Korea Basic Science Institute

Jin Bae Lee

Hae Jin Kim

Won Gi Hong

Yeon Ho Kim

Sang Moon Lee

Jong Guk Kim

You Na Ko

Soon Chang Lee

The present disclosure provides a process for the production of a cathode active material complex which is used for a lithium secondary battery, comprising the steps of: mixing a lithium metal phosphate with a solvent to prepare a first precursor; mixing the first precursor with a graphene oxide to prepare a second precursor solution; forming droplets from the second precursor solution; and making the droplets into a powder; wherein the formation of the powder is performed by spray pyrolysis method.

Manufacturing method for cathode active material complex, and lithium secondary battery including the cathode active material complex

Provided are a cathode active material for a lithium secondary battery which is represented by general formula (1) below and has a nanorod shape, a manufacturing method thereof, and a lithium secondary battery including the same.LiNiMnMO&#x2003;&#x2003;(1)

Nanorod-shaped cathode active material for lithium secondary battery, manufacturing method thereof, and lithium secondary battery including the same

The present disclosure relates to manganese oxide nano-rods in the form of a core-shell, in which the manganese oxide nano-rods are formed in a core-shell structure, the core and the shell each include MnO, when x of MnOof the core is 1 and y is 2, x of MnOof the shell is 2 and y is 3, and when x of MnOof the core is 2 and y is 3, x of MnOof the shell is 1 and y is 2. According to the present disclosure, in the secondary battery using the manganese oxide, the elution of manganese is inhibited and the structural stability of an active material is increased, thereby increasing the capacity and the cycle life at a high temperature.

Manganese oxide nano-rods in the form of a core-shell, a method for producing the same, and an active material for a secondary battery comprising the same

The present disclosure relates to a lithium-transition metal-silicate complex that is formed into a sphere with a hollow, in which a radius of the hollow is in a range of 0.5 to 3.0 nm, and a diameter of the lithium-transition metal-silicate complex is in a range of 5 to 10 nm. The present disclosure enables to facilitate the mass production of a complex including a lithium-transition metal-silicate complex, having a micro-sized hollow, and having a spherical shape. In addition, when using a lithium-transition metal-silicate complex of the present disclosure as a cathode active material for a lithium secondary battery, it is capable of providing a cathode active material for a lithium-ion battery excellent in charging and discharging characteristics as well as in high-rate characteristics. In addition, a lithium-transition metal-silicate complex manufactured according to the present disclosure may implement properties of materials of lithium, transition metal, and silicate as well as its structural characteristics, and thus, it can be effectively applied in various industrial fields.

Hollow spherical lithium-transition metal-silicate composites, preparation method thereof, and cathode active material for lithium secondary batteries comprising the same

The present invention relates to a method for preparing anatase-type titanium dioxide (TiO) nanoparticles, the method comprising the steps of: uniformly mixing titanium n-butoxide and cetyltrimethyl ammonium salt (CTAS) in water; subjecting the mixture to hydrothermal treatment at a temperature of 60&#x2dc;120&#xb0; C.; and collecting anatase-type titanium dioxide nanoparticles produced by the hydrothermal treatment and drying the collected nanoparticles. According to the present invention, anatase-type titanium dioxide nanoparticles having excellent crystallinity can be easily prepared in large amounts by a simple process without needing heat treatment.

Method for preparing uniform anatase-type titanium dioxide nanoparticles

The present invention relates to methods for manufacturing manganese oxide nanotubes/nanorods using an anodic aluminum oxide (AAO) template. In the inventive methods, the manganese oxide nanotubes/nanorods are manufactured in mild conditions using only a manganese oxide precursor and an anodic aluminum oxide template without using any solvent. The nanotubes/nanorods having uniform size can be easily obtained by adsorbing the manganese oxide precursor onto the surface of the anodic aluminum oxide template by a vacuum forming process using a vacuum filtration apparatus so as to maintain the shape of nanotubes/nanorods and drying the manganese oxide nanotubes. The manganese oxide nanotubes/nanorods made according to the inventive methods can be used as economic hydrogen reservoirs, the electrode of lithium secondary batteries, or the energy reservoirs of vehicles or other transport means.

Growing community of inventors

Daejeon, South Korea

Jin Bae Lee