Anode active material and secondary battery comprising the same
View Patent ↗Disclosed are an anode active material for secondary batteries, capable of intercalating and deintercalating ions, comprising a core comprising a crystalline carbon-based material and a composite coating layer comprising one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon, and a metal and/or a non-metal capable of intercalating and deintercalating ions, wherein the composite coating layer comprises a matrix comprising one component selected from one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon and a metal and/or a non-metal capable of intercalating and deintercalating ions, and a filler comprising the other component, incorporated in the matrix, and a secondary battery comprising the anode active material.
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 metal and/or a non-metal capable of intercalating and deintercalating ions,
wherein the metal and/or non-metal capable of intercalating and deintercalating ions is exposed in at least a part of the surface of the composite coating layer;
wherein the composite coating layer has (i) a structure in which a filler comprising a metal and/or a non-metal capable of intercalating and deintercalating ions 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 metal and/or a non-metal capable of intercalating and deintercalating ions;
wherein an amount of the composite coating layer is 0.1 to 20% by weight, based on the total amount of the anode active material; and
wherein a content of one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon is 10 to 95% by weight and a content of the metal and/or a non-metal capable of intercalating and deintercalating ions is 5 to 90% by weight, based on the total amount of the composite coating layer, and
wherein the metal and/or non-metal capable of intercalating and deintercalating ions is at least one selected from a group consisting of Sn and an alloy of Si and Sn.
2. The anode active material according to claim 1 , wherein the crystalline carbon-based material comprises one or more of graphite and low crystalline carbon.
3. An anode mix comprising the anode active material according to claim 1 .
4. An anode for secondary batteries in which the anode mix according to claim 3 is applied to a current collector.
5. A secondary battery comprising the anode for secondary batteries according to claim 4 .
6. The secondary battery according to claim 5 , wherein the battery is a lithium secondary battery.
7. A battery pack comprising the secondary battery according to claim 6 .