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Collector, electrode, secondary cell, and capacitor

A current collector and electrode technology, applied in the field of current collectors

Inactive Publication Date: 2015-07-22
FURUKAWA ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is still room for improvement in countermeasures against abnormal heat caused by overcharging, etc.

Method used

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  • Collector, electrode, secondary cell, and capacitor
  • Collector, electrode, secondary cell, and capacitor
  • Collector, electrode, secondary cell, and capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Resin A (acid-modified polypropylene latex, melting point 138.6 ° C, solid content 29.5%, number average particle diameter 0.3 μm, weight average molecular weight 80000), acetylene black (hereinafter referred to as AB) and silica (colloidal silica , particle size 450nm, solid content 40%) after mixing, the coating liquid was stirred with a disperser (Disperse) (resin A: AB: silica=85:10:5 (volume ratio), solvent is water). The prepared coating solution was applied to an A1085 foil (thickness 15 μm) so that the thickness of the coating film was 2 μm, and dried at 100° C. and 140° C. for 1 minute respectively to obtain a CC foil having a film thickness of 2.2 μm. In addition, the latex of the above-mentioned resin A had good coatability with respect to the A1085 foil (the phenomenon of coating unevenness was found to be few when observed with the naked eye).

Embodiment 2

[0110] After mixing resin A, AB and silicon dioxide (colloidal silicon dioxide, particle size 450nm, solid content 40%), stir the coating solution with a disperser (resin A:AB:silica=80:10:10( volume ratio), the solvent is water). The prepared coating solution was applied to an A1085 foil (thickness 15 μm) so that the thickness of the coating film was 2 μm, and dried at 100° C. and 140° C. for 1 minute respectively to obtain a CC foil having a film thickness of 2.2 μm. In addition, the latex of the above-mentioned resin A had good coatability with respect to the A1085 foil (the phenomenon of coating unevenness was found to be few when observed with the naked eye).

Embodiment 3

[0112] After mixing resin A, AB and alumina (fine particles of alumina, particle size 700nm), stir the coating solution with a disperser (resin A:AB:alumina=80:10:10 (volume ratio), solvent is water) . The prepared coating solution was applied to an A1085 foil (thickness 15 μm) so that the thickness of the coating film was 2 μm, and dried at 100° C. and 140° C. for 1 minute respectively to obtain a CC foil having a film thickness of 2.2 μm. In addition, the latex of the above-mentioned resin A had good coatability with respect to the A1085 foil (the phenomenon of coating unevenness was found to be few when observed with the naked eye).

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Abstract

Provided is a collector achieving an adequate safety function during cell deformation due to external pressure, or internal pressure increase, and an electrode, a secondary cell, or a capacitor using said collector. Provided is a collector provided with a metal foil and a conductive layer formed on the surface of the metal foil. The collector is characterized by being sandwiched between brass electrodes having a diameter of 1 cm, and in that on a temperature-resistance curve for the collector at which a load of 15N is applied between the electrodes and temperature increases from room temperature at a rate of 10°C / minute, at a temperature higher than a temperature at which a resistance R(T) at temperature T and a resistance R(T-5) at a temperature T-5°C initially fulfill the condition (R(T) / R(T-5))> 2.0, if a temperature initially fulfilling the condition (R(T) / R(T-5))< 2.0 is defined as Ta, then the resistance R(Ta+5) at Ta+5°C and the resistance R(Ta-5) at Ta-5°C fulfill the condition R(Ta+5) / R(Ta-5)≥1.

Description

【Technical field】 [0001] The invention relates to a current collector, an electrode, a secondary battery and a capacitor. 【Background technique】 [0002] Because of the high energy density, the application of lithium-ion batteries in electronic products such as mobile phones or laptop computers is becoming more and more popular. Lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, etc. are used in the positive electrode active material of the lithium ion battery; graphite, etc. are used in the negative electrode active material. Generally, a lithium-ion battery is composed of an electrode composed of an active material, a porous sheet separator, and an electrolyte in which a lithium salt is dissolved. Such a lithium ion battery has a large battery capacity, high power, good charge and discharge characteristics, and a long service life. [0003] Although lithium-ion batteries have the advantage of high energy density, there are still safety issues due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01G11/68H01M4/13H01M4/64
CPCH01G11/68H01C7/02H01M4/667Y02E60/13H01M4/661H01G11/70H01M4/668H01M10/052H01M4/622H01M4/663H01M4/664H01M2200/106Y02E60/10H01G11/24
Inventor 饭田恭宏盛岛泰正伊藤贵和原英和片冈次雄山部乡史井上光哉加藤治齐藤聡平本川幸翁八重樫起郭
Owner FURUKAWA ELECTRIC CO LTD
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