Varta Microbattery Gmbh

Varta Micro Innovation Gmbh

Technische Universitat Graz

Polymer Competence Center Leoben Gmbh

Dr. Wustinger Gmbh

Harald Kren

Stefan Koller

Andrea Droisner

Martin Schmuck

Franz Stelzer

Gisela Fauler

David E Fast

Robert Saf

Katharina Gallas

Michaela Scharfegger

Bernd Fuchsbichler

Sandra Pötz

Christian Baumann

A method of producing an electrochemical cell includes introducing lithium into the electrochemical cell such that an amount of mobile lithium contained in the cell available for incorporation and releasing processes in electrodes exceeds, after formation, the capacity of at least one positive electrode for taking up lithium at least by a factor of 1.1, and the at least one negative electrode in terms of its capacity for taking up lithium is dimensioned to a size sufficient to be capable of taking up the entire mobile lithium contained in the cell after formation, wherein the lithium is introduced at least partially into the electrochemical cell via the at least one negative electrode by pre-lithiating the at least one negative electrode prior to combination with the at least one positive electrode or by applying metallic lithium on a surface of the at least one negative electrode.

Lithium ion cell having improved ageing behavior

A composite material includes an electrochemically active organic material and an electrochemically active inorganic material. The organic material contains subunits according to formulae (I) and/or (II) wherein n is an integer not smaller than 2, Y represents an amide group (&#x2014;NH&#x2014;CO&#x2014; or &#x2014;CO&#x2014;NH&#x2014;), an ester group (&#x2014;O&#x2014;CO&#x2014; or &#x2014;CO&#x2014;O&#x2014;) or a urethane group (&#x2014;NH&#x2014;CO&#x2014;O&#x2014; or &#x2014;O&#x2014;CO&#x2014;NH&#x2014;), R, R, Rand Reach independently represent H, alkyl (preferably &#x2014;CH, &#x2014;CH), alkoxy-(preferably &#x2014;OCH, &#x2014;OCH), -halogen or &#x2014;CN, Arand Arindependently represent a bridging aryl group, Arand Arindependently represent a non-bridging aryl group, and Ris a bridging alkyl, alkene or aryl group.

Composite material, electrode, method of producing the material and the electrode and electrochemical cell

An electrode for an electrochemical element with an organic electrolyte includes a polymeric material containing or composed of subunits according to general formulae (I) and/or (II): wherein n is an integer &#x2265;2, Y represents an amide group (&#x2014;NH&#x2014;CO&#x2014; or &#x2014;CO&#x2014;NH&#x2014;), an ester group (&#x2014;O&#x2014;CO&#x2014; or &#x2014;CO&#x2014;O&#x2014;) or a urethane group (&#x2014;NH&#x2014;CO&#x2014;O&#x2014; or &#x2014;O&#x2014;CO&#x2014;NH&#x2014;), R, R, Rand Reach independently represent H, alkyl (preferably &#x2014;CH, &#x2014;CH), Alkoxy-(preferably &#x2014;OCH, &#x2014;OCH), -halogen or &#x2014;CN, Arand Arindependently represent a bridging aryl group, Arand Arindependently represent a non-bridging aryl group, and Ris a bridging alkyl, alkene or aryl group, wherein Arand Arin structures (I) and (II) independently represent a bridging aryl group.

Electrode for an electrochemical element with an organic electrolyte, electrochemical elements comprising the electrode and polymeric material and its use as electrode active material or as electrode binder

A formed, secondary electrochemical cell includes at least one positive electrode containing a metal compound capable of reversibly incorporating and releasing lithium in the form of ions, at least one negative electrode containing a carbon compound capable of reversibly incorporating or releasing lithium in the form of ions, and/or a metal and/or semi-metal which can be alloyed with lithium, an electrolyte via which lithium ions can migrate between the at least one positive electrode and the at least one negative electrode, and mobile lithium available for incorporation or releasing processes in the electrodes, wherein capacity of the at least one negative electrode for taking up lithium is higher than that of the at least one positive electrode, the at least one negative electrode has a higher capacity than required for taking up the entire mobile lithium contained in the cell, and the mobile lithium is contained in the cell in an amount which exceeds the capacity of the at least one positive electrode for taking up lithium.

A process of producing active material for an electrode of an electrochemical cell includes providing lithium-intercalating carbon particles having an average particle size of 1 &#x3bc;m to 100 &#x3bc;m as component 1, providing silicon particles having an average particle size of 5 nm to 500 nm as component 2, providing a polymer or polymer precursor which can be pyrolyzed to form amorphous carbon and is selected from the group consisting of epoxy resin, polyurethane resin and polyester resin, as component 3, mixing components 1 to 3 in to a mixture and heat treating the mixture substantially in the absence of atmospheric oxygen at a temperature at which the pyrolyzable polymer or the pyrolyzable polymer precursor decomposes to form amorphous carbon.

Structurally stable active material for battery electrodes

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Graz, Austria

Harald Kren