Combining XAS with XRD for elucidating the complex structural behavior of pre-lithiated SnO anode materials for Lithium-ion batteries
Radiation Physics and Chemistry(2023)
摘要
Tin-based oxides anode materials have been widely studied to aim at higher performance for next-generation lithium-ion batteries (LIBs) due to the high theoretical specific capacity of Sn (reaching 994 mAh.g(-1)). However, the volume variation of Sn/LixSn transformation changes during the lithiation prevents a common application of these materials in nowadays used batteries. To understand the lithiation pathways, in this work, the degree of pre-lithiation of tin-base anode materials was investigated via combined X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) techniques. The experimental results confirm the formation of LiSn, Li7Sn3, Li5Sn2, Li13Sn5, Li7Sn2, and Li22Sn5 phases. The degree of pre-lithiation plays a critical role in determining the electrochemical characteristics of LixSn alloy. This work provided useful and new insights in the future development of advanced anode materials for LIBs.
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关键词
Sn-based materials,Tin monoxide (SnO),Tin dioxide (SnO2),LixSn compound,Hydrothermal method,Pre-lithiation,Li-ion batteries,X-ray absorption spectroscopy (XAS)
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