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Lithium-ion secondary cell and method for manufacturing same

A secondary battery, lithium ion technology, used in secondary battery manufacturing, secondary battery, electrode manufacturing, etc., can solve the problems of high energy, high temperature heating, high voltage, etc., to avoid internal short circuits and ensure the adhesion strength. Effect

Inactive Publication Date: 2015-12-23
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, since such a lithium-ion secondary battery has high voltage and high energy, when an internal short circuit occurs in which the positive electrode and the negative electrode contact each other during charging, there is a possibility of high temperature and heat generation.

Method used

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  • Lithium-ion secondary cell and method for manufacturing same
  • Lithium-ion secondary cell and method for manufacturing same
  • Lithium-ion secondary cell and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060]

[0061] A paste is applied on both sides of an aluminum foil with a thickness of 20 μm as the positive electrode current collector. A paste obtained by mixing polyvinylidene fluoride (PVDF) as an agent in a weight ratio of 85:10:5, and adding and mixing N-methylpyrrolidone (NMP) as a dispersion solvent. The positive electrode mixture layer 1a has a width of 80 mm and a coating amount of 130 g / m 2 conditions for coating. Immediately thereafter, the insulating layer 5 is applied in the vicinity of the boundary between one side and the uncoated portion.

[0062]The insulating layer 5 was coated with a paste having a solid content of 30 wt % obtained by dispersing alumina powder having a particle diameter of 0.8 μm as an insulating material in a solution in which PVDF was dissolved in NMP. Then, the mixed layer 13 is formed between the positive electrode mixture layer 1 a and the insulating layer 5 by standing still for a predetermined mixing time before being placed i...

Embodiment 2

[0072] The lithium ion secondary battery 22 of Example 2 has the same structure as the lithium ion secondary battery 22 described in Example 1, except for the insulating layer 5 . Therefore, only the insulating layer 5 will be described.

[0073]

[0074] About the insulating layer 5, the solution which melt|dissolved the mixture of a bisphenol-A type epoxy resin and an acrylic copolymer in NMP was applied, and it manufactured using the method similar to Example 1 except this. As for the epoxy-based resin, resins other than those described above may be used.

[0075] Except for this, the lithium ion secondary battery 22 was produced in the same manner as in Example 1.

[0076] In the positive electrode 1 manufactured in embodiment 1, 2, such as Figure 6 As shown, by forming the mixed layer 13 , sufficient adhesion strength is ensured, and no gap is formed between the positive electrode mixture layer 1 a and the insulating layer 5 , and the risk of internal short circuit c...

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Abstract

The present invention addresses the problem of providing a lithium-ion secondary cell in which adequate insulation layer adhesion strength can be obtained, a gap can be prevented from being generated between the insulation layer and the electrode mix layer, and an internal short circuit can be prevented from occurring. The present invention is a lithium-ion secondary cell (22) provided with a flat-shaped electrode group (21) in which separators (3, 4) are interposed between a positive electrode (1) and a negative electrode (2), the positive electrode (1) having a positive electrode collector, a positive electrode mix layer (1a) formed on the surface of the positive electrode collector, and an insulation layer (5) formed on the surface of the positive electrode collector and along the edge part of the positive electrode mix layer (1a). A mixture layer (13), formed by mixing a positive electrode mix constituting the positive electrode mix layer (1a) and an insulating material constituting the insulation layer (5), is interposed between the positive electrode mix layer (1a) and the insulation layer (5).

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, for example, a lithium ion secondary battery used in power sources for electric vehicles, hybrid vehicles, and the like, and a method for manufacturing the same. Background technique [0002] In recent years, long-life batteries with high energy density and excellent input / output characteristics are required as power sources for electric vehicles, hybrid vehicles, and the like. In addition, from the viewpoint of emphasizing environmental performance, automobiles tend to run on batteries, and batteries with large capacity are required. [0003] The lithium ion secondary battery has: a negative electrode using a carbon material capable of intercalating and deintercalating lithium ions as an active material; a positive electrode using a lithium transition metal composite oxide capable of intercalating and deintercalating lithium ions as an active material; Separator made of porous resin fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M2/34H01M4/139
CPCH01M4/13H01M4/139H01M10/0431H01M10/0587H01M2004/021H01M50/46Y02E60/10H01M4/0404H01M10/0525H01M2004/028
Inventor 有岛康夫纲木拓郎
Owner HITACHI AUTOMOTIVE SYST LTD
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