Lg Chem, Ltd

Hanwha Chemical Corporation

Young-Sik Hahn

Sung-Kyun Chang

Sang-Hoon Choy

Ki-Young Lee

Min-Chul Jang

Kyu-Ho Song

Wan-Jae Myeong

Joo-Hyeong Lee

Myung-Ho Cho

Eui-Yong Bang

Yong-Tae Lee

Saebomi Park

Disclosed is a method for preparing a lithium-metal composite oxide, the method comprising the steps of: (a) mixing an aqueous solution of one or more transition metal-containing precursor compounds with an alkalifying agent and a lithium precursor compound to precipitate hydroxides of the transition metals; (b) mixing the mixture of step (a) with water under supercritical or subcritical conditions to synthesize a lithium-metal composite oxide, and drying the lithium-metal composite oxide; and (c) subjecting the dried lithium-metal composite oxide either to calcination or to granulation and then calcination. Also disclosed are an electrode comprising the lithium-metal composite oxide, and an electrochemical device comprising the electrode. In the disclosed invention, a lithium-metal composite oxide synthesized based on the prior supercritical hydrothermal synthesis method is subjected either to calcination or to granulation and then calcination. Thus, unlike the prior dry calcination method or wet precipitation method, a uniform solid solution can be formed and the ordering of metals in the composite oxide can be improved. Accordingly, the lithium-metal composite oxide can show crystal stability and excellent electrochemical properties.

Preparation method of lithium-metal composite oxides

The present invention relates to a lithium-containing metal composite oxide comprising paramagnetic and diamagnetic metals, which satisfies any one of the following conditions: (a) the ratio of intensity between a main peak of 0&#xb1;10 ppm (I) and a main peak of 240&#xb1;140 ppm (I), (I/I), is less than 0.117&#xb7;Z wherein z is the ratio of moles of the diamagnetic metal to moles of lithium; (b) the ratio of line width between the main peak of 0&#xb1;10 ppm (I) and the main peak of 240&#xb1;140 ppm (I), (W/W), is less than 21.45; and (c) both the conditions (a) and (b). The peaks of the lithium-containing metal composite oxide are obtained according to the 7Li&#x2014;NMR measurement conditions and means disclosed herein.

Lithium-metal composite oxides and electrochemical device using the same

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Daejeon, South Korea

Young-Sik Hahn