Facile synthesis and stable cycling ability of hollow submicron silicon oxide–carbon composite anode material for Li-ion battery

• Published in: Journal of alloys and compounds Vol. 633; pp. 92 - 96
• Main Authors: Kim, Joong-Yeon, Nguyen, Dan Thien, Kang, Joon-Sup, Song, Seung-Wan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.06.2015
• Subjects: Chelation; Hollow microstructure; Lithium-ion battery; Silicon oxide–carbon composite; Submicron; Chelation; Submicron; Lithium-ion battery; Silicon oxide–carbon composite; Hollow microstructure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2015.01.309

•Hollow submicron SiO2–carbon composite material was synthesized using Si4+-citrate chelation.•Composite material possessed a homogeneous distribution of SiO2 and carbon.•Composite electrode delivered ⩾600mAh/g with a stable cycling stability.•This materials design and synthesis provides a useful platform for scalable production. Advanced SiO2–carbon composite anode active material for lithium-ion battery has been synthesized through a simple chelation of silicon cation with citrate in a glyme-based solvent. The resultant composite material demonstrates a homogeneous distribution of constituents over the submicron particles and a unique hollow spherical microstructure, which provides an enhanced electrical conductivity and better accommodation of volume change of silicon during electrochemical charge–discharge cycling, respectively. As a result, the composite electrode exhibits a high cycling stability delivering the capacity retention of 91% at the 100th cycle and discharge capacities of 662–602mAh/g and coulombic efficiencies of 99.8%. This material synthesis is scalable and cost-effective in preparing various submicron or micron composite electrode materials.