Positive electrode for a lithium battery
AssigneeUchicago Argonne, LLC
InventorsSang-Ho Park, Khalil Amine
Life of this patent
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Abstract
A method for producing a lithium alkali transition metal oxide for use as a positive electrode material for lithium secondary batteries by a precipitation method. The positive electrode material is a lithium alkali transition metal composite oxide and is prepared by mixing a solid state mixed with alkali and transition metal carbonate and a lithium source. The mixture is thermally treated to obtain a small amount of alkali metal residual in the lithium transition metal composite oxide cathode material.
Claims18
A positive electrode of a general formula
- xLiAa′NiαCoβMnγMoδMyO2.(1−x)Li2MnγM″ψO3;
- wherein
- the LiAa′NiαCoβMnγMoδMyO2 and Li2Mn65M″βO3 components form a layered structure;
- A is Na, K, or a mixture of Na and K;
- M is Mg, Zn, Al, Ga, B, Zr, Si, Ti, Nb, W, or a mixture of any two or more thereof;
- X is F, S, Cl, I, or a mixture of any two or more thereof;
- x ranges from 0 to 1;
- a′ ranges from 0.01 to about 0.1;
- α ranges from 0.01 to 1;
- β ranges from 0 to 1;
- ψ ranges from 0 to 1;
- γ ranges from 0.01 to 1;
- δ ranges from 0 to 0.2;
- y ranges from 0 to 0.15;
- and
- z ranges from 0 to about 0.33.
A process for producing a transition metal carbonate comprising:
- precipitating a precipitate of oxide powders from a solution comprising:
- a Na2CO3, NaHCO3, NaOH, or a mixture of any two or more thereof;
- a compound of Formula II;
- and
- a mixed lithium source;
- and
- calcining the precipate of oxide powders to obtain a compound of Formula I;
- wherein:
- the compound of Formula I is Li1+x′NaNiαCoβMnγMoδMyO2-zXz;
- the compound of Formula II is Naa′NiαCoβMnγMκO2;
- M is Ca, Mg, Zn, Al, Ga, B, Zr, Si, Ti, Nb, or W;
- X is F, S, Cl, or I;
- x′ ranges from 0 to about 0.33;
- a′ ranges from 0 to about 0.1;
- α, β, and γ independently range from 0 to 1;
- δ ranges from 0 to 0.2;
- κ ranges from 0.01 to 0.15;
- y ranges from 0 to 0.15;
- and
- z ranges from 0 to about 0.33.
A process for producing a transition metal carbonate comprising:
- precipitating a precipitate of oxide powders from a solution comprising:
- A2CO3, AHCO3, AOH, or a mixture of any two or more thereof;
- a compound of Formula II;
- and
- a mixed lithium source;
- and
- calcining the precipate of oxide powders to obtain a compound of Formula III;
- wherein
- the compound of Formula III is Li1+x′Aa′NiαCoβMnγMoδMyO2-zXz;
- the compound of Formula II is Aa′NiαCoβMnγMκO2;
- A is Na, K, or a mixture of Na and K;
- M is Ca, Mg, Zn, Al, Ga, B, Zr, Si, Ti, Nb, W, or a mixture of any two or more thereof;
- X is F, S, Cl, I, or a mixture of any two or more thereof;
- x′ ranges from 0 to about 0.33;
- a′ ranges from 0 to about 0.1;
- α, β, and γ independently range from 0 to 1;
- δ ranges from 0 to 0.2;
- κ ranges from 0.01 to 0.15;
- y ranges from 0 to 0.15;
- and
- z ranges from 0 to about 0.33.
Dependencies are inferred from the claim text.