6O13), a material of the form LiMPO4 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, LiMPO4x where M is a metal such as iron or vanadium and X is a halogen such as fluorine, and combinations thereof.