NOVELTY - Electroactive composition (I) comprises a crystalline material having a metaloxy fluoride complex (A).    USE - (I) is useful in a battery, preferably secondary lithium ion battery (all claimed). The lithium ion battery is useful in mobile communication devices, such as phones, mobile entertainment devices, such as televisions, portable computers, and transportation devices, such as automobiles and fork lifts.    ADVANTAGE - (I) has high specific capacity and excellent cycling properties. (I) is stable over a significant number of charge-discharge cycles, and the materials provide good performance at higher discharge rates. The lithium ion batteries achieve long term cycling stability. (I) has a low risk of fire for improved safety properties due to their specific compositions with a layered structure and reduced amounts of nickel. (I) has low amounts of elements that are less desirable from an environmental perspective, and can be produced from starting materials hence cost-effective for commercial scale production. The positive electrode material used in the batteries has a high tap density, hence more chargeable material in the positive electrode yielding a higher total capacity of the battery.    DETAILED DESCRIPTION - Electroactive composition (I) comprises a crystalline material having a metaloxy fluoride complex of formula (Li1+xNi alpha Mn beta Co gamma A delta O2-zFz) (A).    x = 0.02-0.19;    alpha = 0.1-0.4;    beta = 0.35-0.869;    gamma = 0.01-0.2;    delta = 0.0-0.1;    z = 0.01-0.2; and    A = Mg, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y and/or Nb.    INDEPENDENT CLAIMS are included for:    (1) a battery (100) comprising a positive electrode (104) comprising (I), a negative electrode (102) comprising a lithium intercalation/alloy material and an electrolyte comprising lithium cations;    (2) synthesizing an oxyfluoride composition, comprising heating a fluorine source in contact with a metal oxide of formula (Li1+xNi alpha Mn beta Co gamma A gamma O2) (B) at 150-700 degrees C for at least 10 minutes to form the oxyfluoride composition;    (3) a metal oxyfluoride composition synthesized by method; and    (4) a secondary lithium ion battery comprising a positive electrode, a negative electrode comprising a lithium intercalation/alloy composition, a separator between the positive electrode and the negative electrode and a non-aqueous electrolyte comprising lithium ions, where the positive electrode comprises (B), and the positive electrode exhibits a specific capacity of at least 180 mAh/g when discharged from 4.6-2.0 volts at room temperature at 10th cycle at a rate of 1C and 20th at a rate of 5C.    In formula (B),    x = 0.02-0.25;    alpha = 0.10.4;    beta = 0.35-0.869;    gamma = 0.01-0.3; and    delta = 0-0.1; and    A = Mg, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y and/or Nb.    DESCRIPTION OF DRAWING(S) - The figure shows battery structure separated from a container.    Battery (100)    Negative electrode (102)    Positive electrode (104)    Separator between negative and positive electrode (106)    Current collector. (108)