SI/C COMPOSITE ANODES FOR LITHIUM-ION BATTERIES WITH A SUSTAINED HIGH CAPACITY PER UNIT AREA
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United States of America Patent
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Issued Date -
Sep 17, 2015
app pub date -
Feb 3, 2015
filing date -
Mar 12, 2014
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Abstract
A method for producing a silicon carbon composite electroactive anode material (AM) capable to alloy is described. This method comprises (i) mixing micro sized silicon powder with micro sized polymer powder to produce a silicon-polymer-mixture, (ii) heating the silicon-polymer mixture in inert gas to pyrolysis temperature and keeping it there for a time sufficiently long to pyrolyze the polymer and to form a pyrolyzed polymer coated silicon, and (iii) milling said pyrolyzed polymer coated silicon in inert gas to form the silicon carbon composite electroactive anode material (AM). Such AM is suitably formed into electrodes by mixing it with e.g. polymer binder, electrically conductive additives and solvent, coating therewith a current collector and drying the coating. Such anodes are especially suitable for Li-ion electrodes.
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