Li2MTi6O14 (M=Sr,Ba): new anodes for lithium-ion batteries |
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| Institution: | 2. Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan;1. Kyoto Municipal Institute of Industrial Technology and Culture, 91 Chudouji Awata-cho, Shimogyo-ku, Kyoto 600-8813, Japan;2. Department of Life Science, Faculty of Science and Engineering, Setsunan University, 17-8 Ikedanaka-machi, Neyagawa, Osaka 572-8508, Japan;1. College of Mathematical and Physical Sciences, Shandong Advanced Optoelectronic Materials and Technologies Engineering Laboratory, Qingdao University of Science and Technology, Qingdao 266061, China;2. The Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100101, China |
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| Abstract: | Isostructural Li2MTi6O14 (M=Sr, Ba) materials, prepared by a solid state reaction method, have been investigated as insertion electrodes for lithium battery applications. These titanate compounds have a structure that consists of a three-dimensional network of corner- and edge-shared TiO6] octahedra, 11-coordinate polyhedra for the alkali-earth ions, and LiO4] tetrahedra in tunnels that also contain vacant tetrahedral and octahedral sites. Electrochemical data show that these compounds are capable of reversibly intercalating four lithium atoms in a three-stage process between 1.4 and 0.5 V vs. metallic lithium. The electrodes provide a practical capacity of approximately 140 mAh/g; they are, therefore, possible alternative anode materials to the lithium titanate spinel, Li4Ti5O12. The lithium intercalation mechanism and crystal structure of Li2MTi6O14 (M=Sr, Ba) electrodes are discussed and compared with the electrochemical and structural properties of Li4Ti5O12. The area-specific impedance (ASI) of Li/Li2SrTi6O14 cells was found to be significantly lower than that of Li/Li4Ti5O12 cells. |
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