Method of making lithium battery electrode compositions
AssigneeValence Technology, Inc.
InventorRene Koksbang
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Abstract
Fine particles of vanadium oxide or lithiated vanadium oxide are less than 100 microns in size and on the order of 30 microns in size. Such fine particles are prepared by spray-drying a precursor mixture. Such oxide particles are also intermingled with fine particles of carbon by including carbon particles in the precursor mixture.
Claims20
A method of preparing a vanadium oxide based active material composition for an electrode of an electrochemical cell, by the steps consisting essentially of:
- a. forming a wet mixture comprising at least one volatile constituent and an oxide of vanadium represented by the general formula V.sub.2 O.sub.5 ;
- b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the oxide of vanadium at least a major portion of such particles represented by the general formula V.sub.2 O.sub.5 ;
- c. directing the fine particles onto a collection surface;
- and
- d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
A method of preparing vanadium oxide based active material composition for an electrode of an electrochemical cell, comprising:
- a. forming a wet mixture comprising at least one volatile constituent, lithium hydroxide (LiOH) and an oxide of vanadium represented by the general formula V.sub.2 O.sub.5 and reacting the LiOH with the V.sub.2 O.sub.5 for a time and at a temperature to provide lithium-vanadium oxide of the nominal general formula LiV.sub.3 O.sub.8 ;
- b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the lithium-vanadium oxide having the nominal general formula LiV.sub.3 O.sub.8 ;
- c. directing the fine particles onto a collection surface;
- and
- d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
A method of preparing a vanadium oxide based active material composition for an electrode of an electrochemical cell, comprising:
- a. forming a wet mixture comprising at least one volatile constituent and an oxide of vanadium represented by the general formula V.sub.2 O.sub.5 ;
- b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the oxide of vanadium at least a major portion of such particles represented by the general formula V.sub.2 O.sub.5 ;
- c. directing the fine particles onto a collection surface at a temperature in a range selected to maintain the chemical and physical characteristics of the particles of step (b);
- and
- d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Dependencies are inferred from the claim text.