期刊
NANOSCALE
卷 10, 期 10, 页码 4962-4968出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr06768b
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资金
- National Natural Science Foundation of China [51401110]
- Natural Science Foundation of Jiangsu Higher Education Institutions of China [16KJB150023]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
The practical application of Sn-M (M = Fe, Ni, Co, and Cu) alloys, a promising anodic category for lithium-ion batteries, is hindered primarily by their huge volume change upon cycling. Immobilization of Sn-M alloys within carbon matrices has proven to be effective to improve their cycling stability, but the traditional pyrolysis of separate Sn, M, and C precursors often leads to uneven distribution of the three components in Sn-M-C ternary anodes. Herein, we report a facile and general aerogel-derived pyrolysis route to realize homogeneous embedding of uniformly-sized Sn-M alloy nanocrystals, within a nanoporous carbon matrix, using cyano-bridged hetero-metallic (Sn-M) aerogels hybridized with carbon sources as precursors. Using the optimized citric acid (CA) as a carbon source, the formations of nanoporous Sn-Fe@C and Sn-Ni@C networks have been illustrated as examples through pyrolyzing CA/Sn-Fe and CA/Sn-Ni aerogels, respectively. By virtue of their compositional/structural superiorities toward lithium storage, the as-prepared Sn-Fe@C and Sn-Ni@C networks manifest higher capacities, enhanced cycling stability, and improved rate capability compared to the Sn-M-C composites and carbon samples derived from bare aerogels and CA precursors, respectively. Specifically, the Sn-Fe@C network manifests a high reversible capacity of 441.6 mA h g(-1) after 100 cycles at 100 mA g(-1) and an average capacity of 438.6 mA h g(-1) at 1 A g(-1). This work shows a new guideline for designing highly-uniform Sn-M-C, Sb-M-C, and Bi-M-C ternary anodes for boosting energy storage.
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