Cathode active material for a sodium ion battery coated by N-doped carbon formed from polydopamine precursor and preperation methods thereof

摘要

The present invention relates to a positive electrode active material for a sodium ion battery coated by nitrogen-doped carbon formed from a polydopamine precursor and a method of preparing the same. The positive electrode active material for a sodium ion battery according to the present invention increases an active site of sodium through a high surface area with an improved electrical conductivity by coating a nitrogen-doped porous carbon layer formed by carbonizing polydopamine on the surface of a NASICON-based compound, and greatly improves performance of a positive electrode material at a high rate and a high temperature. Also, since there is no need to use an additional doping precursor and a carbon precursor is nontoxic, a positive electrode active material can be prepared in an eco-friendly method. In addition, it is possible to provide a driving force for uniformly forming a nitrogen-doped porous carbon layer based on high adhesion of polydopamine.