High capacity and rate capability of core–shell structured nano-Si/C anode for Li-ion batteries

• Published in: Electrochimica acta Vol. 71; pp. 201 - 205
• Main Authors: Hwa, Yoon, Kim, Won-Sik, Hong, Seong-Hyeon, Sohn, Hun-Joon
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-06-2012; Elsevier
• Subjects: Anode materials; Applied sciences; Batteries; Carbon; Conduction; Core–shell structure; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Lithium batteries; Lithium-ion batteries; Nanocomposites; Nanomaterials; Nanostructure; Shells; Silicon; Lithium batteries; Silicon; Core–shell structure; Anode materials; Anode; Secondary cell; Electrode material; Core-shell particle; Carbon; Discharge charge cycle; Lithion ion batteries; Core-shell structure; Specific capacity; Electrical characteristic
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2012.03.138

Core–shell structured nano-Si/C (n-Si/C) anode material for Li ion batteries was prepared by substrate induced coagulation (SIC) method with nano-Si (n-Si) as core component and amorphous carbon as shell. The electronic conducting amorphous carbon shell of 5–10nm thickness which connected each n-Si particle like frog spawn shape not only buffered volume expansion of Si particles during the cycling but also acted as an electrical conducting pathway. This n-Si/C core–shell structured electrode showed a highly reversible capacity c.a. 1800mAhg−1 over 50 cycles, superior rate capability and good cycle retention.