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Diaphragm and nonaqueous electrolyte battery

A non-aqueous electrolyte and separator technology, applied in non-aqueous electrolyte batteries, battery electrodes, battery pack components, etc., can solve problems such as inability to obtain performance, achieve excellent impregnation characteristics and liquid retention characteristics, and improve battery characteristics.

Active Publication Date: 2011-07-20
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In research to realize high capacity and high safety of lithium-ion secondary batteries, sufficient performance may not be obtained when only polyolefin microporous membranes of the related art are used, and therefore, it is necessary to impart functions to polyolefin microporous membranes

Method used

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  • Diaphragm and nonaqueous electrolyte battery
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  • Diaphragm and nonaqueous electrolyte battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0028] 1. First Embodiment (Structure of Diaphragm)

[0029] 2. Second Embodiment (Example of Cylindrical Battery)

no. 3 approach

[0030] 3. Third Embodiment (Example of Flat Battery)

[0031] 1. First Embodiment

[0032] Hereinafter, a separator according to a first embodiment of the present invention is described.

[0033] (1-1) Structure of diaphragm

[0034] The separator 4 separates the positive electrode and the negative electrode from each other and allows lithium ions to pass therethrough while preventing short circuiting of current due to contact between the two electrodes. Such as figure 1 As shown, the separator 4 is composed of a base material layer 4a and a functional resin layer 4b. The base material layer 4a may be provided if necessary, and the separator 4 may be composed of only the functional resin layer 4b.

[0035] [Base material layer]

[0036] The base material layer 4a is composed of a microporous film made of polyolefin resin. Examples of polyolefin resins that can be used include polyethylene (PE), polypropylene (PP), and mixtures of these polyolefin resins. The polyolefin ...

no. 2 approach

[0079] In a second embodiment according to the present invention, a nonaqueous electrolyte battery using the above separator is described with reference to the drawings. image 3 A cross-sectional structure of a nonaqueous electrolyte battery according to a second embodiment of the present invention is shown.

[0080] (2-1) Structure of non-aqueous electrolyte battery

[0081] This nonaqueous electrolyte battery is of a so-called cylindrical type and has a wound electrode body 20 having a strip-shaped positive electrode 2 wound via a separator 4 and a strip-shaped positive electrode 2 inside a substantially hollow cylindrical battery case 1 . Negative pole 3.

[0082] The battery case 1 is made of, for example, nickel (NI)-plated iron (Fe), and one end thereof is closed and the other end is open. Inside the battery case 1 , a pair of insulating plates 5 and 6 are arranged perpendicularly to the wound peripheral surface, respectively, so as to sandwich the wound electrode bod...

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Abstract

The present invention provides a diaphragm and a nonaqueous electrolyte battery. The diaphragm according to the invention comprises a functional resin layer which comprises a resin material and an inorganic oxide filler. Furthermore the functional resin layer is provided with a porous interconnecting structure in which a plurality of holes are connected with one another and has a contact angle that is not larger than 11 DEG relatively to an electrolyte.

Description

technical field [0001] The invention relates to a diaphragm and a battery using the diaphragm. More particularly, the present invention relates to a separator that insulates a positive electrode and a negative electrode from each other and a battery using the separator. Background technique [0002] In recent years, due to the remarkable development of portable electronic technology, mobile phones and laptop personal computers have been recognized as basic technologies for supporting a highly computerized society. Research and development on high functionalization of these devices is being actively promoted, and it is considered to have a problem of shortening of driving time because of increase in power consumption due to high functionalization. [0003] In order to secure a driving time above a certain level, since it is a necessary condition for realizing high energy density of a secondary battery used as a driving power source, for example, a lithium ion secondary batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/05H01M50/451
CPCY02E60/12H01M4/625Y02E60/122H01M4/1395H01M4/581Y02E60/10H01M50/451H01M10/05H01M50/446H01M50/449H01M50/491H01M50/463H01M50/443H01M50/426H01M50/417H01M10/42H01M2010/4292
Inventor 手岛由香子梶田笃史山本健介林正健
Owner MURATA MFG CO LTD
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