| 摘要 |
Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[Li<SUB>(1-x)/3</SUB>Cr<SUB>x</SUB>Ti<SUB>(2/3)y</SUB>Mn<SUB>2(1-x-y)/3</SUB>]O<SUB>2 </SUB>where 0<=x<=0.3, 0<=y<=0.3 and 0.1<=x+y<=0.3, and layered a-LiFeO<SUB>2 </SUB>structure. A method of synthesizing the lithium-chromium-titanium manganese oxide includes preparing a first mixed solution by dispersing titanium dioxide (TiO<SUB>2</SUB>) in a mixed solution of chrome acetate (Cr<SUB>3</SUB>(OH)<SUB>2</SUB>(CH<SUB>3</SUB>CO<SUB>2</SUB>)<SUB>7</SUB>) and manganese acetate ((CH<SUB>3</SUB>CO<SUB>2</SUB>)<SUB>2</SUB>Mn.4H<SUB>2</SUB>O), adding a lithium hydroxide (LiOH) solution to the first mixed solution to obtain homogeneous precipitates, forming precursor powder that has the formula Li[Li<SUB>(1-x)/3</SUB>Cr<SUB>x</SUB>Ti<SUB>(2/3)y</SUB>Mn<SUB>2(1-x-y)/3</SUB>]O<SUB>2 </SUB>where 0<=x<=0.3, 0<=y<=0.3 and 0.1<=x+y<=0.3 by heating the homogeneous precipitates, and heating the precursor powder to form oxide powder having a layered structure. |
