Method for preparing cathode active material
AssigneeIndustry-University Cooperation Foundation Hanyang University Erica Campus
InventorsJin Ho Bang, Moo Dong Lee
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Abstract
A method for preparing a cathode active material is provided. The method for preparing a cathode active material can comprise the steps of: preparing a first metal oxide; preparing a second metal oxide having an oxygen ratio lower than that of the first metal oxide by heat treating the first metal oxide in a nitrogen-containing gas atmosphere; and preparing a lithium metal oxide by firing the second metal oxide and a lithium salt.
Claims13
A method for preparing a cathode active material, the method comprising:
- mixing a metal source containing acid and a powder source containing hydrogen carbonate in solvent to produce a metal oxide precursor containing metal, carbon, and oxygen;
- heat-treating the metal oxide precursor to produce a first metal oxide having a first oxygen ratio;
- heat-treating the first metal oxide at a first temperature, in a nitrogen-containing gas atmosphere that includes ammonia, to produce a second metal oxide having a second oxygen ratio that is lower than the first oxygen ratio, wherein the second metal oxide includes
- a core portion containing the second metal oxide,
- a shell portion surrounding the core portion and containing the second metal oxide, and
- a pore area that surrounds the core portion and that is provided between the core portion and the shell portion;
- pulverizing a mixture of the second metal oxide and LiOH H2O into a powder;
- and
- heat-treating the powder at a second temperature, in an O2 gas environment, wherein heat-treating the powder causes lithium to diffuse into the second metal oxide, thereby producing a lithium metal oxide as a cathode active material, and wherein the second temperature is higher than the first temperature.
A method for preparing a cathode active material, the method comprising:
- mixing a metal source containing acid and a powder source containing hydrogen carbonate in solvent to produce a metal oxide precursor containing metal, carbon, and oxygen;
- heat-treating the metal oxide precursor to produce a first metal oxide having a first oxygen ratio;
- heat-treating the first metal oxide at a first temperature in an ammonia atmosphere to produce a second metal oxide having a second oxygen ratio that is lower than the first oxygen ratio;
- pulverizing a mixture of the second metal oxide and LiOH H2O into a powder;
- and
- heat-treating the powder at a second temperature, in an O2 gas environment, wherein heat-treating the powder produces a lithium metal oxide as a cathode active material, and wherein the second temperature is higher than the first temperature.
Dependencies are inferred from the claim text.