期刊
NANOSCALE
卷 12, 期 21, 页码 11427-11434出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr00898b
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资金
- Tianjin Science and Technology Project [19YFSLQY00070]
- opening Foundation of State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology [oic-201901004]
Bunches of oriented K2Ti6O13 nanorods coated by a thin carbon layer (4-7 nm) were prepared by combining hydrothermal and heat treatment in sequence. The K2Ti6O13 nanorods possess long- and short-axis crystal orientations of and , respectively, contributing to fast K+ diffusion, and the carbon-coating layer improves the electron conductivity. In addition, the obtained K2Ti6O13/carbon has a high compaction density, which is beneficial for realizing high volumetric specific capacity. When evaluated as a potassium-ion battery anode, the nanorods demonstrated a superior rate capability (122.5, 104.3, 92.3, 78.6 and 65.1 mA h g(-1) at current densities of 20, 50, 100, 200 and 500 mA g(-1), respectively), a favourable cycle life (118.5 mA h g(-1) at 25 mA g(-1) for 200 cycles) and high capacity retention.
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