LITHIUM MULTIPLE METAL OXIDE-BASED CATHODE ACTIVE MATERIALS FOR LITHIUM SECONDARY BATTERIES
Provided is a cathode active material for a lithium-ion battery, wherein the cathode active material is selected from the group of lithium nickel cobalt metal oxides having a general formula Li x Ni y Co z M w O 2 , where M is selected from the group consisting of beryllium (Be), calcium (Ca), and combinations thereof with aluminum (Al), titanium (Ti), tungsten (W), chromium (Cr), molybdenum (Mo), magnesium (Mg), tantalum (Ta), and silicon (Si), and x ranges from 0 to 1.2, the sum of y+z+w ranges from 0.8 to 1.2, w range from 0 to 0.5, y and z are both greater than zero, and the ratio z/y ranges from 0 to 0.5. Preferably, M is selected from metal elements comprising combined Be and Mg, combined Ca and Mg, combined Ca and Be, or combined Be, Mg, and Ca.
1 . A cathode active material for a lithium-ion battery, wherein the cathode active material is selected from the group of lithium nickel cobalt metal oxides having a general formula Li x Ni y Co z M w O 2 , where M is selected from the group consisting of aluminum (Al), titanium (Ti), tungsten (W), chromium (Cr), molybdenum (Mo), magnesium (Mg), beryllium (Be), calcium (Ca), tantalum (Ta), silicon (Si), and combinations thereof and x ranges from 0 to 1.2, the sum of y+z+w ranges from 0.8 to 1.2, w range from 0 to 0.5, y and z are both greater than zero, and the ratio z/y ranges from 0 to 0.5.
2 . A cathode active material for a lithium-ion battery, wherein the cathode active material is selected from the group of lithium nickel cobalt metal oxides having a general formula Li x Ni y Co z M w O 2 , where M is selected from the group consisting of beryllium (Be), calcium (Ca), and combinations thereof with aluminum (Al), titanium (Ti), tungsten (W), chromium (Cr), molybdenum (Mo), magnesium (Mg), tantalum (Ta), and silicon (Si), and ranges from 0 to 1.2, the sum of y+z+w ranges from 0.8 to 1.2, w range from 0.25 to 0.5, y and z are both greater than zero, and the ratio z/y ranges from 0 to 0.5.
3 . The cathode active material of claim 1 , wherein M comprises elements selected from combined Be and Mg, combined Ca and Mg, combined Ca and Be, or combined Be, Mg, and Ca.
4 . The cathode active material of claim 2 , wherein M comprises elements selected from combined Be and Mg, combined Ca and Mg, combined Ca and Be, or combined Be, Mg, and Ca.
5 . The cathode active material of claim 2 , wherein said cathode active material is in a form of fine particles having a dimension from 10 nm to 20 μm.
6 . The cathode active material of claim 1 , wherein said cathode active material is in a form of fine particles having a dimension from 50 nm to 10 μm.
7 . A powder mass comprising multiple particles of the cathode active material of claim 1 .
8 . A cathode comprising the powder mass of claim 7 as a cathode active material for a lithium-ion cell or lithium metal secondary cell.
9 . A lithium-ion cell or lithium metal secondary cell comprising an anode, a cathode of claim 8 , and an electrolyte in ionic contact with the anode and the cathode.
10 . The lithium-ion cell or lithium metal secondary cell of claim 9 , wherein said anode comprises an anode active material selected from the group consisting of: (a) silicon (Si), germanium (Ge), phosphorus (P), tin (Sn), lead (Pb), antimony (Sb), bismuth (Bi), zinc (Zn), aluminum (Al), titanium (Ti), nickel (Ni), cobalt (Co), and cadmium (Cd); (b) alloys or intermetallic compounds of Si, Ge, P, Sn, Pb, Sb, Bi, Zn, Al, Ti, Ni, Co, or Cd with other elements; (c) oxides, carbides, nitrides, sulfides, phosphides, selenides, and tellurides of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Fe, Ni, Co, V, or Cd, and their mixtures, composites, or lithium-containing composites; (d) salts and hydroxides of Sn; (e) lithium titanate, lithium manganate, lithium niobium oxide, lithium titanium-niobium oxide, lithium aluminate, lithium-containing titanium oxide, lithium transition metal oxide, ZnCo 2 O 4 ; (f) particles of graphite; (g) lithium metal or lithium alloy containing greater than 80% by weight of lithium; and combinations thereof.
11 . A method of producing the cathode active material of claim 1 , said method comprising a procedure selected from co-precipitation, spray-drying, solid-state reaction, or combustion.