Lithium battery electrode compositions
OwnerRene Koksbanginventor
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Abstract
A process of making lithium battery electrode active material having fine particles of vanadium oxide (V.sub.x O.sub.y) or lithium-vanadium oxide (Li.sub.z V.sub.x O.sub.y) intimately mixed with fine particles of carbon. The process includes forming a wet solution of a vanadium oxide precursor and carbon, and then decomposing the precursor/carbon mixture at an elevated temperature or by atomization in a controlled atmosphere. Alternatively, fine particles of vanadium oxide are formed from precursor halogen compounds by atomization in oxygen.
Claims22
A method of preparing a composition for an electrode comprising forming a wet mixture consisting essentially of ammonium metavanadate (NH.sub.4 VO.sub.3) and fine particles of carbon dispersed in a solvent, removing at least a portion of the solvent and decomposing the ammonium metavanadate in an oxygen-containing environment at a temperature sufficient to form particles of an oxide of vanadium represented by the nominal general formula V.sub.2 O.sub.5 intermingled with and in grain-to-grain contact with the fine carbon particles.
A method of preparing a composition for an electrode, comprising:
- a) forming a mixture comprising a vanadium oxide halogen compound and fine particles of carbon dispersed in the mixture;
- and
- b) decomposing the vanadium oxide halogen compound to form particles of one or more oxides of vanadium, and intermingling the particles of the one or more oxides of vanadium with the fine carbon particles in grain-to-grain contact therewith.
A method of preparing a composition for an electrode, comprising:
- a) forming a mixture consisting essentially of ammonium metavanadate (NH.sub.4 VO.sub.3) and fine particles of carbon dispersed in a solvent;
- b) drying the mixture at a first temperature while maintaining dispersion of the carbon particles;
- and
- c) heating the product of step (b) for a time and at a second temperature greater than the first temperature and sufficient to decompose the ammonium metavanadate in an oxygen-containing environment to form particles of one or more oxides of vanadium and insufficient to ignite the fine particles of carbon, and intermingling the particles of the one or more oxides of vanadium with the fine carbon particles in grain-to-grain contact therewith.
Dependencies are inferred from the claim text.