Varta Microbattery Gmbh

Volkswagen Varta Microbattery Forschungsgesellschaft Mbh & Co. Kg

Fatima Birke-Salam

Heinrich Stelzig

Dejan Ilic

Peter Birke

Konrad Holl

Michael Moser

Peter Haug

Alfons Joas

Stefan Fürst

Claudia Rathmann

Ulrich Bosch

Dejan Illic

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.

Method for producing an electrochemical element

A thin electronic chip card with an IC chip and a galvanic element as an energy store, which has at least one lithium-intercalating electrode and has a thin, flexible housing comprising two metal foils, which bear directly against the electrodes and are connected to each other in a sealed manner with an adhesive or sealing layer, the element is arranged in a recess in the chip card and the chip card and the element are covered on both sides by an overlay plastic film, which is firmly bonded to the chip card and the element with an elastic stress-compensating adhesive, which adheres simultaneously on metals and plastics.

Thin electronic chip card and method of making same

A method for manufacturing galvanic elements having a liquid organic electrolyte that contain an electrode-separator assembly that has at least one lithium intercalating electrode in whose polymer matrix insoluble, electrochemically active materials are finely distributed in the polymer involved, the electrolyte contains about 2% to about 15% by weight of a hydrocarbon-oxygen compound (carbonate) that has a central carbon atom, to which one oxygen atom is doubly bonded and two oxygen are singly bonded, where the singly bonded oxygen is not saturated by any other atoms or groups and a hydrocarbon chain having a length of four carbon atoms or less is bonded to each of those singly bonded oxygen atoms and these two chains differ by at least one, but no more than three, CH groups, and this electrode-separator assembly is initially impregnated with this electrolyte, then cut to size, and subsequently inserted into a housing. The electrode-separator assemblies may be laminated onto conductors and/or counterelectrodes prior to their being impregnated with the electrolyte and may also be rolled up and then impregnated.

Method for manufacturing galvanic elements having a liquid organic electrolyte

Growing community of inventors

Ellwangen, Germany

Fatima Birke-Salam