Alternative OTEC Scheme for a Submarine Robot

An alternative system for exploiting the ocean thermal gradient to generate power would be based on the thawing-expansion/freezing-contraction behavior of a wax, or perhaps another suitable phase-change material. The power generated by this system would be used to recharge the batteries in a battery-powered unmanned underwater vehicle.

Posted in: Briefs, GDM, Briefs, Batteries, Electronics & Computers, Energy, Geothermal Power, Renewable Energy, Alternative Fuels, Green Design & Manufacturing


Oxide Fiber Cathode Materials for Rechargeable Lithium Cells

Fibers have been investigated at Johnson Space Center as alternatives to other powders used as lithium-intercalation compounds in cathodes of rechargeable lithium-ion electrochemical cells. The fibers can be pressed and sintered to form a cathode, without need for a binder or a conductive additive. The inter-grain contacts of the fibers are stronger and offer reduced loss of capacity from cycle to cycle.

Posted in: Briefs, GDM, Briefs, Batteries, Electronics & Computers


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