Secondary cell electrode and fabrication method, and secondary cell, complex cell, and vehicle

Abstract

In a nonaqueous electrolyte cell-oriented electrode (10), an electrode active material layer (12) formed on a collector (1) has a density gradient developed with a gradient of a varied concentration of a solid along a thickness from a surface of the electrode active material layer (12) toward the collector (1), and in a gel electrolyte cell-oriented electrode (30), an electrode active material layer (32) formed on a collector (1) has a density gradient developed with (a) gradient(s) of (a) varied concentration(s) of one or both of an electrolyte salt and a film forming material along a thickness from a surface of the electrode active material layer (32) toward the collector (1).

Description

[0001]The present application is a divisional of U.S. application Ser. No. 10 / 565,171, filed Jan. 19, 2006, which is the national stage entry of PCT / JP2004 / 011021, filed Jul. 27, 2004, which in turn claims benefit of priority to Japanese application Nos. 2003-283974 and 2003-283975, both filed Jul. 31, 2003, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a secondary cell electrode, and particularly, to a nonaqueous electrolyte electrode and a gel electrolyte electrode, and further to a fabrication method of the same, as well as to a secondary cell employing the secondary cell electrode, a complex cell employing the secondary cell, and a vehicle employing the secondary cell or the complex cell.BACKGROUND ART[0003]Recent years have observed, on the background with a rising trend for environmental protection, demands for a promoted introduction of an electric vehicle (EV), a hybrid vehicle (HEV), and a fuel cell p...

AI Technical Summary

Benefits of technology

The present invention provides a secondary cell electrode that works even at a high current rate by using an electrode active material layer low of the resistance to diffusion of Li ions supplied from an electrolyte layer, with a changed constitution of electrolyte in a patterning of the layer. This results in a three-dimensional uniformly concentrated electrode with improved performance such as charge or discharge capacity. The invention also provides a fabrication method for the electrode and a secondary cell, complex cell, and vehicle employing the secondary cell.

Problems solved by technology

As will be discussed later, such a laminate cell suffers an unfavorable tendency for Li ions to be exhausted in a charge or discharge at a high current rate, resulting in a reduced cell performance such as charge or discharge capacity.

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