US Patent 7842535 - Silicon nanopillar lithium battery

http://www.freepatentsonline.com/7842535.html

This patent to Nexeon Ltd. appears to be fundamental to nanostructured silicon anodes used in lithium batteries. Claim 1 reads:

1. A method of fabricating an energy storage device comprising the steps of:

forming an anode comprising an array of sub-micron silicon structures supported on a silicon substrate;

forming a cathode comprising lithium; and

arranging the anode and cathode in communication to form a battery.