Separator for non-aqueous electrolyte battery and non-aqueous electrolyte battery

A non-aqueous electrolyte and separator technology, applied in non-aqueous electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as reducing the charge-discharge cycle characteristics, and achieve the effect of good cycle characteristics

Inactive Publication Date: 2006-01-25
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, here, the purpose is to use the heat resistance of the amide polymer to increase the short-circuit temperature. In order to reduce the thickness of the separator without reducing the battery characteristics such as charge-discharge cycle characteristics, it is not yet clear what characteristics are required as a separator. Research

Method used

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  • Separator for non-aqueous electrolyte battery and non-aqueous electrolyte battery
  • Separator for non-aqueous electrolyte battery and non-aqueous electrolyte battery
  • Separator for non-aqueous electrolyte battery and non-aqueous electrolyte battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 9～10

[0075] [Fabrication of Separator Formed from Laminated Microporous Membrane]

[0076] Polyamide having a structure shown below and having a melting point of 295° C. was used as the heat-resistant resin.

[0077] 【Chemical 4】

[0078] -[-R-(C=O)-NH-] n -

[0079] In the above structural formula, R represents a hydrocarbon group as shown below.

[0080] 【Chemical 5】

[0081] R=-CH 2 -CH 2 -C 6 h 4 -CH 2 - (bonding substituent at para position)

[0082] The above-mentioned polyamide was dissolved in an NMP solvent to a concentration of 1 mol / liter to prepare a heat-resistant resin solution. This resin solution was applied to a predetermined thickness on a polyethylene microporous membrane (thickness 4 μm, air permeability 190 seconds) used for the separator of Comparative Example 1 described later, and then immersed in water to release the resin solution into the water. The NMP in the resin coating film is removed, and the polyamide film is precipitated. A microporous...

Embodiment 4～6

[0085] A polyethylene microporous membrane with a thickness of 5 μm and an air permeability of 190 seconds was used in Example 4, a polyethylene microporous membrane with a thickness of 7 μm and an air permeability of 175 seconds was used in Example 6, and a thickness of 8 μm was used in Example 6. In addition, the polyethylene microporous membrane having an air permeability of 190 seconds formed a heat-resistant layer made of polyamide in the same manner as above. The thickness of the heat-resistant layer was 2 μm in Example 4, 3 μm in Example 5, and 2 μm in Example 6.

[0086]The air permeability of each obtained separator was measured, and the results are shown in Table 4. In addition, area shrinkage at 120°C, 130°C, 140°C, and 150°C was measured. The measurement results are shown in Table 4.

[0087] Here, the numbers in the column of film thickness in Examples 1 to 6 and Comparative Examples 9 to 10 are the film thickness of the polyethylene layer (polyolefin layer) and...

Embodiment 7

[0098] As the positive electrode active material, a lithium-transition metal composite oxide (lithium-nickel composite oxide) containing nickel, manganese, and cobalt shown in Table 5 as the transition metal was used instead of lithium-cobalt composite oxide (lithium cobaltate). Other than that, a lithium secondary battery was produced in the same manner as in Example 1.

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Abstract

The present invention provides a membrane that is used in non aqueous electrolyte batteries. And the present invention is characterized in that the membrane is formed by a micro-porous membrane that consists of a polyolefin layer and a heat-resistant layer, which overlap on each other. The heat-resistant layer is 1 Mu m to 4 Mu m thick and is formed by polyamide, polyimide, or polyamide imide, the melting point of which is above 180 DEG C. The air permeability of the membrane is less than 200 seconds. And the present invention can be used for preparing the membrane, which is used in non aqueous electrolyte batteries and has small thermal shrinkage, excellent heat resistance and excellent cycling characteristics, and also the non aqueous electrolyte batteries that adopt the membrane.

Description

technical field [0001] The present invention relates to a separator used in a nonaqueous electrolyte battery such as a lithium ion secondary battery or a lithium polymer secondary battery, and a nonaqueous electrolyte battery using the separator. Background technique [0002] With the popularization and expansion of portable devices, the capacity of batteries used as power sources has been increasingly required to be increased due to the enhancement of functions and the increase in power consumption. In particular, lithium-ion batteries and lithium polymer batteries are suitable for small and high-capacity applications due to their characteristics. Therefore, they are widely used as the main power supply of mobile devices such as mobile phones and personal computers, and their energy density is also required to be improved. [0003] However, in recent years, the development of new high-energy-density materials that replace lithium cobaltate used as the positive electrode act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08J5/22H01M10/40H01M4/58H01M4/48H01M4/04H01M10/05H01M10/0525H01M50/417H01M50/423H01M50/449H01M50/489
CPCH01M2/1686Y02E60/122H01M10/0565H01M10/052H01M2/1653H01M10/0525Y10T428/31757Y10T428/31721Y02E60/10H01M50/449H01M50/417H01M50/489H01M50/423H01M50/414H01M50/491H01M50/463H01M4/525H01M4/131H01M4/587H01M4/133
Inventor 井町直希吉村精司
Owner SANYO ELECTRIC CO LTD
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