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US 2014/0272555 A1Published application
Cathode material and battery
AssigneeE. I. Du Pont de Nemours and Company
InventorsMARK GERRIT ROELOFS, Jun J. Liu
Life of this patent
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Abstract
A lithium ion battery cathode material, and an electrode prepared from such material, is described. The cathode material has a layered-spinel composite structure. The lithium ion battery operates at a high voltage (i.e. up to about 5 V) and has a desirably high cycling performance and rate capability.
Claims17
A composite material represented by the structure of Formula IV:
- x(Li2−wA1−vQw+vO3−e)·(1−x)(LiMn2−zNnzO4−d) IV
- wherein:
- x is about 0.005 to about 0.1;
- A comprises one or more of Mn or Ti;
- Q comprises one or more of Al, Ca, Co, Cr, Cu, Fe, Ga, Mg, Nb, Ni, Ti, V, Zn, Zr or Y;
- e is 0 to about 0.3;
- v is 0 to about 0.5.
- w is 0 to about 0.6;
- M comprises one or more of Al, Ca, Co, Cr, Cu, Fe, Ga, Li, Mg, Mn, Nb, Ni, Si, Ti, V, Zn, Zr or Y;
- d is 0 to about 0.5;
- y is about 0 to about 1;
- and
- z is about 0.3 to about 1;
- and
- wherein the LiyMn2−zMzO4−d component has a spinel structure and the Li2−wQw+vA1−vO3−e component has a layered structure.
12 more elements
A method for preparing a cathode active composition of the formula x(Li2−wA1−vQw+vO3−e).(1−x)(LiyMn2−zMzO4−d) (Formula IV),
- wherein the method comprises the steps of:
- (a) combining
- (i) the salts and/or oxides of the metals Li, Mn, A and Q with
- (ii) a flux agent having a melting temperature in the range of from about 600° C. to about 1000° C.,
- to form a mixture of same;
- (b) heating the mixture of step (a) to a temperature of at least the melting temperature of the flux agent, to obtain a molten flux composition comprising the salts and/or oxides of the metals Li, Mn, A and Q;
- and
- (c) cooling the molten flux composition of step (b) at a cooling rate of less than or equal to about 1° C./minute for at least until such time that said molten flux composition solidifies to form a solid composition,
- wherein:
- (1) x is between 0 and 1;
- (2) A comprises one or both members of the group consisting of Mn and Ti;
- (3) Q comprises one or more members of the group consisting of Al, Ca, Co, Cr, Cu, Fe, Ga, Mg, Nb, Ni, Ti, V, Zn, Zr and Y;
- (4) e is 0 to about 0.3;
- (5) v is 0 to about 0.5.
- (6) w is 0 to about 0.6;
- (7) M comprises one or more members of the group consisting of Al, Ca, Co, Cr, Cu, Fe, Ga, Li, Mg, Mn, Nb, Ni, Si, Ti, V, Zn, Zr and Y;
- (8) d is 0 to about 0.5;
- (9) y is 0 to about 1;
- and
- (10) z is about 0.3 to about 1;
- and
- wherein the LiyMn2−zMzO4−d component has a spinel structure and the Li2−wQw+vA1−vO3−e component has a layered structure.
19 more elements
Dependencies are inferred from the claim text.