Preparation and cycling performance of Aland F co-substituted compounds Li4AlxTi5−xFyO12−y |
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Authors: | Shahua Huang Zhonghua Gu Xiujian Zhu |
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Affiliation: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China |
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Abstract: | Li4AlxTi5−xFyO12−y compounds were prepared by a solid-state reaction method. Phase analyses demonstrated that both Al3+ and F− ions entered the structure of spinel-type Li4Ti5O12. Charge-discharge cycling results at a constant current density of 0.15 mA cm−2 between the cut-off voltages of 2.5 and 0.5 V showed that the Al3+ and F− substitutions improved the first total discharge capacity of Li4Ti5O12. However, Al3+ substitution greatly increased the reversible capacity and cycling stability of Li4Ti5O12 while F− substitution decreased its reversible capacity and cycling stability slightly. The electrochemical performance of the Al3+-F−-co-substituted specimen was better than the F−-substituted one but worse than the Al3+-substituted one. |
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Keywords: | Lithium secondary batteries Electrochemical performance Doping Li4Ti5O12 Li4AlxTi5&minus xFyO12&minus y |
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