Investigation the sodium storage kinetics of H1.07Ti1.73O4@rGO composites for high rate and long cycle performance |
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Authors: | Lijuan Hou Tingting Xu Ruichao Liu Huiyu Yuan Dezhi Kong Weixia Shen Jinhao Zang Xinjian Li Ye Wang |
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Affiliation: | 1. Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China |
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Abstract: | Insertion type material has been attracted plenty of attentions as the anode of sodium ion batteries (SIBs) due to the low volume change induced long cycle stability. H1.07Ti1.73O4 (HTO), a two-dimensional layered material, is a new insertion type anode material for SIBs reported in this study. Layered HTO composites were decorated with rGO nanosheets via an electrostatic assembly method followed by hydrothermal treatment. When adapted as the anode material of SIBs, HTO@rGO composite exhibits an enhanced sodium ion storage behavior, including high rate capability and long cycle stability. It can deliver high capacities of 142.8 and 66.7 mA h g−1 at 100 and 10 000 mA g−1, respectively. Moreover, it can keep a capacity of 75.1 mA h g−1 at 5 A g−1 after even 5000 cycles, corresponding to a high capacity retention of 70.8% (0.0058% capacity decay per cycle). HTO exhibits a small volume expansion of 19.6% by in-situ transmission electron microscopy (in-situ TEM). The diffusion coefficient of sodium ions is increased from 1.77 × 10−14 cm2 s−1 in HTO composites to 4.80 × 10−14 cm2 s−1 in HTO@rGO composites. Our designed and synthesized HTO@rGO provides a new route for high rate and long cycle stable SIBs anode materials. |
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Keywords: | high rate capability HTO@rGO composites improved surface kinetics in-situ TEM investigation long cycle stability |
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