Researchers at Arizona State University have developed a technology that overcomes these challenges. The present invention relates to alloy cage structures of silicon, germanium and/or tin for use as an anode (negative electrode) and/or cathode (positive electrode) in rechargeable batteries. The theoretical charge storage capacity for silicon is about 4000 mAh/g, more than an order of magnitude higher than for graphite, the existing Li-ion battery anode. However, the structural changes that occur during this process results in the 300% change in volume between the unlithiated and lithiated phases. The use of nanostructuring has been applied in order to allow the silicon to undergo this volume change without fracturing or pulverizing. Such compositions may therefore provide electrode materials with improvement in capacity, energy density and stability over battery materials currently employed.
Potential ApplicationsLithium Ion Batteries Hybrid Electric Vehicles Electric Vehicles Portable Electric Devices Renewable Energy Storage
Benefits and AdvantagesImproved battery capacity Higher energy density Stabile battery composition