Hierarchical Porous Nanosheets Constructed by Graphene‐Coated,Interconnected TiO2 Nanoparticles for Ultrafast Sodium Storage |
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| Authors: | Baosong Li Baojuan Xi Zhenyu Feng Yue Lin Jincheng Liu Jinkui Feng Yitai Qian Shenglin Xiong |
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| Affiliation: | 1. Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, P. R. China;2. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, P. R. China;3. Key Laboratory for Liquid‐Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, P. R. China |
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| Abstract: | Sodium‐ion batteries (SIBs) are considered promising next‐generation energy storage devices. However, a lack of appropriate high‐performance anode materials has prevented further improvements. Here, a hierarchical porous hybrid nanosheet composed of interconnected uniform TiO2 nanoparticles and nitrogen‐doped graphene layer networks (TiO2@NFG HPHNSs) that are synthesized using dual‐functional C3N4 nanosheets as both the self‐sacrificing template and hybrid carbon source is reported. These HPHNSs deliver high reversible capacities of 146 mA h g?1 at 5 C for 8000 cycles, 129 mA h g?1 at 10 C for 20 000 cycles, and 116 mA h g?1 at 20 C for 10 000 cycles, as well as an ultrahigh rate capability up to 60 C with a capacity of 101 mA h g?1. These results demonstrate the longest cyclabilities and best rate capability ever reported for TiO2‐based anode materials for SIBs. The unprecedented sodium storage performance of the TiO2@NFG HPHNSs is due to their unique composition and hierarchical porous 2D structure. |
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| Keywords: | anodes C3N4 nitrogen‐doped graphene sodium‐ion batteries TiO2 nanosheets |
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