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Lithium ion secondary battery

A secondary battery, lithium ion technology, used in secondary batteries, battery electrodes, circuits, etc., can solve the problems of large reaction heat, expansion, accelerated battery temperature rise, etc., and achieve the effect of excellent short-circuit prevention and excellent heat resistance.

Inactive Publication Date: 2008-11-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when a protruding object with a sharp shape like a nail penetrates the battery, the short-circuited part may expand, thereby generating a large amount of heat of reaction, thereby accelerating the temperature rise in the battery

Method used

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  • Lithium ion secondary battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] In addition to forming a solid electrolyte layer on both sides of the negative electrode ring, and a glassy composition (YC-LC powder (trade name) produced by OHARA INC., the long axis is 1 μm, and the composition is: LiCl-Li 2 O-P 2 o 5 ) was used for solid electrolyte particles having a scaly shape and ion conductivity, and a cylindrical lithium-ion secondary battery was manufactured in the same manner as in Comparative Example 1.

[0081] Specifically, a paste was prepared by stirring 970 g of solid electrolyte particles, 30 g of modified acrylonitrile rubber (solid component of BM-720H (trade name) produced by ZEON Corporation) and an appropriate amount of NMP using a double-arm kneader . The same operation as in Comparative Example 1 was carried out except that the paste was applied to both sides of the negative electrode ring, followed by drying to form a 5 μm thick solid electrolyte layer on each side.

Embodiment 2

[0083] A solid electrolyte layer was formed on both sides of the negative electrode ring in the same manner as in Example 1 except that the thickness of the solid electrolyte layer on each side was changed to 20 μm. In addition, a cylindrical lithium ion secondary battery was fabricated in the same manner as in Comparative Example 1 except that the negative electrode ring was used and no separator was used.

Embodiment 3

[0085] Except for the glassy composition (YC-LC powder (trade name) produced by OHARA INC., the long axis is 1 μm, and the composition is: LiCl-Li 2 O-P 2 o 5 ) is used for solid electrolyte particles having a scaly shape and ion conductivity, and α-alumina having an average particle diameter of 0.3 μm is used for an inorganic oxide filler to form a solid electrolyte layer on both sides of the negative electrode ring, A cylindrical lithium ion secondary battery was produced in the same manner as in Comparative Example 1.

[0086] Specifically, 490 g of solid electrolyte particles, 480 g of inorganic oxide filler, 30 g of modified acrylonitrile rubber (solid content of BM-720H (trade name) produced by ZEON Corporation) and an appropriate amount of NMP were stirred by using a double-arm kneader. , to prepare the paste. The same operation as in Comparative Example 1 was carried out except that the paste was applied to both sides of the negative electrode ring, followed by dryi...

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Abstract

Disclosed is a lithium ion secondary battery comprising a positive electrode containing a lithium complex oxide, a negative electrode capable of charging / discharging lithium ions, a nonaqueous electrolyte solution, and a solid electrolyte layer interposed between the positive electrode and the negative electrode. The solid electrolyte layer contains solid electrolyte particles and a binder, and may further contain an inorganic oxide filler. For example, the solid electrolyte particles are composed of at least one material selected from the group consisting of LiCl-Li2O-P2O5, LiTi2(PO4)3-AlPO4, LiI-Li2S-SiS4, LiI-Li2S-B2S3, LiI-Li2S-P2O5 and Li3N.

Description

technical field [0001] The present invention relates to a highly safe lithium ion secondary battery having excellent charge / discharge characteristics, short circuit prevention and heat resistance. Background technique [0002] A chemical battery such as a lithium ion secondary battery includes a separator positioned between the positive and negative electrodes to provide electrical insulation between the individual electrode plates and also to hold the electrolyte. A microporous film sheet comprising a resin such as polyethylene is mainly used as a separator at present. However, a resin-containing film sheet generally tends to thermally shrink due to heat of reaction originating from a short circuit that is immediately generated when an internal short circuit occurs. For example, when a protruding object with a sharp shape like a nail penetrates the battery, the short-circuited portion may expand to generate a large amount of reaction heat, thereby accelerating temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/36H01M4/02H01M4/62H01M10/0525H01M10/056
CPCY02E60/12Y02E60/10
Inventor 中岛润二大畠积井上利弘
Owner PANASONIC CORP