Tunable lithium storage properties of metal lithium titanates by stoichiometric modulation |
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| Institution: | 1. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea;2. World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea;3. Department of Chemical Engineering, University of Seoul, Seoul 130-743, Republic of Korea;1. Department of Materials Science and Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States;2. Department of Materials Science and Engineering, Clemson University, Anderson, SC 29625, United States;3. Signatures Science and Technology Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States |
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| Abstract: | A simple stoichiometric modulation of Na2 − 2xSrxLi2Ti6O14 was developed to achieve tunable electrochemical properties of the material. The concept was confirmed experimentally and theoretically using density functional theory (DFT) calculations. Both the operating potential and the amount of reversibly intercalated lithium ions were manipulated by simply changing the Na/Sr ratio. These unique characteristics originated from a gradual change in the electron density on the Ti atoms and the extra lithium insertion sites at SrLi2Ti6O14. As a promising anode material for lithium-ion batteries, Na2 − 2xSrxLi2Ti6O14 and its tunable electrochemical properties have significant importance in terms of the development of tailored electrodes with desirable electrochemical performance. |
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