Patent ID: 8974962
Filing Date: 2015-03-10
Classification: B60L,H01M,Y02E,Y02T

Abstract:
1. An anode active material for secondary batteries, capable of intercalating and deintercalating ions, the anode active material comprising: a core consisting of a crystalline carbon-based material; and present on a surface of said core, a composite coating layer comprising one or more materials selected from a group consisting of low crystalline carbon and amorphous carbon, and a hydrophilic material, wherein the composite coating layer has (i) a structure in which a filler comprising a hydrophilic material is uniformly distributed in a matrix comprising one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon, or (ii) a structure in which a filler comprising one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon is uniformly distributed in a matrix comprising a hydrophilic material; wherein at least a part of the surface of the anode active material is coated with the hydrophilic material; wherein the hydrophilic material is at least one oxide that exhibits relatively high hydrophilicity compared to one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon and do not react with lithium; wherein an amount of the composite coating layer is 0.5 to 20% by weight, based on the total amount of the anode active material, and wherein the oxide is at least one selected from a group consisting of aluminum oxide, magnesium oxide and zirconium oxide.