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Dec

2008

Defense Tech Briefs - Silicon Nanowires for Anodes of Rechargeable Li Power Cells

Battery technologies are improving every day!

Charge capacities could be increased substantially over those of carbon-based anodes.

Silicon nanowires have been investigated as alternatives to the graphite heretofore widely used as an anode material in rechargeable lithium-ion power cells. The theoretical specific charge capacity of graphite, corresponding to the maximum Li content (at a composition of LiC6) is 372 mA•hr/g. In contrast, the theoretical specific charge capacity of Si corresponding to the maximum Li content (at a composition of Li4.4Si) is much greater — 4.2 A•hr/g.