Gradient cathode material for lithium rechargeable batteries
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United States of America Patent
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Jul 26, 2005
Grant Date -
Dec 19, 2002
app pub date -
Feb 11, 2002
filing date -
Jun 15, 2001
priority date (Note) -
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Abstract
A composition suitable for use as a cathode material of a lithium battery includes a core material having an empirical formula LixM′zNi1-;yM';yO2. 'x' is equal to or greater than about 0.1 and equal to or less than about 1.3. 'y' is greater than about 0.0 and equal to or less than about 0.5. 'z' is greater than about 0.0 and equal to or less than about 0.2. M′ is at least one member of the group consisting of sodium, potassium, nickel, calcium, magnesium and strontium. M'; is at least one member of the group consisting of cobalt, iron, manganese, chromium, vanadium, titanium, magnesium, silicon, boron, aluminum and gallium. A coating on the core has a greater ratio of cobalt to nickel than the core. The coating and, optionally, the core can be a material having an empirical formula Lix1Ax2Ni1-;y1-;z1Coy1Bz1Oa. 'x1' is greater than about 0.1 a equal to or less than about 1.3. 'x2,' 'y1' and 'z1' each is greater than about 0.0 and equal to or less than about 0.2. 'a' is greater than 1.5 and less than about 2.1. 'A' is at least one element selected from the group consisting of barium, magnesium, calcium and strontium. 'B' is at least one element selected from the group consisting of boron, aluminum, gallium, manganese, titanium, vanadium and zirconium.
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