Cation-Substituted Spinel Oxide and Oxyfluoride Cathodes for Lithium Ion Batteries
AssigneeBoard of Regents, The University of Texas System
InventorsArumugam Manthiram, Wonchang Choi
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Abstract
The present invention includes compositions and methods of making cation-substituted and fluorine-substituted spinel cathode compositions by firing a LiMn2-y-zLiyMzO4 oxide with NH4HF2 at low temperatures of between about 300 and 700° C. for 2 to 8 hours and a η 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.
Claims25
A method of making an oxyfluoride composition comprising the step of:
- heating a composition having the formula LiMn2−y−zLiyMzO4 in the presence of a fluoride source at a temperature within the range of about 200 to about 700° C. for 2 to 8 hours to form a cation-substituted, fluorine-substituted LiMn2−y−zLiyMzO4−ηFη spinel oxide structure, wherein y is within the range of about 0 to about 0.3, wherein z is within the range of about 0 to about 1.0, and wherein η is greater than 0 and less than about 0.50.
A composition comprising a cation-substituted, fluorine-substituted LiMn2−y−zLiyMzO4−ηFη spinel oxide structure with fluorine incorporated into the spinel lattice, wherein η is greater than 0 and is less than about 0.50.
A method of making a cathode comprising the steps of:
- mixing a LiMn2−y−zLiyMzO4−ηFη composition with a conductive diluent and a binder to form a cation-substituted, fluorine-substituted LiMn2−y−zLiyMzO4−ηFη composition;
- and
- forming the cation-substituted, fluorine-substituted LiMn2−y−zLiyMzO4−ηFη composition into a cathode.
A cathode, comprising:
- a LiMn2−y−zLiyMzO4−ηFη cation-substituted spinel oxide material, wherein y comprises between about 0 and 0.3, z comprises between about 0 and 1.0 and η comprises greater than 0 and less than about 0.5 in contact with a layered oxide material comprising Li[Ni,Mn,Co,Li]O2 or a combination thereof.
A method of making a spinel and layered oxide cathode, comprising:
- forming a cathode from a mixture of a cation-substituted spinel oxide material and a layered oxide material.
Dependencies are inferred from the claim text.