SI/C COMPOSITE ANODES FOR LITHIUM-ION BATTERIES WITH A SUSTAINED HIGH CAPACITY PER UNIT AREA

摘要

Described is a method for producing a silicon carbon composite electroactive anode material (AM) capable to alloy. This method comprises the steps of: (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 the silicon-polymer-mixture for a time sufficiently long to pyrolyze an organic polymer and to form a pyrolyzed polymer coated silicon; and (iii) milling the pyrolyzed polymer coated silicon in inert gas to form the silicon carbon composite electroactive anode material (AM). For example, such AM is suitably formed into electrodes by mixing the AM with 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.