Journal
NANOSCALE
Volume 11, Issue 36, Pages 16781-16787Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr05264j
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Funding
- National Natural Science Foundation of China [21701163, 21671181, 21831006]
- Anhui Provincial Natural Science Foundation [1808085QB25]
- Nature Science Research Project of Anhui province [1808085QE127]
- Young Teachers Special Project of Hefei Normal University [2017QN16]
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The application of Si-based anode materials is hindered by their extreme volume change, poor cycling stability, and low coulombic efficiency. Solving these problems generally requires a combination of strategies, such as nanostructure designing or surface coating. However, these strategies increase the difficulty of the fabrication process. Herein, a simple and one-pot replacement reaction route was designed to produce an Al2O3 layer anchored on mesoporous Si nanospheres (Si@Al2O3) by employing Al nanospheres with a naturally formed Al2O3 layer as a reducing agent and self-sacrificial template. The obtained Si@Al2O3 was mesoporous, with enough porous space to buffer the volume change and provide a fast lithium ion transfer channel. Furthermore, the coated Al2O3 layer could stabilize the structure and SEI layer of the mesoporous Si nanospheres, endowing the Si@Al2O3 nanospheres with improved initial coulombic efficiency, cycling performance and rate capability. As a result, a high capacity of 1750.2 mA h g(-1) at 0.5 A g(-1) after 120 cycles and 1001.7 mA h g(-1) at 2 A g(-1) after 500 cycles were delivered for lithium ion batteries. The good performance could be attributed to the mesoporous structure and the outer-coated Al2O3 layer.
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