Method for producing an electrochemical element

US7141333B2 · kind B2 · utility

Assignee

• VARTA MICROBATTERY GMBH · DE

Inventors

• Peter Birke · Hohen Neuendorf, DE
• Fatima Birke-Salam · Ellwangen, DE
• Thomas Woehrle · Munich, DE
• Peter Haug · Rielasingen-Worblingen, DE
• Konrad Holl · Aalen, DE
• Heinrich Stelzig · Ellwangen (Jagst), DE
• Dejan Ilic · Ellwangen (Jagst), DE

Key dates

• Filing date: Apr 29, 2003
• Grant date: Nov 28, 2006
• Expiry date: Jul 19, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49115
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A method for producing an electrochemical element having at least one lithium-intercollating electrode and an organic electrolyte, at least one positive electrode, at least one negative electrode and at least one separator are joined together to form an element, with the separator being a porous matrix composed of at least about 60% by weight of a ceramic material A, which contains lithium ions, and a polymer as a binding agent. The resulting element is then introduced into a housing and impregnated with a liquid organic electrolyte B, whose conductive salt contains lithium ions, so that the ionic total conductivity of the separator is formed by adding the ion conductivities of A and B and the reciprocal of the specific contact resistance of the phase boundary between A and B, and is then closed such that it is sealed. A copolymer composed of vinylidene fluoride and hexafluoropropylene is used as the binder polymer. Material A is a naturally occurring mineral.