Korea Institute of Science and Technology

Un Sek Kim

Hyung Sun Kim

Byung Won Cho

Won Il Cho

Joong Kee Lee

Kyung Suk Yun

Joo Man Woo

Chi Hum Paik

Dalkeun Park

A carbon anode active material for lithium secondary battery comprising a cluster or thin film layer of a metal or metal oxide coated onto the surface of the carbon active material, a preparation method thereof, and a metal-carbon hybrid electrode and a lithium secondary battery comprising the same. The carbon active material is prepared through a gas suspension spray coating method. An electrode comprising the carbon active material according to the present invention shows excellent conductivity, high rate charge/discharge characteristics, cycle life characteristics and electrode capacity close to theoretical value.

Carbonaceous materials coated with a metal or metal oxide, a preparation method thereof, and a composite electrode and lithium secondary battery comprising the same

A homogeneous solid polymer alloy electrolyte comprises a total 100 weight % of mixture of (a) from 5 to 90 weight % comprising one of polyacrylonitrile-based (PAN-based) solid polymers and poly(methyl methacrylate)-based (PMMA-based) solid polymers which have superior adhesion and ion conductivity, (b) from 5 to 80 weight % comprising one of poly(vinylidene fluoride)-based (PVdF-based) solid polymers and the PMMA-based solid polymers which have superior compatibility with an organic solvent electrolyte, (c) from 5 to 80 weight % comprising one of poly(vinyl chloride)-based (PVC-based) solid polymers and the PVdF-based solid polymers which have superior mechanical strength. The solid polymer alloy electrolyte has superior ion conductivity, compatibility with an organic solvent and mechanical strength. A lithium polymer battery manufactured by making the composite anode and cathode using the solid polymer alloy electrolyte, and stacking the solid polymer alloy electrolyte and the composite anode(cathode) in several times, has excellent adhesion, mechanical stability, low/high temperature characteristics, high rate discharge, charge/discharge properties, and battery capacity and battery cycle life characteristics.

Solid polymer alloy electrolyte in homogeneous state and having a monolayered structure

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Seoul, South Korea

Un Sek Kim