Unlock instant, AI-driven research and patent intelligence for your innovation.

Electrochemical capacitor

A capacitor and electrochemical technology, applied in the direction of electrolytic capacitors, capacitors, capacitor parts, etc., can solve the problems of negative electrode potential rise, lithium precipitation, lithium piercing diaphragm, etc.

Inactive Publication Date: 2013-10-23
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, if the electrochemical capacitor is quickly and repeatedly charged and discharged, the potential of the negative electrode may increase during the charge and discharge, and the potential difference between the positive and negative electrodes may decrease.
As a result, the energy density per unit volume of the electrochemical capacitor may decrease
[0010] In addition, since the potential of the negative electrode rises, there is a possibility that lithium embedded in the electrode layer of the negative electrode may be precipitated out of the negative electrode.
The precipitated lithium may pierce the separator, etc., causing a short circuit

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
  • Electrochemical capacitor
  • Electrochemical capacitor
  • Electrochemical capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] figure 1 It is a partially cutaway perspective view of the electrochemical capacitor according to the embodiment of the present invention.

[0023] The electrochemical capacitor 200 has a capacitor element 1 , an electrolytic solution (not shown), and a bottomed outer case 6 which is an outer package housing the capacitor element 1 and the electrolytic solution. Capacitor element 1 has positive electrode 2 , negative electrode 3 provided to face positive electrode 2 , and separator 4 provided between positive electrode 2 and negative electrode 3 . The positive electrode 2 has a current collector 2a made of metal, and a polarizable electrode 2b formed on the surface of the current collector 2a. The polarizable electrode layer 2 b is composed of activated carbon or the like as a positive electrode layer capable of intercalating and deintercalating ions. The negative electrode 3 has a current collector 3 a made of copper, and a negative electrode layer 3 b formed on the...

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
Viscosityaaaaaaaaaa
Login to View More

Abstract

An electrochemical capacitor includes electrolytic solution, a capacitor element, and a housing. The electrolytic solution contains cations, anions, solvent formed of materials other than lactones, and a lactone component. The capacitor element includes a negative electrode, a positive electrode, and a separator. The negative electrode includes an electrode layer capable of storing the cations, and the positive electrode includes a polarizable electrode layer and confronts the negative electrode. The separator is disposed between the negative and positive electrodes, and they are layered or wound together. The capacitor element is impregnated with the electrolytic solution. The housing accommodates the capacitor element and the electrolytic solution that contains the lactone component in a quantity ranging from 0.001 wt % to 5 wt % (inclusive) relative to the solvent.

Description

technical field [0001] The present invention relates to an electrochemical capacitor used for various electronic devices, backup power regeneration of hybrid vehicles and fuel cell vehicles, or power storage. Background technique [0002] Figure 5A is a horizontal sectional view of a conventional electrochemical capacitor. Figure 5B It is a partially cutaway front view of a conventional wound electrode unit 100 of an electrochemical capacitor. [0003] A conventional electrochemical capacitor has a wound electrode unit 100 , lithium metals (lithium electrodes) 104 and 105 , and an outer container 106 . The wound electrode unit 100 is formed by stacking the separators 103 interposed between the positive electrode 101 and the negative electrode 102 and winding them concentrically. Lithium metals 104 and 105 as lithium ion supply sources are respectively disposed on the outer peripheral portion and the central portion of the wound electrode unit 100 . The wound electrode u...

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): H01G11/60H01G11/58
CPCH01G9/028Y02T10/7022Y02E60/13H01G9/038H01G11/58Y02T10/70
Inventor 土井将太郎岛本秀树野本进
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD