A Li-Ion Microbattery with 3D Electrodes of Different Geometries

Abstract

A Li-ion microbattery comprising three-dimensional (3D) electrodes of different geometries is reported. While aluminum nanorods are used as the negative electrode a 3D carbon matrix with a larger surface area is used as support for the LiFePO4 positive electrode to compensate for the difference in the specific energy densities between LiFePO4 and Al. No difference in cycling behavior was observed for cells containing delithiated (Al) or partially lithiated (LixAl) nanorods as the negative electrode. The present electrode geometry concept is particularly promising for the design of Li-ion microbatteries in which 3D electrode materials with different specific energy densities are employed.