Patent Number: 8,722,246

Title: Cation-substituted spinel oxide and oxyfluoride cathodes for lithium ion batteries

Abstract: The present invention includes compositions and methods of making cation-substituted and fluorine-substituted spinel cathode compositions by firing a LiMn.sub.2-y-zLi.sub.yM.sub.zO.sub.4 oxide with NH.sub.4HF.sub.2 at low temperatures of between about 300 and C. for 2 to 8 hours and a .eta. of more than 0 and less than about 0.50, mixed two-phase compositions consisting of a spinel cathode and a layered oxide cathode, and coupling them with unmodified or surface modified graphite anodes in lithium ion cells.

Inventors: Manthiram; Arumugam (Austin, TX), Choi; Wonchang (Austin, TX)

Assignee: Board of Regents of the University of Texas System

International Classification: H01M 4/52 (20100101); H01B 1/08 (20060101)

Expiration Date: 5/13/12018