm as a current collector using a separator and a bar coater ...

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Abstract

An object of the present invention is to provide a mixture layer and mixture for a non-aqueous electrolyte secondary battery with excellent peeling strength from a power collector, that is highly productive in manufacturing a non-aqueous secondary battery electrode and a non-aqueous secondary battery, and suppresses mal-distribution of a binding agent in the mixture layer when manufacturing the electrode. The non-aqueous secondary battery mixture contains at least one type of unsaturated carboxylic acid polymer (A) selected from a polyacrylic acid and polymethacrylic acid, vinylidene fluoride polymer containing carboxyl (B), an electrode active material, and a weight-average molecular weight of 1,000 - 150,000 of polyethylene oxide conversion measured by GPC of the unsaturated carboxylic acid polymer (A).

Description

technical field [0001] The present invention relates to a mixture for a nonaqueous electrolyte secondary battery, an electrode for a nonaqueous electrolyte secondary battery, and a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, the development of electronic technology has been remarkable, and various machines have gradually become smaller and lighter. In line with the miniaturization and weight reduction of the above-mentioned electric appliances, the size and weight reduction of batteries serving as their power sources are required. As a battery that can obtain a large amount of energy with a small volume and weight, non-aqueous electrolyte secondary batteries using lithium are mainly used as power sources for small electrical appliances used in households such as mobile phones, personal notebook computers, and video cameras. [0003] In electrodes of nonaqueous electrolyte secondary batteries, polyvinylidene fluoride (PVDF) is mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139
CPCY02E60/122H01M4/622H01M4/621H01M4/13H01M2004/021H01M4/623Y02E60/10H01M4/139H01M4/62
Inventor 萩原京平
Owner KUREHA KAGAKU KOGYO KK
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