A nanosized silicon thin film as high capacity anode material for Li-ion rechargeable batteries

✍ Scribed by Hong Guo; Hailei Zhao; Chaoli Yin; Weihua Qiu

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 249 KB
• Volume: 131
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2006.04.008

✦ Synopsis

Silicon thin film with thickness in range 1000-5300 Å deposited on rough Cu foil by a radio frequency magnetron sputtering is used as anode materials for Li-ion rechargeable batteries. The SEM, XRD and TEM analysis reveals that the Si thin film has a floccular nano-sized multi-crystalline structure. Li ions insertion/extraction evaluation is performed mainly with constant current charge/discharge cycling and cyclic voltammetry (CV) at room temperature. The cycleability and reversible discharge capacity are found to depend on the film thickness, and thinner films give larger accommodation capacity. A 3120 Å Si film provides a reversible specific capacity over 3500 mA hg -1 with excellent cycleability under 0.5 C charge/discharge rate.