Electrochemical Properties of Chemically Processed SiO _<i>x</i> as Coating Material in Lithium-Ion Batteries with Si Anode

다국어 초록 (Multilingual Abstract)

<P>A SiO<SUB><I>x</I></SUB> coating material for Si anode in lithium-ion battery was processed by using SiCl<SUB>4</SUB> and ethylene glycol. The produced SiO<SUB><I>x</I></SUB> particles after heat treatment at 725°C for 1 h were porous and irregularly shaped with amorphous structure. Pitch carbon added to SiO<SUB><I>x</I></SUB> was found to strongly affect solid electrolyte interphase stabilization and cyclic stability. When mixed with an optimal amount of 30 wt% pitch carbon, the SiO<SUB><I>x</I></SUB> showed a high charge/discharge cyclic stability of about 97% for the 2nd to the 50th cycle. The initial specific capacity of the SiO<SUB><I>x</I></SUB> was measured to be 1401 mAh/g. On the basis of the evaluation of the SiO<SUB><I>x</I></SUB> coating material, the process utilized in this study is considered an efficient method to produce SiO<SUB><I>x</I></SUB> with high performance in an economical way.</P>