Separator, battery using the same, and method for manufacturing separator

A separator and battery technology, applied in the direction of organic electrolyte batteries, secondary batteries, battery pack components, etc., can solve problems such as the inability to obtain capacity, and achieve the effects of improving safety, preventing secondary defects, and reducing thermal shrinkage

Active Publication Date: 2009-01-07
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In terms of high capacity and high safety of lithium ion secondary batteries, sufficient capacity cannot be obtained by using only a fine porous film of polyolefin resin in the related art

Method used

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  • Separator, battery using the same, and method for manufacturing separator
  • Separator, battery using the same, and method for manufacturing separator
  • Separator, battery using the same, and method for manufacturing separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] The viscous liquid product containing only the polysilazane compound was coated as a precursor onto a 16 μm thick polyethylene microporous film by a desktop coater, and then placed in a water bath. Thereafter, the resulting product was dried by hot air to form a separator 104 having an exposed layer 104a made of polyethylene and a cover layer 104b of a microframe 104c of a polyethylene microporous film coated with a glass layer 104d. In addition, the thickness of the glass layer 104d was measured with a thickness gauge, and it was 2 μm. In this regard, both "the thickness of the polyethylene microporous film" and "the thickness of the separator 104 having the exposed layer 104a and the cover layer 104b" were measured with a thickness gauge. Substituting these values ​​into the following equation yields the thickness of the glass layer 104d.

[0125] (equation)

[0126] ("thickness of glass layer 104d")=("thickness of separator 104 having exposed layer 104a and cover l...

Embodiment 2

[0134] The battery of Example 2 was manufactured according to the same method described in Example 1, except that the amount of the viscous liquid product containing only polysilazane compounds as a precursor was adjusted so that when the separator 104 was produced, the thickness of the glass layer 104d was 0.5 μm.

Embodiment 3

[0136] The battery of Example 3 was fabricated according to the same method described in Example 1, except that the amount of the viscous liquid product containing only the polysilazane compound as a precursor was adjusted so that when the separator 104 was produced, the thickness of the glass layer 104d was 0.3 μm.

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Abstract

The invention relates to a separator, a battery using the separator and a method for manufacturing the separator. The invention provides a separator comprising: a covering layer in which a fine framework of polyolefin resin is coated with a glass layer. The invention also provides a battery comprising a cathode, an anode, an electrolyte, and the separator having the covering layer in which the fine framework of polyolefin resin is coated with the glass layer. A method for manufacturing the separator is also provided, including the step of: coating a precursor containing viscous liquid productwhich contains only polysilazane compound or a mixture of viscous liquid product which contains only polysilazane compound with polycarbosilazane compound to the polyolefin resin, placing the precursor applied polyoleline resin in a water bath to dry, such that a fine framework of polyolefin resin is coated with the glass layer. The inventive proposal reduces heat contractibility of the separatorand acquires excellent electrolyte soakage performance without impairing ionic conductivity.

Description

[0001] Cross References to Related Applications [0002] The present application contains subject matter related to Japanese Patent Application No. 2007-179088 filed on Jul. 6, 2007 and Japanese Patent Application No. 2007-235392 filed on Sep. 11, 2007, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a separator, a battery using the same, and a method of manufacturing the separator. Background technique [0004] With the remarkable development of portable electronic products in recent years, portable phones and notebook computers have been recognized as fundamental technologies of a highly information-oriented society. Research and development concerning high performance of these devices has been intensively conducted. Since energy consumption increases with high performance, it is necessary to shorten the driving time. In order to ensure a driving time exceeding a certain level, it is necessary t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/40H01M6/16C08J5/22C08J5/18H01M10/0565H01M10/0566
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 梶田笃史手岛由香子井本浩田中健彦堀内博志
Owner MURATA MFG CO LTD
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