Fabrication and lithium intercalation properties of epitaxial Li₂RuO₃ thin films

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• 作者：Yueming Zheng^a ; ^b ; Sou Taminato^a ; Kota Suzuki^a ; Masaaki Hirayama^a ; ^{hirayama@echem.titech.ac.jp} ; Ryoji Kanno^a
• 关键词：Lithium excess layered material ; Lithium diffusion ; Epitaxial thin-film ; Lithium batteries ; Lithium ruthenate
• 刊名：Thin Solid Films
• 出版年：2012
• 期刊代码：78_00406090
• 类别：ph
• 出版时间：31 May, 2012
• 卷：520
• 期：15
• 页码：4889-4893
• 文件大小：755 K

摘要

Lithium intercalation in a lithium excess layered material Li₂RuO₃ was investigated using two-dimensional model electrodes with a restricted reaction plane of (002). Li₂RuO₃ films were synthesized on Al₂O₃(0001) substrate by a pulsed laser deposition, and X-ray diffraction measurements confirmed epitaxial growth of Li₂RuO₃(002). Electrochemical characterization using cyclic voltammetry and charge/discharge measurements indicated electrochemical reactions with a discharge capacity of 200 mAh g^鈭?#xA0;1 for the film deposited at 400 掳C followed by post-annealing at 550 掳C. The electrochemical activity on the (002) plane indicated three-dimensional lithium diffusion in the two-dimensional layered rocksalt structure through the lithium sites in the transition metal layer.