Patent ID: 7718319

Claim:
A method of making an oxyfluoride composition comprising the steps of: firing a solid state mixture comprising lithium, manganese, and M to obtain a first composition having the formula LiMn 2−y−z Li y M z O 4 ; mixing the first composition with a fluorine source to form a second mixture; and heating the second mixture at a temperature within the range of about 200° C. to about 700° C. for 2 hours to 8 hours to form a cation-substituted, fluorine-substituted LiMn 2−y−z Li y M z O 4−η F η spinel oxide structure, wherein M is a metal, y is within the range of about 0 to about 0.3, z is within the range of about 0 to about 1.0, and wherein η is greater than 0 and less than about 0.5, and wherein the fluorine source is a solid or liquid selected from the group consisting of NH 4 HF 2 , ammonium fluoride, or hydrogen fluoride.