High-capacity electrode active material for secondary battery

Abstract

Disclosed is an electrode active material comprising: a core layer capable of repeating lithium intercalation / deintercalation; an amorphous carbon layer; and a crystalline carbon layer, successively, wherein the crystalline carbon layer comprises sheet-like carbon layer units, and the c-axis direction of the sheet-like carbon layer units is perpendicular to a tangent direction of the electrode active material particle. A secondary battery comprising the same electrode active material is also disclosed.

Description

technical field [0001] The present invention relates to an electrode active material for a secondary battery, and a secondary battery comprising the same. Background technique [0002] Generally, a lithium secondary battery is obtained by using a material capable of intercalating / extracting lithium ions as a cathode and an anode, and injecting an organic electrolyte or a polymer electrolyte between the cathode and the anode. These lithium secondary batteries generate electricity through redox action caused by intercalation / extraction of lithium ions between a cathode and an anode. [0003] Currently, carbonaceous materials have been used as electrode active materials forming anodes of lithium secondary batteries. However, in order to further increase the capacity of lithium secondary batteries, electrode active materials with higher capacity are still required. [0004] In order to meet these needs, metals exhibiting higher charge / discharge capacity than carbonaceous mater...

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Problems solved by technology

[0006] However, the above-mentioned electrode active materials are still insufficient to provide excellent cycle life characteristics, and therefore cannot be used as practical electrode active materials for lithium secondary batteries.

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