Abstract: 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 ?2, Y represents an amide group (—NH—CO— or —CO—NH—), an ester group (—O—CO— or —CO—O—) or a urethane group (—NH—CO—O— or —O—CO—NH—), R1, R2, R3 and R4 each independently represent H, alkyl (preferably —CH3, —C2H5), Alkoxy-(preferably —OCH3, —OC2H5), -halogen or —CN, Ar1 and Ar4 independently represent a bridging aryl group, Ar2 and Ar3 independently represent a non-bridging aryl group, and R5 is a bridging alkyl, alkene or aryl group, wherein Ar1 and Ar4 in structures (I) and (II) independently represent a bridging aryl group.
Type:
Grant
Filed:
November 23, 2015
Date of Patent:
August 20, 2019
Assignees:
VARTA Micro Innovation GmbH, Technische Universität Graz, Polymer Competence Center Leoben GmbH
Inventors:
Martin Schmuck, Harald Kren, David E. Fast, Robert Saf, Franz Stelzer, Katharina Gallas
Abstract: 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 ?m to 100 ?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.
Type:
Grant
Filed:
September 19, 2012
Date of Patent:
August 30, 2016
Assignee:
Varta Micro Innovation GmbH
Inventors:
Michaela Scharfegger, Harald Kren, Stefan Koller
Abstract: A method of producing electrodes for lithium ion batteries including forming the electrodes formed by electro-chemical deposition, from a mixture including particles made of at least one electrochemically active material, a binder and a solvent and/or dispersing agent.
Abstract: 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 incurporating 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
Type:
Application
Filed:
November 11, 2011
Publication date:
October 3, 2013
Applicant:
VARTA MICRO INNOVATION GMBH
Inventors:
Harald Kren, Stefan Koller, Andrea Droisner
Abstract: A paste for producing electrodes for lithium ion batteries includes as electrochemically active material particles of at least one of a metal/semimetal selected from the group consisting of silicon, aluminium, antimony, tin, cobalt and carbon-based particles which intercalate lithium, a binder based on a polysaccharide, water as a solvent, and an aliphatic polyester having a molar mass of 150 to 500 g/mol or an hydroxycarboxylic ester having a molar mass of 150 to 500 g/mol as a plasticizer.
Type:
Application
Filed:
August 12, 2011
Publication date:
August 15, 2013
Applicant:
VARTA Micro Innovation GmbH
Inventors:
Harald Kren, Andrea Droisner, Stefan Koller