Electrode for electrochemical device and electrochemical device

Inactive Publication Date: 2009-07-02
TDK CORPARATION
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]Such an electrode for electrochemical devices affords an el

Problems solved by technology

However, the inventors have found that leakage current increases when the lead arrangement spacing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrode for electrochemical device and electrochemical device
  • Electrode for electrochemical device and electrochemical device
  • Electrode for electrochemical device and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Example

Electric Double-Layer Capacitor (EDLC): Examples A1 to A3, Comparative Examples A1 and A2

[0060]A coating material was prepared by mixing activated carbon particles, as the active material, and PVDF as the binder, to a ratio active material: binder=70:30; then N-methyl pyrrolidone was added to the obtained mixture, and the whole was kneaded. The coating material was coated, using a doctor blade, onto both faces of 30 μm aluminum foil, except at the portion intended for lead placing. The resulting coating films were then dried. The aluminum foil having formed thereon the coating films was then punched into a rectangle, and then a lead having a width A of 2 mm, a length of 25 mm and a thickness of 0.1 mm was ultrasonically welded to the uncoated portion of the collector, as illustrated in FIG. 1, to yield a pair of electrodes for an electric double-layer capacitor. The length Lo of the collector in the longitudinal direction, and distances La, Lb from the ends of the collector to the l...

Example

Electric Double-Layer Capacitor: Examples A4 to A5, Comparative Examples A3 and A4

Example

[0062]Electric double-layer capacitors were obtained in the same way as in Example 1, but using herein 17 μm-thickness copper foil instead of aluminum foil, with L0, La and Lb set as in FIG. 7.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Temperatureaaaaaaaaaa
Angleaaaaaaaaaa
Login to view more

Abstract

An electrode for an electrochemical device, including an elongated collector, a lead provided halfway along a longitudinal direction of the collector, and active material layers provided on the collector, wherein when La (m) is a distance from one end of the collector, in the longitudinal direction, up to the lead, and Lb (m) is a distance from the other end of the collector, in the longitudinal direction, up to the lead, and ρ (Ωm) is a resistivity of the collector at 25°, where Lopt (m) being 1.9×106ρ, the La (m) and Lb (m) are from 0.95 Lopt to 1.05 Lopt respectively.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an electrode for electrochemical devices, and to an electrochemical device.[0003]2. Related Background Art[0004]Spirally wound electrochemical devices are formed by winding electrodes in the longitudinal direction, the electrodes being obtained by forming active material layers on an elongated collector. When the length of the collector in the longitudinal direction is substantial, the collector is provided with a plurality of leads, spaced apart from each other, in the longitudinal direction of the collector, in order to suppress heat generation, polarization and the like that result from concentration of large currents (see, for instance, Japanese Patent Application Laid-open Nos. H7-192717, H11-283882, H11-283883, H11-317218, 2000-106167, 2000-182656, 2000-110453, 2006-260892 and 2006-286404).SUMMARY OF THE INVENTION[0005]During winding, same-polarity leads have conventionally been di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C25C7/02H01G11/66H01G11/70H01G11/74H01M4/13H01M4/66H01M50/533H01M50/536H01M50/538
CPCH01G9/008H01G9/016H01G9/06H01G9/151H01G11/72Y02E60/122H01M2/263H01M4/661H01M10/0431Y02E60/13H01G11/74Y02E60/10H01M50/538Y02P70/50H01M50/533H01M50/536
Inventor OHASHI, YOSHIHIKOHINOKI, KIYONORIKATAI, KAZUOKOBAYASHI, KEITA
Owner TDK CORPARATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap