Lithium transition metal oxide with gradient of metal composition
AssigneeLG Chem, Ltd.
InventorsJens Martin Paulsen, Ki Young Lee, Joon Sung Bae, Mun Ju Kim
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Abstract
Disclosed are primary materials, precursor materials and final materials as well as methods to prepare these materials. The final materials are mixed lithium transition metal oxides, useful as performance optimized cathode materials for rechargeable lithium batteries. The transition metal is a solid solution mixture of manganese, nickel and cobalt, M=(Mn1-uNiu)1-u-yCoy, with 0.2.
Claims16
A powderous transition metal compound comprising:
- at least 85% w/w of transition metal and oxygen,
- wherein the powder includes particles, which have a significant spatial change of transition metal stoichiometry, having an average transition metal composition M=(Mn1−uNiu)1−yCoy where 0.2<u<0.7 and 0.1<y<0.9,
- wherein the average transition metal composition of cobalt as well as manganese as well as nickel in the outer bulk differ by at least 10% in stoichiometry from the average transition metal composition of the inner bulk,
- the inner bulk being specified as a region around the center of the particle including about 50% of the total number of cobalt, nickel and manganese atoms of the particle.
A powderous lithium metal oxide, wherein at least 90% of the metal is transition metal with an average transition metal composition M=(Mn1−uNiu)1−yCoy where 0.4<u<0.65 and 0.2<y<0.9,
- the powder consisting of particles which have
- the same layered crystal structure with space group r-3m everywhere in the bulk of typical particles
- a significant spatial change of transition metal stoichiometry, where the average transition metal compositions of cobalt as well as manganese as well as nickel in the outer bulk differ by at least 10% in stoichiometry from the average transition metal compositions of the inner bulk,
- the inner bulk being specified as a region around the center of the particle including about 50% of the total number of cobalt, nickel and manganese atoms of the particle.
Dependencies are inferred from the claim text.