Electronics and Telecommunications Research Institute

Xianglan Wu

Kwang Sun Ryu

Soon Ho Chang

Yong Joon Park

Kwang Man Kim

Young Gi Lee

Young Sik Hong

Young-Sik Hong

Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[LiCrTiMn]Owhere 0&#x2266;x&#x2266;0.3, 0&#x2266;y&#x2266;0.3 and 0.1&#x2266;x+y&#x2266;0.3, and layered a-LiFeOstructure. A method of synthesizing the lithium-chromium-titanium manganese oxide includes preparing a first mixed solution by dispersing titanium dioxide (TiO) in a mixed solution of chrome acetate (Cr(OH)(CHCO)) and manganese acetate ((CHCO)Mn.4HO), adding a lithium hydroxide (LiOH) solution to the first mixed solution to obtain homogeneous precipitates, forming precursor powder that has the formula Li[LiCrTiMn]Owhere 0&#x2266;x&#x2266;0.3, 0&#x2266;y&#x2266;0.3 and 0.1&#x2266;x+y&#x2266;0.3 by heating the homogeneous precipitates, and heating the precursor powder to form oxide powder having a layered structure.

Cathode composition for lithium batteries and method of preparing the same

Provided is a lithium-cobalt-manganese oxide having the formula Li[CoLiMn]O(0.05&#x3c;X&#x3c;0.9) which provide a stable structure and a superior discharge capacity, and the method of synthesizing of the same. The method of synthesizing the oxides according to the present invention comprises: preparing an aqueous solution of lithium salt, cobalt salt, and manganese salt; forming a gel by burning the aqueous solution; making oxide powder by burning the gel; forming a fine oxide powder having a layered structure by the twice of treatments. The lithium-cobalt-manganese oxide synthesized according to the present invention has a stable and superior electrochemical characteristic. The oxide is synthesized by simple and low cost heat treatment process.

Li-Co-Mn oxide as cathode material for lithium batteries and method of synthesis of the same

A method of preparing layered lithium-chromium-manganese oxides having the formula Li[CrLiMn]Owhere 0.1&#x2266;X&#x2266;0.5 for lithium batteries. Homogeneous precipitation is prepared by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr(OH)(CHCO)) and manganese acetate ((CHCO)Mn.4HO), while precursor powders are prepared by firing the precipitation. After that, the precursor powders are subjected to two heat treatment to yield Li[CrLiMn]Owith &#x3b1;-LiFeOstructure.

Method of preparing layered lithium-chromium-manganese oxides for lithium batteries

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Daejeon, South Korea

Xianglan Wu