期刊
ACS NANO
卷 6, 期 6, 页码 5465-5473出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn301339g
关键词
Li-ion batteries; silicon nanowires; in situ X-ray diffraction; (de)lithiation mechanism; phase evolution; electrochemical performance
类别
资金
- Department of Energy, Laboratory Directed Research and Development [DE-AC02-76SF00515]
- King Abdullah University of Science and Technology (KAUST) [KUS-I1-001-12]
Silicon is a promising anode material for Li-ion batteries due to its high theoretical specific capacity. From previous work, silicon nanowires (SiNWs) are known to undergo amorphorization during lithiation, and no crystalline Li-Si product has been observed. In this work, we use an X-ray transparent battery cell to perform in situ synchrotron X-ray diffraction on SiNWs in real time during electrochemical cycling. At deep lithiation voltages the known metastable Li15Si4 phase forms, and we show that avoiding the formation of this phase, by modifying the SiNW growth temperature, improves the cycling performance of SiNW anodes. Our results provide insight on the (de)lithiation mechanism and a correlation between phase evolution and electrochemical performance for SiNW anodes.
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