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Binder for electrodes of lithium secondary batteries, electrode produced using said binder, and lithium secondary battery using said electrode

A lithium secondary battery and binder technology, which is applied to battery electrodes, non-aqueous electrolyte storage battery electrodes, lithium storage batteries, etc., can solve problems such as electrode layer peeling, battery performance reliability reduction, and press processing machine pollution, and achieve suppression High internal resistance, high adhesion, and excellent charge-discharge characteristics

Inactive Publication Date: 2017-10-13
DAI ICHI KOGYO SEIYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the electrode layer with a low content of the binder component, the electrode layer is easily peeled off from the current collector when press working is performed.
Therefore, the following problems have been pointed out: not only the contamination of the press processing machine due to the electrode material, but also the electrode is assembled into the battery in a state where a part of the electrode layer is peeled off, and the reliability of the battery performance is lowered.

Method used

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  • Binder for electrodes of lithium secondary batteries, electrode produced using said binder, and lithium secondary battery using said electrode
  • Binder for electrodes of lithium secondary batteries, electrode produced using said binder, and lithium secondary battery using said electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (Embodiment 1) Synthesis of Polyurethane Aqueous Dispersion A

[0082] Add 60.0 parts by mass of Kuraray Polyol (Kuraray Polyol) P-1010 (manufactured by Kuraray Co., Ltd., with an average hydroxyl value of 112 mgKOH) to a four-necked flask equipped with a stirrer, a reflux cooling tube, a thermometer and a nitrogen blowing tube / g, the number of active hydrogen groups is 2), 3.0 parts by mass of trimethylolpropane (number of active hydrogen groups is 3), 66.6 parts by mass of dimethylol propionic acid (number of active hydrogen groups is 2), 170.4 parts by mass of iso Phorone diisocyanate, 200 parts by mass of methyl ethyl ketone, reacted at 75° C. for 4 hours to obtain methyl ethyl ketone of a urethane prepolymer with a free isocyanate group content of 5.1% relative to the non-volatile components. Ketone solution. The solution was cooled to 45°C, and 47.8 parts by mass of triethylamine was added for neutralization, then 1500 parts by mass of water was gradually added,...

Embodiment 2

[0083] (Embodiment 2) Synthesis of Polyurethane Aqueous Dispersion B

[0084] Add 60.0 mass parts of Eternacoll (ETERNACOLL) UH-100 (manufactured by Ube Industrial Co., Ltd., with an average hydroxyl value of 112 mgKOH / g) in a four-necked flask equipped with a stirrer, a reflux cooling pipe, a thermometer and a nitrogen blowing pipe The number of active hydrogen groups is 2), 3.0 parts by mass of trimethylolpropane (number of active hydrogen groups is 3), 66.6 parts by mass of dimethylolpropionic acid (number of active hydrogen groups is 2), 170.4 parts by mass of isophorone Diisocyanate and 200 parts by mass of methyl ethyl ketone were reacted at 75°C for 4 hours to obtain a methyl ethyl ketone solution of a urethane prepolymer having a free isocyanate group content of 5.1% relative to the non-volatile components . The solution was cooled to 45°C, and 47.8 parts by mass of triethylamine was added for neutralization, then 1500 parts by mass of water was gradually added, and e...

Embodiment 3

[0085] (Embodiment 3) Synthesis of Polyurethane Aqueous Dispersion C

[0086] Add 60.0 mass parts of polytetrahydrofuran (PolyTHF) 1000 (manufactured by Japan BASF (BASF Japan) Co., Ltd. in a four-necked flask equipped with a stirrer, a reflux cooling pipe, a thermometer and a nitrogen blowing pipe, the average hydroxyl value is 112mgKOH / g, the activity The number of hydrogen groups is 2), 3.0 parts by mass of trimethylolpropane (number of active hydrogen groups is 3), 66.6 parts by mass of dimethylol propionic acid (number of active hydrogen groups is 2), 170.4 parts by mass of isophorone di Isocyanate and 200 parts by mass of methyl ethyl ketone were reacted at 75° C. for 4 hours to obtain a methyl ethyl ketone solution of a urethane prepolymer having a free isocyanate group content of 5.1% relative to the nonvolatile matter. The solution was cooled to 45°C, and 47.8 parts by mass of triethylamine was added for neutralization, then 1500 parts by mass of water was gradually a...

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PUM

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Abstract

To provide a binder which exhibits good adhesion to a collector, while having excellent binding properties and electrolyte solution resistance, and which is capable of suppressing the internal resistance of a battery without being reduced in the content of the binder component; and to provide a lithium secondary battery which uses an electrode that is produced using this binder, and which has excellent charge / discharge characteristics. The present invention relates to a binder for electrodes of lithium secondary batteries, which contains at least (A) a polyisocyanate, (B) a compound having one or more active hydrogen groups and a hydrophilic group and (C) an aqueous dispersion of a polyurethane resin (X) obtained using a chain extender, and wherein the acid value or the amine value of the component (X) is 40-200 mgKOH / g.

Description

technical field [0001] The invention relates to a binder for electrodes of a lithium secondary battery, an electrode manufactured using the binder, and a lithium secondary battery using the electrode. Background technique [0002] Lithium secondary batteries have high voltage and good energy density, and thus are widely used as power sources for portable electronic devices. In addition, in response to demands such as miniaturization, research is being conducted on performance improvement. The characteristics of a battery are greatly influenced by the electrodes, electrolytes, and other battery materials used. Especially for electrodes, the characteristics are determined by the electrode active material, current collector, and binder that imparts adhesion between them. . For example, the amount and type of active material used determine the amount of lithium ions that can be combined with the active material. Therefore, the greater the amount of active material and the more...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/62Y02E60/10H01M4/13H01M4/622H01M10/052
Inventor 高桥克夫金子文弥宫村岳志伊藤修一
Owner DAI ICHI KOGYO SEIYAKU CO LTD