Yonsei University

Hyundai Motor Company

Kia Motors Corporation

Industry-academic Cooperation Foundation

Kwang Bum Kim

Hyun Kyung Kim

Ji Young Kim

Jin Ho Park

Il Hwan Kim

Kyung Wan Nam

Ha Kyung Roh

Kwang Heon Kim

Myeong Seong Kim

Jin Go Kim

Sang Bok Ma

Sodium negative active material may have a metal phosphate having a uniform size distribution structures to graphene surface. The negative active material is a metal or a metal oxide precursor in a graphite dispersion solution; And the addition of phosphate, and then applying a microwave, can be produced by heat treatment.

Negative active material for sodium secondary battery, method for preparing thereof and sodium secondary battery using the same

A spinel-type lithium titanium oxide/graphene composite and a method of preparing the same are provided. The method can be useful in simplifying a manufacturing process and shortening a manufacturing time using microwave associated solvothermal reaction and post heat treatment, and the spinel-type lithium titanium oxide/graphene composite may have high electrochemical performances due to its excellent capacity and rate capability and long lifespan, and thus be used as an electrode material of the lithium secondary battery.

Spinel-type lithium titanium oxide/graphene composite and method of preparing the same

Provided is a method of preparing a complex of a transition metal oxide and carbon nanotube. The method includes (a) dispersing carbon nanotube powder in a solvent, (b) mixing the dispersion with a transition metal salt, and (c) synthesizing a complex of transition metal oxide and carbon nanotube by applying microwave to the mixed solution. The method may considerably reduce the time required to synthesize the complex. In the complex of transition metal oxide and carbon nanotube prepared by the method, the transition metal oxide may be stacked on the surface of the carbon nanotube in the size of a nanoparticle, and may enhance charge/discharge characteristics when being applied to a lithium secondary battery as an anode material.

Preparation method of transition metal oxide and carbon nanotube composite, and composite thereof

A method for the synthesis of nanocomposites is provided. The method comprises the steps of mixing carbon nanotubes with a urea solution to form urea/carbon nanotube composites (first step), mixing the urea/carbon nanotube composites with a solution of a metal oxide or hydroxide precursor to prepare a precursor solution (second step), and hydrolyzing the urea in the precursor solution to form a metal oxide or hydroxide coating on the carbon nanotubes (third step). Further provided are nanocomposites synthesized by the method. In the nanocomposites, a metal oxide or hydroxide is coated to a uniform thickness in the nanometer range on porous carbon nanotubes. Advantageously, the thickness of the coating can be easily regulated by controlling the urea content of urea/carbon nanotube composites as precursors. In addition, the nanocomposites are nanometer-sized powders and have high electrical conductivity and large specific surface area. Therefore, the nanocomposites are useful as electrode active materials for electrochemical capacitors, including pseudo capacitors and electrochemical double layer capacitors, lithium secondary batteries, and polymer batteries. Further provided is a capacitor comprising the nanocomposites.

Nanocomposites, synthesis method thereof and capacitor comprising the same

The present invention relates to a method for manufacturing a nano-structured metal oxide electrode, and in particular, to a method for manufacturing a metal oxide electrode having a few tens or hundreds of nanometers in diameter that is well adapted to an electrode of a supercapacitor using an alumina or polymer membrane having nano-sized pores as a template. Preferred methods for manufacturing a nano-structured metal oxide electrode comprises steps of preparing an alumina or polymer template having a plurality of nano-sized pores; sputtering a metal acting as a current collector with a few tens of &#x3bc;m of thickness in one surface of the alumina template; charging the template, after the sputtering step, by submerging it into a precipitation solution having a metal salt dissolved therein, and applying a static current or electrode electric potential thereby electrochemically precipitating a metal oxide in the nano-sized pores of the template; a step in which the composite of the alumina or polymer template and the metal oxide are contacted with a sodium hydroxide solution or other base to remove the alumina or polymer template; and an optional drying step to provide the nano-structured metal oxide electrode.

Method for manufacturing a nano-structured electrode of metal oxide

Growing community of inventors

Gyeonggi-do, South Korea

Kwang Bum Kim