초록 ▼

A method of preparing layered lithium-chromium-manganese oxides having the formula Li[CrxLi(1/3?x/3) Mn(2/3?2x/3)]O2 where 0.1?X?0.5 for lithium batteries. Homogeneous precipitation is prepared by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr3(OH)2(CH3CO2)7) an

A method of preparing layered lithium-chromium-manganese oxides having the formula Li[CrxLi(1/3?x/3) Mn(2/3?2x/3)]O2 where 0.1?X?0.5 for lithium batteries. Homogeneous precipitation is prepared by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O), while precursor powders are prepared by firing the precipitation. After that, the precursor powders are subjected to two heat treatment to yield Li[CrxLi(1/3?x/3) Mn(2/3?2x/3)]O2 with α-LiFeO2 structure.

대표청구항 ▼

1. A method of preparing layered lithium-chromium-manganese oxides for lithium batteries, comprising the steps of:preparing a homogeneous precipitation by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O); pr

1. A method of preparing layered lithium-chromium-manganese oxides for lithium batteries, comprising the steps of:preparing a homogeneous precipitation by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O); preparing precursor powders having the formula Li[CrxLi(1/3?x/3)Mn(2/3?2x/3)]O2 where 0.1?X?0.5 by firing the homogeneous precipitation; and preparing layered oxide powders by heat treating the precursor powders. 2. The method as claimed in claim 1, wherein the preparation of the precursor powder comprises:heating the homogeneous precipitation to remove excess water; and firing the homogeneous precipitation by heating the homogeneous precipitation on a hot plate. 3. The method as claimed in claim 2, wherein the firing of the homogeneous precipitation on a hot plate is performed after the viscous precipitation is coated on titanium foil.4. The method as claimed in claim 1, wherein the heat treatment of the precursor powders comprises:firing at a temperature T1, which is in the range of 650 to 700° C.; and annealing at a temperature T2 which is higher than T1 temperature. 5. The method as claimed in claim 4, wherein the temperature T2 is in the range of 900 to 1000° C.6. The method as claimed in claim 4, further comprising grinding the precursor powders fired at temperature T1 before annealing at temperature T2.7. The method as claimed in claim 4, wherein the annealing at temperature T2 is performed in air.8. The method as claimed in claim 4, further comprising quenching the precursor powders annealed at temperature T2.