Battery structure with an anode structure containing a porous region and method of operation

A battery comprising:

• a lithium-containing cathode material layer;
• an anode structure of unitary construction and including a non-porous region and a porous region comprising a top porous layer having a first thickness and a first porosity, and a bottom porous layer located beneath the top porous layer and forming an interface with the non-porous region, wherein at least an upper portion of the non-porous region and an entirety of the porous region are composed of silicon, and wherein the bottom porous layer has a second thickness that is greater than the first thickness, and a second porosity that is greater than the first porosity;
• an electrolyte region located between the top porous layer of the anode structure and the lithium-containing cathode material layer, wherein the electrolyte region is composed entirely of a solid-state electrolyte;
• and
• a seed layer located on a surface of the top porous layer of the anode structure, wherein the seed layer is a planar, conformal lithium-containing material.