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Metal three-dimensional, mesh-like porous body for collectors, electrode, and non-aqueous electrolyte secondary battery

A metal porous body, non-aqueous electrolyte technology, applied in the field of current collectors, can solve the problems of high internal resistance, high cost, and the output of lithium ion secondary batteries is not improved, and achieves low internal resistance, reduced manufacturing costs, high output effect

Inactive Publication Date: 2014-12-10
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, there are cases where a lithium ion secondary battery using the thus-produced three-dimensional network metal porous body as a current collector for an electrode exhibits high internal resistance, so that the output of the lithium ion secondary battery is not improved
Since it is necessary to add conductive additives and active materials to such lithium ion secondary batteries in order to reduce internal resistance, there is a problem of high cost

Method used

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  • Metal three-dimensional, mesh-like porous body for collectors, electrode, and non-aqueous electrolyte secondary battery
  • Metal three-dimensional, mesh-like porous body for collectors, electrode, and non-aqueous electrolyte secondary battery
  • Metal three-dimensional, mesh-like porous body for collectors, electrode, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142]

[0143] (non-woven fabric)

[0144] Nonwoven fabric (thickness: 1mm, porosity: 94%, unit Area of ​​non-woven fabric weight: 60g / m 2 , 30% cumulative pore diameter (D30): 32 μm).

[0145] (formation of conductive layer)

[0146] Using the sputtering method, on the surface of the obtained non-woven fabric, the weight per unit area is 10g / m 2 To deposit aluminum to form a thin film, thereby forming a conductive layer.

[0147] (Molten Salt Plating)

[0148] A nonwoven fabric having a conductive layer formed on its surface was used as a workpiece. Fix the workpiece on the fixture with power supply function, then place the fixture in the glove box, which has been kept in an argon atmosphere and low humidity environment (dew point: below -30°C), and then immerse the fixture at a temperature of 40 ℃ molten salt aluminum plating bath (composition: 33 mol% of 1-ethyl-3-methylimidazolium chloride (EMIC)-67 mol% of AlCl 3 ). The jig to which the workpiece was fixed was ...

Embodiment 2

[0153]

[0154] "Aluminum porous body 2" was obtained by performing the same operation as in Example 1, except that: as the nonwoven fabric, PP / PE composite fibers (fiber length: 50 mm, fiber diameter: 4.4dTex (25 μm) , core-sheath ratio: 1 / 1) obtained non-woven fabric (thickness: 1mm, porosity: 97%, weight per unit area: 30g / m 2 , 30% cumulative pore diameter ((D30)): 142 μm).

[0155] The porosity of "aluminum porous body 2" was 94%. The 30% cumulative pore diameter (D30) of the "aluminum porous body 2" was 130 μm.

Embodiment 3

[0166]

[0167] Utilize the sputtering method, on the surface of the non-woven fabric used in embodiment 1 with 10g / m 2 A weight per unit area of ​​copper is deposited to form a conductive layer. Next, a copper plating layer is formed on the surface of the nonwoven fabric by electroplating (copper weight per unit area: 400g / m 2 ), thus obtaining "copper-resin composite porous body 1". The obtained "copper-resin composite porous body 1" was heated to remove the nonwoven fabric by firing. Subsequently, the resulting product was heated in a reducing atmosphere to reduce copper, thereby obtaining "copper porous body 1" composed of copper.

[0168] The porosity of "copper porous body 1" was 96%. The 30% cumulative pore diameter (D30) of the "copper porous body 1" was 30 μm.

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Abstract

Provided are: a collector whereby internal resistance and production costs can be reduced; an electrode; and a non-aqueous electrolyte secondary battery. A metal three-dimensional, mesh-like porous body for use as a collector, comprising a sheet-shaped metal three-dimensional, mesh-like porous body; an electrode using same; and a non-aqueous electrolyte secondary battery comprising the electrode. The porosity of the sheet-shaped metal three-dimensional, mesh-like porous body is 90%-98%, and the 30% cumulative pore diameter (D30) of the sheet-shaped metal three-dimensional, mesh-like porous body, calculated by performing pore diameter measurement using the bubble-point method, is 20-100 µm.

Description

technical field [0001] The present invention relates to an electrode, a current collector having a three-dimensional mesh metal porous body, and a secondary battery having the electrode. Background technique [0002] In recent years, batteries used as power sources for portable electronic devices such as mobile phones and smartphones, and electric vehicles and hybrid vehicles each having an engine as a power source have been required to have high energy density. [0003] Research has been conducted on batteries that can achieve high energy density, including, for example, secondary batteries such as nonaqueous electrolyte secondary batteries characterized by high capacity. Among such secondary batteries, since lithium is a substance having a small atomic weight and high ionization energy, research on lithium secondary batteries as batteries capable of obtaining high energy density has been actively conducted in all fields. [0004] At present, as the positive electrode of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/74H01M4/38H01M4/485H01M4/505H01M4/525H01M4/66H01M10/0525H01M10/0562H01M10/058
CPCH01M4/80H01M4/485Y02T10/7011H01M4/505H01M4/661H01M4/525H01M4/745H01M4/74H01M10/0525H01M10/0562H01M4/808H01M4/587H01M2300/0068Y02E60/10Y02P70/50Y02T10/70H01M4/38H01M4/583H01M4/70H01M2220/20H01M2220/30
Inventor 西村淳一后藤和宏细江晃久吉田健太郎
Owner SUMITOMO ELECTRIC IND LTD