Stabilized lithium, manganese ab2o4 spinel for rechargeable lithium electrochemical systems through a and b site doping, method of preparing the same, and li electrochemical cell containing the same
AssigneeUnited States Government as represented by the Secretary of the Army
InventorsTerrill B. Atwater, Yakira J. Howarth
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Abstract
A process for preparing a stable LixKyMn2-zMezO4 is provided. The general formula of the potassium “A” site and Group VIII Period 4 (Fe, Co and Ni) “B” site modified lithium manganese-based AB2O4 spinel is LixKyMn2-zMezO4 where Me is Fe, Co, or Ni. In addition, a LixKyMn2-zMezO4 cathode material for electrochemical systems is provided. Furthermore, a lithium or lithium-ion rechargeable electrochemical cell is provided, incorporating the LixKyMn2-zMezO4 cathode material in a positive electrode.
Claims20
A method of preparing a homogeneously dispersed potassium-modified lithium manganese-based LixKyMn2-zMezO4 spinel cathode material, the method comprising:
- mixing a manganese source and a Group VIII Period 4 source to form a first mixture;
- calcining the first mixture to produce a manganese mixed metal-based metal oxide;
- mixing the manganese mixed metal-based metal oxide, a lithium source, and a potassium source to produce a second mixture;
- and
- calcining the second mixture to produce the homogeneously dispersed potassium-modified lithium manganese-based LixKyMn2-zMezO4 spinel cathode material,
- wherein Me is selected from a group consisting of iron, cobalt, and nickel.
A homogeneously dispersed, potassium-modified lithium manganese-based LixKyMn2-zMezO4 spinel cathode material, prepared by a process comprising:
- mixing a manganese source and a Group VIII Period 4 source to form a first mixture;
- calcining the first mixture to produce a manganese mixed metal-based metal oxide;
- mixing the manganese mixed metal-based metal oxide, a lithium source, and a potassium source to produce a second mixture;
- and
- calcining the second mixture to produce the homogeneously dispersed potassium-modified lithium manganese-based LixKyMn2-zMezO4 spinel cathode material,
- wherein Me is selected from a group consisting of iron, cobalt, and nickel.
A lithium electrochemical cell comprising:
- an anode;
- and
- a cathode comprising a homogeneously dispersed potassium-modified lithium manganese-based LixKyMn2-zMezO4 spinel cathode material prepared by a process comprising:
- mixing a manganese source and a Group VIII Period 4 source to form a first mixture;
- calcining the first mixture to produce a manganese mixed metal-based metal oxide;
- mixing the manganese mixed metal-based metal oxide, a lithium source, and a potassium source to produce a second mixture;
- and
- calcining the second mixture to produce the homogeneously dispersed potassium-modified lithium manganese-based LixKyMn2-zMezO4 spinel cathode material,
- wherein Me is selected from a group consisting of iron, cobalt, and nickel.
Dependencies are inferred from the claim text.