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US 2012/0068129 A1Published application
Optimised positive electrode material for lithium cell batteries, method for the production thereof, electrode, and battery for implementing said method
AssigneeCommissariat a l'Energie Atomique
InventorsSéverine JOUANNEAU, Frédéric LE CRAS, Carole BOURBON, Hélène LIGNIER
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Abstract
A material or compound is provided having a spinel structure and corresponding to the formula LiyNi0.5Mn1.5−xIVMnxIIIAzO4−d, where: 0.02≦x≦0.35; d>0; A is selected from the group comprising Na, K, Mg, Nb, Al, Ni, Co, Zr, Cr, Fe, Cu, Ti, Zn, Si and Mo; 0.8≦y≦1.2; 0≦z≦0.1; and has a mesh parameter of between 8.174 and 8.179 Å.
Claims13
A method for preparing a compound having a spinel structure, said compound having a mesh parameter of between 8.174 and 8.179 Å, and said compound having the formula LiyNi0.5Mn1.5−xIVMnxIIIAzO4−d, wherein:
- 0.02≦x≦0.35;
- d>0;
- A is selected from the group consisting of Na, K, Mg, Nb, Al, Ni, Co, Zr, Cr, Fe, Cu, Ti, Zn, Si and Mo;
- 0.8≦y≦1.2;
- and
- 0≦z≦0.1;
- wherein said method comprises:
- forming a mixture by mixing lithium, nickel and manganese based precursor in stoichiometric conditions with a lithium excess of 1 to 5 mol%;
- subjecting the mixture to a first heat treatment at a first temperature of between 550 and 600° C.;
- and
- after the first heat treatment, subjecting the mixture to a second heat treatment at a second temperature above 700° C. combined with a cooling in oxygen containing medium.
8 more elements
Dependencies are inferred from the claim text.