Three-dimensional (3D) porous electrode architecture for a microbattery

摘要

A three-dimensional porous electrode architecture for a microbattery includes a substrate having first and second conductive patterns disposed thereon where the first and second conductive patterns are electrically isolated from each other, a three-dimensional porous cathode disposed on the first conductive pattern, and a three-dimensional porous anode disposed on the second conductive pattern. The porous cathode includes a first conductive scaffold conformally coated with a layer of a cathode active material and having a porosity defined by a network of interconnected pores, where the first conductive scaffold has a lateral size and shape defined by the first conductive pattern and porous side walls oriented substantially perpendicular to the substrate. The porous anode includes a second conductive scaffold conformally coated with a layer of an anode active material and having a porosity defined by a network of interconnected pores.

主权项

1. A method of fabricating a three-dimensional porous electrode architecture for a microbattery, the method comprising:
providing a surface comprising a first conductive pattern and a second conductive pattern thereon, the first and second conductive patterns being electrically isolated from each other; forming a lattice structure on the surface; infiltrating interstices of the lattice structure with a first conductive material and a second conductive material, the first and second conductive materials propagating through the interstices in a direction away from the surface to reach a predetermined thickness, where the first conductive material spans an area of the surface overlaid by the first conductive pattern and the second conductive material spans an area of the surface overlaid by the second conductive pattern; removing the lattice structure to form a network of interconnected voids in each of the first and second conductive materials, thereby forming three-dimensional first and second conductive scaffolds, each conductive scaffold having the predetermined thickness and a lateral size and shape defined by the respective conductive pattern; conformally depositing an anode active material on the second conductive scaffold to form a porous anode; and after depositing the anode active material, conformally depositing a cathode active material on the first conductive scaffold to form a porous cathode, and lithiating the porous cathode, thereby forming a three-dimensional battery electrode architecture.