O4 where M is a metal or LiMx???M???1???xPO4 where M??? and M??? are different metals (e.g., LiFePO4, LiFexM1???xPO4 where M is a metal, LiVOPO4, and Li3V2(PO4)3, and LiMPO4x where M is a metal such as iron or vanadium and X is a halogen such as fluorine, and combinations thereof.