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

A lithium secondary battery and binder technology, applied in battery electrodes, lithium storage batteries, batteries, etc., can solve the problems of inability to obtain charge-discharge cycle characteristics, reduced battery capacity retention rate, and low flexibility of electrode layers, achieving Excellent charge and discharge characteristics, excellent adhesion and electrolyte resistance, and high flexibility

Active Publication Date: 2014-10-22
DAI ICHI KOGYO SEIYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a binder with a high glass transition temperature of the polymer is used, the obtained electrode layer has low flexibility and cracks are likely to occur, so the capacity retention rate of the battery decreases and sufficient charge-discharge cycle characteristics cannot be obtained. question

Method used

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

Examples

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Embodiment

[0101] Next, examples and comparative examples of the present invention will be described. However, the present invention is not limited by these Examples. In addition, when "part" and "%" etc. appear below, unless otherwise specified, it is a mass basis.

[0102]

Synthetic example 1-1

[0104] Into a four-necked flask equipped with a stirrer, a reflux cooling tube, a thermometer, and a nitrogen blowing tube, Newpol BPE-20NK (manufactured by Sanyo Chemical Co., Ltd., an ethylene oxide adduct of bisphenol A, an average hydroxyl value of 360 mgKOH / g, and active hydrogen Radix 2) 100 parts by mass, trimethylolpropane (active hydrogen radical number 3) 9.5 mass parts, dimethylol propionic acid (active hydrogen radical number 2) 16.3 mass parts, dicyclohexylmethane diisocyanate 174.2 mass parts, methyl ethyl ketone 200 Parts by mass 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 4.2% with respect to the non-volatile matter. This solution was cooled to 45° C., and 12.3 parts by mass of triethylamine was added for neutralization, then 900 parts by mass of water was slowly added, and emulsified dispersion was performed using a homogenizer. Next, an aqueous amine solution ob...

Synthetic example 1-2

[0106] Change 100 parts by mass of Newpol BPE-20NK to Kuraray Polyol P-1020 (manufactured by Kuraray Co., Ltd., polyester polyol composed of 3-methyl-1,5-pentanediol and terephthalic acid, average hydroxyl value 110mgKOH / g, active hydrogen group 2) 145.2 parts by mass, dicyclohexylmethane diisocyanate added to 129.0 parts by mass, ethylenediamine (active hydrogen group 2) added to 6.2 parts by mass, and It produced similarly to the synthesis example 1-1, and obtained the polyurethane aqueous dispersion 1B of about 30% of non-volatile matter.

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Abstract

Provided are: a binder which exhibits high adhesion to a collector and is not separated during pressing, and has high flexibility, excellent binding properties and excellent electrolyte solution resistance; and a lithium secondary battery which uses an electrode that is produced using the binder, and has excellent charge / discharge characteristics. There is used a binder for electrodes, which contains (A) a polyisocyanate, (B) a compound having two or more active hydrogen groups, (C) a compound having one or more active hydrogen groups and one or more hydrophilic groups, and (D) an aqueous resin composition that contains, as an aqueous dispersion, a hydrophilic group-containing polyurethane that is formed of a chain extender, or an aqueous resin composition that is obtained by emulsifying an unsaturated polymerizable monomer polymer by means of the above-mentioned hydrophilic group-containing polyurethane.

Description

technical field [0001] The present invention relates to a binder for electrodes of a lithium secondary battery, and a lithium secondary battery using an electrode produced using the binder. Background technique [0002] Recently, portable electronic devices such as cellular phones, notebook computers, personal digital assistants (PDAs), video cameras, and digital cameras have been widely used. Research on this topic has been actively progressing due to increasing demands for reduction in weight, thickness, and capacity. Lithium secondary batteries have high voltage and good energy density, and are widely used as power sources for portable electronic devices. However, with the development of the miniaturized and lightweight display industry, further miniaturized and lightweight batteries are required, which require higher driving voltage, longer life, and Improved battery characteristics such as high energy density. In addition, recently, the development of medium-sized or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCC08G18/4213Y02T10/7011C08G18/3215H01M4/621C08G18/348C08G18/44C08G18/755C08G18/0823C08G18/0814C08G18/6659H01M4/622C08G18/758H01M10/052C08G18/12C08G18/4854C08G18/6692C08G18/73C08G18/3228C08G18/302C08F283/006Y02E60/10C08L75/00C08L75/04C08L75/14H01M4/62Y02T10/70H01M2220/30
Inventor 高桥克夫伊藤修一宫村岳志
Owner DAI ICHI KOGYO SEIYAKU CO LTD
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