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US 8,148,015 B2Granted
Cathode materials for lithium batteries
AssigneeBYD Company Limited
InventorsFuzhong Pan, Xi Shen, Caimin Wan, Shengping You
Life of this patent
Estimating the term…
Abstract
Described are cathode materials for lithium batteries. Better cathode materials may be produced by mixing at least two compounds and a binder additive. The first compound includes one or more salts of lithium metal phosphorous while the second compound includes one or more lithium transition metal oxides. In other instances, a conductive additive may also be incorporated. The cathode materials so produced exhibit enhanced electrical properties and thermal stability.
Claims8
A cathode material comprising:
- a first compound;
- a binder component;
- and
- a second compound;
- wherein the second compound comprises a lithium transition metal oxide having a general formula selected from the group consisting of:
- Li1+xMnyM2−yO4, wherein:
- −0.1≦X≦0.2, 1.7≦Y≦2.0 and M is selected from the group consisting of boron, magnesium, aluminum, titanium, chromium, iron, zirconium, copper, zinc, gallium, yttrium, fluorine, iodine, sulfur, cobalt, nickel, and combinations thereof;
- and
- Li1+xNi1−y−zMnyCozMpO2, wherein:
- −0.1≦X≦0.2, 0≦Y≦1, 0≦Z≦1, 0≦Y+Z≦1.0, 0<P≦0.2 and M is selected from the group consisting of boron, magnesium, aluminum, titanium, chromium, iron, zirconium, copper, zinc, gallium, yttrium, fluorine, iodine, sulfur, and combinations thereof;
- wherein the average particle size of the second compound is larger than the average particle size of the first compound;
- and
- wherein, the first compound is a lithium metal phosphate salt having the general formula Li1+xMyPO4, wherein:
- −0.1≦X≦0.2, 0.9≦Y≦1.1;
- and M is selected from the group consisting of:
- calcium, iron, aluminum, titanium, cobalt, boron, chromium, nickel, magnesium, zirconium, gallium, vanadium, manganese, zinc and combinations thereof, and the amount of the first compound ranges from about 51% to about 98% by weight of the total amount of the cathode material.
13 more elements
Dependencies are inferred from the claim text.