期刊
MATERIALS TODAY ENERGY
卷 18, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2020.100528
关键词
Lithium-ion batteries; Gradient electrodeposition; High-throughput fabrication; Screening; Sn-Co-Sb alloy anode
资金
- National Key R&D Program of China [2016YFB0700600]
- National Natural Science Foundation of China [21776121]
Alloy anodes provide high capacity for high-energy lithium-ion batteries. Multi-element alloys require high-throughput fabrication technologies to facilitate the screening of alloy composition, morphologies, and structures. Here, we report a gradient electrodeposition method to prepare Sn-Co-Sb alloy anodes with varied Sn:Co:Sb ratios and demonstrate the effectiveness of gradient electrodeposition on alloy anode development. Using this technology, we can vary each metal element to form a gradient distribution in one direction by tilting the sample alternatively during each electrodeposition. Such gradient electrodeposition realizes the complex composition of Sn-Co-Sb alloys in one large sample, enabling high-throughput fabrication simultaneously. After annealing, the obtained Sn-Co-Sb alloy forms varied phases such as Sn, SnSb, and CoSn2. It is noted that the elemental ratio has a significant influence on the microstructures and electrochemical performances of the deposited Sn-Co-Sb alloy. The Sn-Co-Sb alloy with a ratio of 71.3:12.8:15.9 delivers a high reversible capacity of 671.8 mAh g(-1) and simultaneously shows excellent cyclability, which can be attributed to the optimal morphology structure and Sn:Co:Sb ratio. The optimized alloy can maintain a high capacity without sacrificing cyclability, which was usually limited by strain accumulation caused by high capacity. This work reports a general gradient electrodeposition technology for high-throughput screening of alloy anodes, which can also be applied to other alloy applications. (C) 2020 Elsevier Ltd. All rights reserved.
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