Electrochemical device

a technology of electrochemical devices and secondary cells, applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of negative electrodes not being able to occlude or desorb lithium ions, relatively short cycle life of lithium ion secondary cells, and unsatisfactory, so as to improve productivity and cycle characteristics, the effect of reducing resistan

Inactive Publication Date: 2012-05-31
TAIYO YUDEN KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention proposes an electrochemical device that improves productivity and cycle performance while reducing resistance. It achieves this through various technical features such as designing specific materials or operating conditions for each purpose.

Problems solved by technology

The technical problem addressed in this patent text relates to finding ways to enhance the performance of lithium ion batteries without reducing their cycle durability. Specifically, there is a desire to develop a negative electrode material that can effectively store lithium ions during charging and discharging cycles without causing damage to the lithium ion capacitor.

Method used

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  • Electrochemical device
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Embodiment Construction

[0050]Modes for carrying out the invention are explained below by referring to the drawings.

[0051]FIGS. 1 to 3 all illustrate a lithium ion capacitor of button or coin type representing one embodiment of the present invention. This lithium ion capacitor comprises: an electricity storage element B formed by a positive electrode 10, a separator 30 and a negative electrode 20 laminated to each other; a case 40 having a concaved section 40a in which to accommodate the electricity storage element B; a ring-shaped gasket 50a contacting an inner periphery of a side wall 40b of the case 40; and a lid 50 that closes the concaved section 40a of the case 40 via the gasket 50a and thereby seals the electricity storage element B and non-aqueous electrolyte in the case 40. The case 40 and lid 50 can be made of any conductive material, such as stainless steel, aluminum, nickel, copper or titanium. The gasket 50a should ideally be made of material offering high electrical insulation property and low p

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Abstract

In an exemplified lithium ion capacitor, a negative electrode 20 has a first layer 21 and a second layer 22, the first layer 21 and second layer 22 are laminated to each other, and a lithium metal sheet 60 is placed between the first layer 21 and second layer 22, and accordingly one side of the lithium metal sheet 60 in the thickness direction contacts the first layer 21, while the other side in the thickness direction contacts the second layer 22. Since lithium in the lithium metal sheet 60 is easily doped by an active material near a contact part, the fact that both sides of the lithium metal sheet 60 in the thickness direction contact an active material allows for efficient pre-doping and consequent improvement of productivity.

Description

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Claims

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Application Information

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Owner TAIYO YUDEN KK
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