Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

a technology of nonaqueous electrolyte and secondary battery, which is applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of low effect of preventing an internal short-circuit due to foreign matter contamination, low resistance internal short-circuit, and deterioration of battery characteristics, so as to suppress the occurrence of low-resistance internal short-circuit, the effect of reducing the quantity of hea

Active Publication Date: 2017-06-29
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new design for the positive electrode in a battery that prevents short-circuiting and reduces heat generation. This design can prevent the occurrence of short-circuiting even if there is foreign matter on the battery, which can cause damage. This design helps to maintain the battery's performance and prevents overheating.

Problems solved by technology

If foreign matter enters between the exposed portion and the negative electrode and breaks through the separator, the exposed portion may come into contact with the negative electrode to cause a low-resistance internal short-circuit, which generates a flow of a large current and thereby generates large heat.
However, since the insulating layer disclosed in Japanese Unexamined Patent Application Publication No. 2013-45659 is a thin film layer made of only a binder resin, the effect of preventing an internal short-circuit due to contamination of foreign matter is low.
In particular, if the size of foreign matter is large, it is inferred that the effect of the insulating layer preventing an internal short-circuit is insufficient.
It is, however, difficult to reduce the quantity of heat by the technology disclosed in Japanese Unexamined Patent Application Publication No. 2013-45659.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Production of Positive Electrode

[0053]Aluminum oxide (Al2O3, 93.5 parts by weight), acetylene black (AB, 5 parts by weight), and polyvinylidene fluoride (PVdF, 1.5 parts by weight) were mixed. An appropriate amount of N-methyl-2-pyrrolidone (NMP) was further added to the mixture to prepare a slurry. The slurry was then applied onto both surfaces of a long positive electrode current collector of aluminum foil having a thickness of 15 μm and was dried to form a protective layer having a thickness of 6 μm and a surface density of 10 g / m2.

[0054]A lithium-containing transition metal oxide (97 parts by weight) represented by LiNi0.5Co0.2Mn0.3O2 serving as a positive electrode active material, acetylene black (AB, 2 parts by weight), and polyvinylidene fluoride (PVdF, 1 part by weight) were mixed. An appropriate amount of N-methyl-2-pyrrolidone (NMP) was further added to the mixture to prepare a positive electrode mixture slurry. The positive electrode mixture slurry was then applied to th...

example 2

[0059]A battery was produced as in Example 1 except that the protective layer had a surface density of 5 g / m2 and a thickness of 3 μm.

example 3

[0060]A battery was produced as in Example 1 except that the protective layer had a surface density of 1.6 g / m2 and a thickness of 1 μm.

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PUM

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Abstract

The positive electrode as an embodiment includes a positive electrode current collector mainly composed of aluminum, a positive electrode mixture layer containing a lithium-containing transition metal oxide and disposed above the positive electrode current collector, and a protective layer disposed between the positive electrode current collector and the positive electrode mixture layer. The protective layer contains inorganic particles, an electro-conductive material, and a binding material; is mainly composed of the inorganic particles; and is disposed on the positive electrode current collector to cover the positive electrode current collector in approximately the entire area where the positive electrode mixture layer is disposed and at least a part of the exposed portion of the positive electrode current collector where the positive electrode mixture layer is not disposed on the surface of the positive electrode current collector.

Description

BACKGROUND[0001]1. Technical Field[0002]The present disclosure relates to a positive electrode for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery.[0003]2. Description of the Related Art[0004]A positive electrode for a nonaqueous electrolyte secondary battery (hereinafter, simply referred to as “positive electrode”) includes a positive electrode current collector and a positive electrode mixture layer on the current collector. The positive electrode has a portion serving as a lead to be electrically connected to, for example, a positive electrode terminal, and the portion includes an exposed portion where the positive electrode mixture layer is not formed to expose the surface of the current collector. In order to secure smooth movement of lithium ions between positive and negative electrodes, the positive electrode is designed to be smaller than the negative electrode. In such a case, the exposed portion of the positive electrode current co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/36H01M10/0525H01M10/0585H01M4/485H01M4/66
CPCH01M4/366H01M4/485H01M4/661H01M4/667H01M10/0585H01M10/0525H01M2004/028H01M4/131H01M10/052Y02E60/10Y02P70/50
Inventor ENDO, KAZUKI
Owner PANASONIC CORP
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