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US 10,483,538 B2Granted
Mixed oxide containing a lithium manganese spinel and process for its preparation
AssigneeJohnson Matthey Public Limited Company
InventorsChristian Vogler, Gerhard Nuspl, Margret Wohlfahrt-Mehrens, Peter Axmann, Gisela Arnold
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Abstract
The present invention relates to a mixed oxide containing a) a mixed-substituted lithium manganese spinel in which some of the manganese lattice sites are occupied by lithium ions and b) a boron-oxygen compound. Furthermore, the present invention relates to a process for its preparation and the use of the mixed oxide as electrode material for lithium ion batteries.
Claims25
A mixed oxide containing
- a) a mixed-substituted lithium manganese spinel as a first constituent in which a first portion of the manganese lattice sites are occupied by lithium ions and
- b) a boron-oxygen compound as a second constituent,
- wherein the mixed oxide is a single-phase homeotype mixed crystal comprising the constituents a) and b), wherein the second constituent is in the same phase as the first constituent, and
- wherein the mixed oxide has a composition satisfied by the following formula:
- [(Li1-aMa)(Mn2-c-dLicGd)Ox].(bB2O3.f*bLi2O)
- wherein:
- 0≤a<0.1;
- d<1.2;
- 3.5<x<4.5;
- 0.01<c<0.06;
- 0<b<0.05;
- 1<f<4;
- M is at least one element selected from the group of Zn, Mg and Cu;
- and
- G is at least one element selected from the group of Al, Mg, Zn, Co, Ni, Cu and Cr;
- and
- wherein in the mixed-substituted lithium manganese spinel an element of G occupying a second portion of the manganese lattice sites is Ni or Co, wherein when Ni is present, the contribution of Ni to “d” is 0.5+/−0.1 or when Co is present, the contribution of Co to “d” is 1+/−0.2, and
- the size of the primary crystallites of the mixed oxide, measured as D50, is at least 0.5 μm.
15 more elements
A process for the preparation of a mixed oxide containing a mixed-doped hyperstoichiometric lithium manganese spinel, wherein
- at least one lithium component, at least one manganese component, at least one boron component, at least one component containing G, wherein G is selected from the group of Al, Mg, Co, Ni, Cu and Cr, and optionally at least one component containing M, wherein M is selected from Zn, Mg and Cu is provided;
- a first portion of a solid mixture is prepared by mixing the manganese component and the lithium component optionally with one or more of the components other than the manganese, lithium and boron components in dry, powdery form;
- a second portion of a liquid mixture is prepared which contains the boron component in dissolved form and/or as a suspension, wherein the stoichiometric quantities of the components of the first and second portions are selected in such a way that the mixed oxide of the following formula results:
- [(Li1-aMa)(Mn2-c-dLicGd)Ox].(bB2O3.f*bLi2O)
- wherein:
- 0≤a<0.1;
- d<1.2;
- 3.5<x<4.5;
- 0.01<c<0.06;
- 0<b<0.05;
- 1<f<4;
- M is at least one element from the group of Zn, Mg and Cu;
- G is at least one element from the group of Al, Mg, Co, Ni, Cu and Cr;
- the first and second portions of the mixture are mixed;
- a solvent is drawn off from the mixture obtained;
- and
- the mixture is calcined at a temperature of 300° C. or more;
- wherein the size of the primary crystallites of the mixed oxide, measured as d50, is at least 0.5 μm.
15 more elements
Dependencies are inferred from the claim text.