Nickel--containing compounds useful as electrodes and method for preparing same
AssigneeMinnesota Mining and Manufacturing Company
InventorsJeffrey R. Dahn, Tao Zheng
Life of this patent
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Abstract
A compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0. The invention also features an electrode composition containing this compound and processes for preparing a compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0.
Claims27
A compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0.
A process for preparing a compound comprising the steps of:
- (a) preparing a solution comprising (i) a chromium source, (ii) a nickel source, (iii) a manganese source, (iv) a lithium source, and (v) an oxygen source,
- the relative amounts of each of said sources being selected to yield, following step (c), a compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0.;
- (b) treating said solution to form a gel;
- and
- (c) heating said gel under an inert atmosphere for a time and at a temperature sufficient to yield a compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0.
A process for preparing a compound comprising the steps of:
- (a) combining (i) a chromium source, (ii) a nickel source, (iii) a manganese source, (iv) a lithium source, and (v) an oxygen source,
- the relative amounts of each of said sources being selected to yield, following step (c), a compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0;
- (b) grinding said mixture to form a substantially homogenous powder;
- and
- (c) heating said powder under an inert atmosphere for a time and at a temperature sufficient to yield a compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0.
Dependencies are inferred from the claim text.