Artificial graphite, natural graphite, hard carbon, such as carbon-based materials as anode active material have been applied, According to the requirements of high capacity, high theoretical capacity such Si (ca. 4200mAh/g) which is 5 times higher than carbon-based mateirlas has been actively studied in recent years.

There are several problems to overcome despite the advantages of the theoretical capacity values of the Si.

First low electrical conductivity, second due to the significant change in volume of the active material of the Si particle during Li insertion/extraction, it causes pulverization of the active material particels.

In order to overcome these problems, the mixture of high carbon Si/carbon composite was synthesized, but showed a limitation in the number of times the cycle test because of the lack of sufficient change in volume of the internal volume of Si.

Our study was performed to study the synthesis of a nanoparticle dual carbon-coated Si porous-C composite using glucose and PVDF to form an inner space. Also, GO was added to improve the cyclability.

Characterization of Si porous-C was explored by Scaning transmission electron microscopy (STEM), X-ray photoelectron scpectroscopy (XPS) and the electrochemical performace was carried out as shown in figure. 

Two different current density (100, 500mA/g) was applied. 100mA/g was applied upto 5th cycles and the rest of cycels was obtained at 500mA/g.