An electrochemical cell that cycles lithium ions includes a positive electrode, a negative electrode current collector spaced apart from the positive electrode, and an ionically conductive electrolyte disposed between the positive electrode and the negative electrode current collector. The negative electrode current collector is of unitary one-piece construction and has a three-dimensional porous structure that defines an interconnected network of open pores. During charging of the electrochemical cell, lithium metal is deposited within the open pores of the negative electrode current collector.