- METAL-COATED CARBON PREPARATION METHOD THEREOF AND COMPOSITE ELECTRODE AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME

摘要

PURPOSE: A carbon active material, its preparation method, a carbon negative electrode containing the active material and a lithium secondary battery containing the carbon active material are provided, to improve the conductivity, the high efficiency charge/discharge characteristic and the cycle lifetime characteristic of an electrode. CONSTITUTION: The carbon active material comprises a thin film or a cluster layer made of a metal or a metal oxide with a thickness of 1-300 nm on the surface. Preferably the metal in the metal or the metal oxide is selected from the group consisting of Li, Al, Sn, Bi, Si, Sb, Ni, Cu, Ti, V, Cr, Mn, Fe, Co, Ag, and their alloy; and the carbon is graphite, coke or hard carbon. The method comprises the steps of suspending a carbon particle at a temperature of 100 deg.C or less by using a gas to form a layer; spraying a metal salt solution to the suspended carbon particle layer to coat the carbon particle with the metal sa and heating the coated carbon particle at a temperature of 200-800 deg.C under the gas condition selected from hydrogen, nitrogen and argon.