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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of safety and security against internal short circuit, and achieve short circuit resistance. Prevents the deterioration of discharge characteristics and has an excellent disconnection effect

Active Publication Date: 2006-08-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above improved methods (for example, Japanese Laid-Open Patent Publications Nos. 2001-319634 and 2002-8730) are techniques for preventing dendrites or improving high-rate discharge characteristics, but they do not solve the problems of internal short-circuit resistance safety and nail penetration tests. security issues

Method used

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  • Nonaqueous electrolyte secondary battery
  • Nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (i) Manufacture of positive electrode

[0084] Mix 3kg of lithium cobalt oxide (positive electrode active material) and 1kg of #1320 (trade name, produced by Kureha Chemical Industry Co., Ltd., a NMP solution containing 12wt% PVDF (positive electrode binder) while stirring using a double-arm kneader ), 90g of acetylene black (conductive material) and an appropriate amount of NMP to prepare the positive electrode material mixed slurry. This slurry was applied to both surfaces of an aluminum foil (positive electrode current collector) having a thickness of 15 μm (excluding the positive electrode lead connecting member). The dry coating is rolled to form a positive electrode material mixture layer. Thus, a positive electrode ring was obtained. The electrode plate is composed of aluminum foil and a layer of positive electrode material mixture with a thickness of 160 μm. Thereafter, the positive electrode hoop was cut into a size of 60 mm in width and 500 mm in length. A...

Embodiment 2

[0108] (i) Manufacture of positive electrode

[0109] Mix 3kg lithium cobalt oxide (positive electrode active material) and 1kg#1320 (trade name, produced by Kureha Chemical Industry Co., Ltd., a kind of NMP solution containing 12wt% PVDF (positive electrode binder)) while stirring while using a double-arm kneader , 90g of acetylene black (conductive material) and an appropriate amount of NMP to prepare the positive electrode material mixed slurry. This slurry was applied to both surfaces of an aluminum foil (positive electrode current collector) having a thickness of 15 μm (excluding the positive electrode lead connecting member). The dry coating is rolled to form a positive electrode material mixture layer. During the formation of the positive electrode material mixture layer, the thickness of the electrode plate composed of the aluminum foil and the positive electrode material mixture layer was controlled at 160 μm. Then, the electrode plate was cut to a width that could ...

Embodiment 3

[0128] Batteries were manufactured in the same manner as in Example 2, except that in the preparation of the porous film coating, the time of primary mixing was changed to 10, 20, 45 and 60 minutes. The porosity P of the porous insulating film was 0.60, 0.60, 0.58 and 0.55, respectively. Therefore, the R-P values ​​are 0, 0, 0.02 and 0.05.

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Abstract

Disclosed is a nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, a nonaqueous electrolyte solution, and a porous insulating membrane bonded to the surface of at least one of the positive electrode and the negative electrode. The porous insulating membrane contains an inorganic oxide filler and a membrane binder. The ratio (R) of the true volume of the separator to the apparent volume is not less than 0.4 but not more than 0.7, and the ratio (R) and the porosity (P) of the porous insulating membrane satisfy the following relation: -0.10 <= R - P <= 0.30.

Description

technical field [0001] The invention relates to a non-aqueous electrolyte secondary battery, in particular to a lithium-ion secondary battery. A layer of porous insulating film is attached to the electrode surface, and has excellent thermal resistance, short-circuit resistance safety and discharge characteristics. Background technique [0002] Lithium-ion secondary batteries are used as main power sources for mobile communication devices and portable electronic devices due to their high electromotive force and high energy density. A typical lithium-ion secondary battery includes a positive electrode composed of a lithium composite oxide, a negative electrode composed of a material capable of absorbing and desorbing lithium ions, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. [0003] The separator layer serves to electrically insulate the positive and negative electrodes from ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/02H01M10/40H01M10/0525H01M50/486H01M50/491
CPCY02E60/122Y02E60/10
Inventor 井上薰加藤清美铃木刚平生田茂雄福本友祐林彻也
Owner PANASONIC CORP
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