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Patterned Si thin film electrodes for enhancing structural stability. 2012

Gyu-Bong Cho, and Jung-Pil Noh, and Ho-Jin Sung, and Sang-Hun Lee, and Yeon-Min Im, and Hyo-Jun Ahn, and Ki-Won Kim
School of Materials Science and Engineering, Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Gazwadong 900, Jinju, Gyeongnam 660-701, Korea. kiwonkim@gnu.ac.kr.

A patterned film (electrode) with lozenge-shaped Si tiles could be successfully fabricated by masking with an expanded metal foil during film deposition. Its electrochemical properties and structural stability during the charge-discharge process were examined and compared with those of a continuous (conventional) film electrode. The patterned electrode exhibited a remarkably improved cycleability (75% capacity retention after 120 cycles) and an enhanced structural stability compared to the continuous electrode. The good electrochemical performance of the patterned electrode was attributed to the space between Si tiles that acted as a buffer against the volume change of the Si electrode.

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