NOVELTY - The battery system has a negative electrode (102), a layer of porous separator (106) adjacent to the negative electrode and a positive electrode (104) adjacent to the separator layer in an electrochemical cell (100). The positive electrode includes a gas phase such as oxygen gas phase and an electrically conductive framework (110) defining at least one wetting channel (112), and the wetting channel distributes electrolyte solution (114) within the electrically conductive framework.    USE - Battery system e.g. lithium-oxygen battery for portable electronics and electric and hybrid-electric vehicles.    ADVANTAGE - Amount and distribution of non-aqueous electrolyte and oxygen gas in the cathode is carefully controlled such that transport limitations are minimized and enable electrochemical cell to provide increased power density, increased energy density and higher round-trip energy efficiency at given power or current density and exhibits increased ability to provide electrolyte throughout the electrode even as lithium oxygen is deposited on the electrically conductive framework. Gas phase of the oxygen occupies about 65 percent by volume of the positive electrode to provide uniform wetting of the electrolyte solution throughout the positive electrode and uniform distribution of gas volume fraction within the positive electrode. Provide battery system with electrochemical cell that optimizes volume fractions and distribution of components by engineering the wetting of the electrolyte on the surfaces of the electrically conductive framework and ensures good access of the oxygen gas phase throughout the cathode by ensuring the pore structure and product structure that includes gas channels or an otherwise open structure.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for forming battery system.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of lithium-oxygen cell with two electrodes, one of which is used to control the distribution of oxygen and electrolyte within the electrode, in fully charged state.    Electrochemical cell (100)    Negative electrode (102)    Positive electrode (104)    Porous separator (106)    Electrically conductive framework (110)    Wetting channel (112)    Electrolyte solution (114)