Ternary mixed lithium oxides, process for preparing the same, and secondary lithium battery formed therefrom
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United States of America Patent
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Jun 27, 2000
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N/A
app pub date -
Jun 30, 1997
filing date -
Sep 30, 1994
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Abstract
Ternary lithium mixed oxides having a spinel-type crystal structure and the general formula (I) Li.sub.y Me.sub.x Mn.sub.2-x O.sub.4 are disclosed. In this formula (I), Me represents a metal cation from groups IIa, IIIa, Iva, IIb, IIIb, IVb, IVb, VIIb, and VIII of the Periodic Table of Elements, x is in a range between 0 and 1, and y is in a range of greater than zero and not more than 1.2. The ternary mixed lithium oxide is obtainable by reacting reaction components in the form of hydroxides and/or water-soluble metal salts dissolved in a basic aqueous medium to form a homogenous suspension of the hydroxylic reaction products, removing water and optionally further solvents from the suspension, and subjecting the dried reaction products to heat treatment by heating them to temperatures between 500.degree. C. and 900.degree. C. at a heating speed of between 1 K/min and 20 K/min. The respective mixed oxides obtained are in a form which has no phase having a radiographic effect. These mixed oxides are suitable, in particular, as cathode materials in lithium secondary batteries.
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