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Negative electrode containing microcapsules, and lithium-ion secondary battery equipped with same

A secondary battery, lithium ion technology, applied in secondary batteries, negative electrodes, battery electrodes, etc., to achieve the effect of suppressing short-circuit current

Active Publication Date: 2020-10-09
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This lithium-ion secondary battery has the advantage of high energy density, but on the other hand, since lithium metal and lithium ions are used, sufficient measures for safety are required

Method used

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  • Negative electrode containing microcapsules, and lithium-ion secondary battery equipped with same
  • Negative electrode containing microcapsules, and lithium-ion secondary battery equipped with same
  • Negative electrode containing microcapsules, and lithium-ion secondary battery equipped with same

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Experimental program
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Effect test

Embodiment 1

[0090] -Negative electrode production-

[0091] 1. Slurry Preparation

[0092] A 5 L planetary disperser was used for slurry preparation.

[0093] With natural graphite 960g, Super-P (conductive carbon, BET specific surface area is 62m 2 / g) 10g, microcapsules (FS-100SD manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd., expansion start temperature is 125 to 135°C, maximum expansion temperature is 150 to 160°C) 5g were mixed for 5 minutes, then, 1% CMC (using pure CMC was dissolved in water) 450 g, and further mixed for 30 minutes. Next, 300 g of a 1%-CMC aqueous solution was added and kneaded for 30 minutes, and then 250 g of 1%-CMC was further added and kneaded for 30 minutes. Then, 25 g of SBR (40% emulsion) used as a binder and 12.5 g of polymer particles (manufactured by Mitsui Chemicals, Inc., CHEMIPEARL (registered trademark) W4005, softening point of 110° C., 40% emulsion) were added to carry out Mix for 30 minutes, then vacuum defoam for 30 minutes. In the ...

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Abstract

A negative electrode which is to be used in a lithium-ion secondary battery and obtained by coating at least one surface of a negative electrode current collector with a negative electrode mixture layer, wherein the negative electrode mixture layer contains a negative electrode active material, a conductive aid, a binder, polymer particles exhibiting a softening point of 70-150DEG C, inclusive, and thermally expandable microcapsules having a maximum expansion volume temperature which is higher than the softening point of the polymer particles.

Description

technical field [0001] The present invention relates to a negative electrode including microcapsules, and more specifically, to a negative electrode composite material layer containing a negative electrode active material, a conductive auxiliary material, a binder, polymer particles having a softening point of 70° C. or higher and 150° C. or lower, and A negative electrode of thermally expandable microcapsules having a maximum volume expansion temperature higher than the softening point of the polymer particles, and a lithium ion secondary battery comprising the same. Background technique [0002] In recent years, lithium-ion secondary batteries have been widely used as power sources for electronic devices such as mobile phones and notebook computers, electric vehicles, and power storage. In particular, recently, the demand for batteries with high capacity, high output, and high energy density that can be mounted on hybrid vehicles and electric vehicles is rapidly expanding....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M2/16H01M4/62H01M50/417H01M50/489
CPCH01M4/13Y02E60/10H01M2004/027H01M4/625H01M4/621H01M4/622H01M10/0525H01M50/414H01M10/4235H01M50/417H01M50/489H01M4/62
Inventor 山本伸司远藤裕理
Owner MITSUI CHEM INC
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