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US 2010/0301267 A1Published application
Methods of making lithium vanadium oxide powders and uses of the powders
AssigneeConocoPhillips Company
InventorsZhenhua Mao, Mark W. Carel
Life of this patent
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Abstract
Methods relate to making lithium vanadium oxide powders. Applications for the lithium vanadium oxide powders include use as a negative electrode or anode material for lithium ion batteries. Liquid phase reactions and reduction in vanadium oxidation state of precursor material facilitate in the making of the lithium vanadium oxide powders. Particles forming the lithium vanadium oxide powders may further contain carbon to provide electrical conductivity.
Claims20
A method comprising the steps of:
- preparing a liquid mixture comprising a reducing agent, vanadium pentoxide (V2O5), and lithium ions from a lithium salt;
- and
- forming lithium vanadium oxide by subjecting the mixture to conditions that permit reduction of the vanadium pentoxide by the reducing agent for precipitation of lithium vanadium oxide particles, wherein the particles have a formula defined as Li1+XVO2, where x is a number from 0 to 0.5.
A method comprising the steps of:
- preparing a liquid mixture comprising a reducing agent, vanadium pentoxide (V2O5), and lithium ions from a lithium salt;
- forming lithium vanadium oxide by subjecting the mixture to conditions that permit the reducing agent to reduce the vanadium pentoxide, in absence of oxygen displacing anionic compounds, for precipitation of lithium vanadium oxide particles;
- and
- separating the particles from liquids of the mixture.
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A method comprising the steps of:
- preparing a liquid mixture comprising n-methyl-pyrrolidinone, vanadium pentoxide (V2O5), and lithium ions from at least one of lithium carbonate (Li2CO3) and lithium hydroxide (LiOH);
- forming lithium vanadium oxide by heating the mixture such that the n-methyl-pyrrolidinone reduces vanadium oxidation state from 5+ to a lower oxidation state for precipitation of lithium vanadium oxide particles, wherein during the heating a molar ratio of lithium to vanadium within the mixture is from 1.5 to 1 and the particles have a formula of Li1+xVO2, where x is a number from 0 to 0.5;
- and
- incorporating the particles into an anode of a battery.
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Dependencies are inferred from the claim text.