Compositions and methods of making compositions are provided for nitride- and/or oxide-modified electrode compositions. In certain embodiments, the nitride- and/or oxide-modified compositions have the general formula M.sub.1-zM'.sub.zO.sub.aF.sub.3-xN.sub.y. Such compositions may be used as bulk or surface compositions, and used in a battery as the anode or cathode. In other embodiments, the electrode includes a surface coating composition selected from metal nitrides and metal oxides, and a core composition having the formula M.sub.1-zM'.sub.zO.sub.aF.sub.3-x, or an oxide fluoride.
STATEMENT OF GOVERNMENT INTEREST
 The invention was made with government support under contract number DE-AC05-00OR22725 by the Department of Energy. The Government has certain rights in the invention.