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Thermal crosslinking type slurry for lithium ion battery, electrode, separator, separator/electrode laminate, and lithium ion battery

A lithium-ion battery, thermal cross-linking technology, applied in the direction of battery electrodes, electrode collector coatings, separators/films/diaphragms/spacers, etc. Changing the cycle characteristics of lithium-ion batteries is easy to reduce, etc., to achieve the effect of improving output characteristics and improving resilience

Active Publication Date: 2018-10-16
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, depending on the electrode active material, it tends to expand and contract with charge and discharge
Therefore, the electrode for lithium ion battery has the following problem: due to the volume change (resilience) in the initial stage of repeated charging and discharging, the electrical characteristics such as cycle characteristics of the lithium ion battery using the electrode for lithium ion battery are likely to decrease.
However, the obtained heat-resistant separator has the following technical problem: due to deformation during transportation on the production line and bending in the battery cell, the bond between the coating layer and the polyolefin microporous membrane cannot be maintained, and it is easy to fall off.

Method used

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  • Thermal crosslinking type slurry for lithium ion battery, electrode, separator, separator/electrode laminate, and lithium ion battery
  • Thermal crosslinking type slurry for lithium ion battery, electrode, separator, separator/electrode laminate, and lithium ion battery
  • Thermal crosslinking type slurry for lithium ion battery, electrode, separator, separator/electrode laminate, and lithium ion battery

Examples

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Embodiment

[0248] Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. The present invention is not limited by the following examples. In addition, unless otherwise specified, "parts" and "%" hereinafter represent parts by mass and % by mass, respectively.

[0249] 1. Manufacture of component (A)

manufacture example 1

[0251] In a reaction apparatus equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen gas introduction tube, 1095 g of ion-exchanged water, 400 g (2.81 mol) of a 50% aqueous solution of acrylamide, and sodium methallylsulfonate were added. 0.22 g (0.0014 mol), after removing the oxygen in the reaction system by nitrogen, the temperature was raised to 50°C. Here, 2.0 g of 2,2′-azobis(2-amidinopropane) dihydrochloride (manufactured by Nippon Chemical Co., Ltd., trade name “NC-32”) and 50 g of ion-exchanged water were put in, and the temperature was raised to 80 The reaction was carried out at °C for 3 hours to obtain an aqueous solution containing polyacrylamide.

manufacture example 2

[0253] In a reaction apparatus equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen introduction tube, 1428 g of ion-exchanged water, 400 g (2.81 mol) of 50% aqueous acrylamide solution, 63.5 g (0.70 mol) of 80% aqueous acrylic acid solution, and methallyl were added. Sodium sulfonate 0.56g (0.0035mol). After the oxygen in the reaction system was removed by passing nitrogen, the temperature was raised to 50°C. Here, 2.5 g of 2,2′-azobis(2-amidinopropane) dihydrochloride (manufactured by Nippon Chemical Co., Ltd., trade name “NC-32”) and 50 g of ion-exchanged water were put in, and the temperature was raised to 80 The reaction was performed at °C for 3.0 hours to obtain an aqueous solution containing a polyacrylamide-acrylic acid copolymer.

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Abstract

The present application provides a thermal crosslinking type slurry for a lithium ion battery, a method for producing the same, an electrode for a lithium ion battery, a separator for a lithium ion battery, a separator / an electrode laminate for a lithium ion battery, and a lithium ion battery. The present application provides the thermal crosslinking type slurry for the lithium ion battery, comprising: a water-soluble poly(meth)acrylamide (A), which is 100% by mole based on the structural unit, wherein the water-soluble poly(meth)acrylamide (A) contains 50% by mole or more of a structural unit derived from the compound (a) having an N-unsubstituted or monosubstituted (meth)acrylamide group; a water-soluble crosslinking agent (A1), wherein the water-soluble crosslinking agent (A1) containsone or more selected from the group consisting of formaldehyde, glyoxal, hexamethylenetetramine, urea-formaldehyde resin, and methylol melamine resin; and water.

Description

technical field [0001] The present application relates to a slurry for thermally crosslinked lithium ion batteries, a method for producing the same, an electrode for lithium ion batteries, a separator for lithium ion batteries, a separator / electrode laminate for lithium ion batteries, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are small, lightweight, have high energy density, and can be repeatedly charged and discharged, and are used in a wide range of applications. Therefore, in recent years, improvement of battery components such as electrodes and separators has been studied for the purpose of further improving the performance of lithium ion batteries. [0003] Both positive and negative electrodes of lithium ion batteries are manufactured by the following method: a slurry formed by dispersing an electrode active material and a binder resin in a solvent is coated on both sides on a collector (such as a metal foil), and the solvent is dri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/40H01M50/403H01M50/409Y02P70/50H01M4/622H01M4/134H01M4/131H01M4/0404H01M4/0471H01M4/62H01M4/386H01M4/48H01M4/1391H01M4/1395H01M4/04Y02E60/10
Inventor 尾崎真仁笹川巨树池谷克彦合田秀树瀧下雅之
Owner ARAKAWA CHEM IND LTD
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