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Electrode and electricity storage element

A technology for storage components and electrodes, applied in the direction of electrical components, positive electrodes, electrode carriers/collectors, etc.

Pending Publication Date: 2020-05-15
GS YUASA INT LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a short circuit occurs between the electrodes due to impacts such as falling or foreign matter mixed in during manufacturing, and as a result, excessive heat generation may occur

Method used

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  • Electrode and electricity storage element
  • Electrode and electricity storage element
  • Electrode and electricity storage element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] [Example 1] (production of positive electrode)

[0104] On the surface of an aluminum foil (average thickness: 15 μm) serving as a positive electrode base material, an intermediate layer was formed in the following manner. Weigh acetylene black (AB) and alumina (manufactured by Sumitomo Chemical Co., Ltd., with a particle size of about 300 nm and a BET specific surface area of ​​4.9 m) at a mass ratio of 8:77:15. 2 / g) and polyvinylidene fluoride (PVDF). These were mixed to N-methyl-2-pyrrolidone (NMP) as a dispersion medium to prepare a paste for intermediate layer formation. The paste for forming an intermediate layer was applied to an aluminum foil. Thereafter, drying was performed to obtain an intermediate layer having an average thickness of 8 μm.

[0105] Prepare Li(Ni 0.82 co 0.15 Al 0.03 )O 2 , AB, and PVDF, and a positive electrode active material layer-forming paste using N-methyl-2-pyrrolidone as a dispersion medium. The positive electrode active mate...

Embodiment 2

[0107] Weigh acetylene black (AB) and aluminum oxide (manufactured by AEROSIL Japan, with a particle size of about 70 nm and a BET specific surface area of ​​94 m) with a mass ratio of 8:62:30. 2 / g) and polyvinylidene fluoride (PVDF), they were mixed into N-methyl-2-pyrrolidone (NMP) as a dispersion medium to prepare a paste for intermediate layer formation, except that it was the same as in Example 1 Operation, obtain the positive pole of embodiment 2.

Embodiment 3

[0109] Acetylene black (AB), aluminum oxide (manufactured by Japan Aerosil Co.), a reaction product of bismaleimide and barbituric acid as a heat-crosslinkable compound were weighed at a mass ratio of 8:55:20:15, and polyvinylidene fluoride (PVDF), they were mixed into N-methyl-2-pyrrolidone (NMP) as a dispersion medium to prepare a paste for forming an intermediate layer, except that, the same operation as in Example 1 was obtained to obtain The positive electrode of Example 3.

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Abstract

One embodiment of the present invention is an electrode for electricity storage elements, which sequentially comprises a conductive substrate, an intermediate layer and an active material layer in this order, and which is configured such that: the intermediate layer contains a conductive agent, an inorganic oxide and a binder; and the content of the inorganic oxide in the intermediate layer is from 30% by mass to 90% by mass (inclusive).

Description

technical field [0001] The present invention relates to electrodes and storage elements. Background technique [0002] Secondary batteries represented by lithium-ion secondary batteries are often used in electronic equipment such as personal computers and communication terminals, automobiles, and the like due to their high energy density. Such electric storage elements such as secondary batteries and capacitors often have abnormalities such as heat generation and ignition due to unexpected use or the like. For example, a short circuit occurs between the electrodes due to impacts such as dropping or foreign matter mixed during manufacturing, and as a result, excessive heat generation may occur. [0003] In the prior art, a lithium-ion secondary battery has been disclosed as a technique for reliably blocking the charging current to ensure battery safety even if the battery temperature rises sharply due to an overcharged state. A substance (lithium carbonate) that decomposes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01G11/28H01M4/66H01M4/13H01M4/131
CPCH01M4/131H01G11/28Y02E60/10H01M10/4235H01M2200/106H01M2004/028H01M4/625H01M4/623H01M4/667H01M4/661H01M4/663H01M4/664H01G11/30H01M4/13H01M4/366
Inventor 辻田幸平大杉勇太田边森人向井宽亘幸洋田渊彻
Owner GS YUASA INT LTD