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Binder for electrodes of lithium ion batteries, paste for negative electrodes of lithium ion batteries, and method for producing negative electrode of lithium ion battery

Active Publication Date: 2013-08-07
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, when polyimide resin is used as a binder, there is a problem that the initial efficiency becomes low.

Method used

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  • Binder for electrodes of lithium ion batteries, paste for negative electrodes of lithium ion batteries, and method for producing negative electrode of lithium ion battery
  • Binder for electrodes of lithium ion batteries, paste for negative electrodes of lithium ion batteries, and method for producing negative electrode of lithium ion battery
  • Binder for electrodes of lithium ion batteries, paste for negative electrodes of lithium ion batteries, and method for producing negative electrode of lithium ion battery

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preparation example Construction

[0022] The tetracarboxylic dianhydride used for preparation of the polyimide precursor used by this invention is selected from the tetracarboxylic dianhydride represented by general formula (1) and (2). As such an example, pyromellitic anhydride, biphenyltetracarboxylic dianhydride, etc. are mentioned. Among them, tetracarboxylic dianhydride represented by general formula (2) is particularly preferable. As a specific example, biphenyl tetracarboxylic dianhydride etc. are mentioned.

[0023] As other tetracarboxylic dianhydrides, benzophenone tetracarboxylic dianhydride, diphenyl ether tetracarboxylic dianhydride, diphenylsulfone tetracarboxylic dianhydride, hexafluoropropylenebis(phthalic anhydride) Wait. Moreover, aliphatic tetracarboxylic dianhydrides, such as cyclobutane tetracarboxylic dianhydride, butane tetracarboxylic dianhydride, cyclopentane tetracarboxylic dianhydride, cyclohexane tetracarboxylic dianhydride, and naphthalene tetracarboxylic dianhydride, can also be...

Embodiment 1

[0075] In a fully dried four-neck separable flask, 19.22 g (96.0 mmol) of DAE and 0.99 g (4.0 mmol) of APDS were dissolved in 150 g of NMP under a nitrogen atmosphere. 10.03 g (46.0 mmol) of PMDA, 14.82 g (46.0 mmol) of BTDA, and 30.2 g of NMP were added thereto, and it stirred while cooling so that it might become 50 degreeC or more. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic-acid A solution (20 weight% of solid content concentration).

[0076] 10.8 g of the negative electrode active material produced above was mixed with 6 g of the polyamic acid A solution. The mixture was passed through a three-roll mill 3 times to obtain a negative electrode paste. Using a spatula, the negative electrode paste was applied onto an electrolytic copper foil (manufactured by Nippon Mining Metal Co., Ltd., HLPB) to a thickness of 25 μm. In an inert oven (KOYO THERMO SYSTEMS, INH-9), the electrodeposited copper foil coated with the negative electrode paste was heated...

Embodiment 2

[0079] In a fully dried four-neck separable flask, 19.22 g (96.0 mmol) of DAE and 0.99 g (4.0 mmol) of APDS were dissolved in 150 g of NMP under a nitrogen atmosphere. 10.25 g (47.0 mmol) of PMDA, 15.30 g (47.5 mmol) of BTDA, and 34.0 g of NMP were added thereto, and it stirred while cooling so that it might become 50 degreeC or more. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic-acid B solution (20 weight% of solid content concentration).

[0080] A negative electrode was produced in the same manner as in Example 1. The initial efficiency was measured by the above-mentioned method, and it was 73%. The efficiency after 5 cycles was 65%.

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Abstract

The present invention is directed to a binder for a lithium ion battery electrode, comprising a polyimide precursor having a tetracarboxylic acid residue and a diamine residue and / or a polyimide, the polyimide precursor having a residue of a tetracarboxylic dianhydride selected from those represented by the following general formulas (1) and (2) as the tetracarboxylic acid residue, and a residue of a diamine selected from those represented by the following general formulas (3) and (4) as the diamine residue, the content of the acid residue being from 0.90 to 0.95 moles based on 1 mole of the diamine residue.

Description

technical field [0001] The invention relates to a binder for lithium ion battery electrodes, a paste for lithium ion battery negative poles using the same, and a preparation method for lithium ion battery negative poles. Background technique [0002] As a rechargeable high-capacity battery, lithium-ion batteries can be used to improve the functionality of electronic equipment and enable them to work for a long time. Furthermore, they are installed in automobiles and the like, and are attracting attention as batteries for hybrid vehicles and electric vehicles. Lithium-ion batteries currently widely used have a positive electrode and a negative electrode formed by coating an aluminum foil with a paste containing an active material such as lithium cobalt oxide and a binder such as polyvinylidene fluoride (PVDF), The negative electrode is formed by coating a paste containing a carbon-based active material and a binder such as PVDF or styrene-butadiene-rubber (SBR) on a copper f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M4/38
CPCH01M4/387Y02E60/122Y02T10/7011H01M10/0525H01M4/1395H01M4/386H01M4/134H01M4/622Y02E60/10H01M4/139H01M4/38H01M4/62Y02T10/70
Inventor 富川真佐夫弓场智之茶山奈津子
Owner TORAY IND INC
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