期刊
JOURNAL OF POWER SOURCES
卷 329, 期 -, 页码 323-329出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.08.089
关键词
Si/graphite composites; Hard carbon coating; Cycling performance; Rate capability; Lithium ion batteries
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, Advanced Battery Materials Research (BMR) programs of theU.S. Department of Energy (DOE) [DE-AC02-05CH11231, 18769]
- DOE's Office of Biological and Environmental Research at Pacific Northwest National Laboratory (PNNL)
- DOE [DE-AC05-76RLO1830]
With the ever-increasing demands for higher energy densities in Li-ion batteries, alternative anodes with higher reversible capacity are required to replace the conventional graphite anode. Here, we demonstrate a cost-effective hydrothermal carbonization approach to prepare a hard carbon coated nano-Si/graphite (HC-nSi/G) composite as a high performance anode for Li-ion batteries. In this hierarchical structured composite, the hard carbon coating not only provides an efficient pathway for electron transfer, but also alleviates the volume variation of Si during charge/discharge processes. The HC-nSi/G composite electrode shows excellent performance, including a high specific capacity of 878.6 mAh g(-1) based on the total weight of composite, good rate performance, and a decent cycling stability, which is, promising for practical applications. (C) 2016 Elsevier B.V. All rights reserved.
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