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US 8,709,279 B2Granted
Production of battery grade materials via an oxalate method
AssigneeUchicago Argonne, LLC
InventorsIlias Belharouak, Khalil Amine
Life of this patent
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Abstract
An active electrode material for electrochemical devices such as lithium ion batteries includes a lithium transition metal oxide which is free of sodium and sulfur contaminants. The lithium transition metal oxide is prepared by calcining a mixture of a lithium precursor and a transition metal oxalate. Electrochemical devices use such active electrodes.
Claims17
A method of preparing a lithium transition metal oxide comprising:
- preparing a first solution comprising transition metal ions;
- preparing a second solution comprising oxalic acid and a precipitating agent;
- adding the first solution to the second solution to form a combined solution and a precipitate of a transition metal oxalate;
- and
- calcining a mixture of a lithium precursor and the transition metal oxalate to form the lithium transition metal oxide;
- wherein:
- the precipitating agent comprises ammonium hydrogen oxalate, di-ammonium oxalate, lithium oxalate, sodium oxalate, potassium oxalate, or a mixture thereof;
- and
- the transition metal oxalate comprises a compound of formula
- [M1α′M2β′M3γ′]C2O4;
- M1, M2, and M3 are transition metals;
- and
- 0<α′≦1;
- 0<β′≦1;
- and 0<γ′≦1.
12 more elements
A method of preparing a lithium transition metal oxide comprising:
- preparing a first solution comprising transition metal ions;
- preparing second solution comprising oxalic acid and a precipitating agent;
- adding the first solution to the second solution to form a combined solution and a precipitate of a transition metal oxalate;
- and
- calcining a mixture of a lithium precursor and the transition metal oxalate;
- wherein:
- the precipitating agent comprises ammonium hydrogen oxalate, di-ammonium oxalate, lithium oxalate, sodium oxalate, potassium oxalate, or mixture thereof;
- the lithium transition metal oxide comprises a compound of formula
- Lix[M1αM2βM3γ]Oz;
- M1, M2, and M3 are transition metals;
- and
- 1<x≦2;
- 0<α≦0.33;
- 0≦β≦0.5;
- 0<γ≦0.8;
- and 2<z≦3;
- and the sum of α, β, and γ is 1;
- and
- the transition metal oxalate comprises a compound of formula
- [M1α′M2β′M3γ′]C2O4;
- and
- 0<α′≦0.33;
- 0≦β′≦0.5;
- and 0<γ′≦0.8;
- and the sum of α′, β′, and γ′ is 1.
22 more elements
A method of preparing a lithium transition metal oxide comprising:
- preparing a first solution comprising transition metal ions;
- preparing a second solution comprising oxalic acid and a precipitating agent;
- adding the first solution to the second solution to form a combined solution and a precipitate of a transition metal oxalate;
- and
- calcining a mixture of a lithium precursor and the transition metal oxalate;
- wherein:
- the precipitating agent comprises ammonium hydrogen oxalate, di-ammonium oxalate, lithium oxalate, sodium oxalate, potassium oxalate, or mixture thereof;
- the lithium transition metal oxide comprises a compound of formula
- Lix[M1αM2βM3γ]Oz;
- M1, M2, and M3 are transition metals;
- and
- 1<x≦2;
- 0<α≦0.33;
- 0≦β;
- 0<γ≦0.8;
- and 2<z≦3;
- and the sum of α and γ is 1;
- and
- the transition metal oxalate comprises a compound of formula
- [M1α′M2β′M3γ′]C2O4;
- and
- 0<α′≦0.33;
- 0≦β′;
- and 0<γ′≦0.8;
- and the sum of α′ and γ′ is 1.
22 more elements
Dependencies are inferred from the claim text.