X-ray Diffraction, 7Li MAS NMR Spectroscopy, and 119Sn Mössbauer Spectroscopy Study of SnSb-Based Electrode Materials
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- 作者：Francisco J. Ferná ; ndez-Madrigal ; Pedro Lavela ; Carlos Pé ; rez Vicente ; José ; L. Tirado ; Jean Claude Jumas ; and Josette Olivier-Fourcade
- 刊名：Chemistry of Materials
- 出版年：2002
- 出版时间：July 2002
- 年：2002
- 卷：14
- 期：7
- 页码：2962 - 2968
- 全文大小：109K
- 年卷期：v.14,no.7(July 2002)
- ISSN：1520-5002
文摘
119Sn Mössbauer spectroscopy is used in combination with 7Li MAS NMR spectroscopyand X-ray diffraction to resolve the details of the different Li-Sn and Li-Sb intermetallicsformed during the electrochemical reactions of nominal "SnSb" compounds inside a lithiumbattery. At a Li/SnSb ratio of 2.02, the Mössbauer spectrum indicates that the initial structureof the compounds are not deeply affected during the first steps of discharging. At 4.95 Li/SnSb, each spectrum consists of three components. The hyperfine parameters agree wellwith those of 
-Sn and a LiSn-related solid. At 7.27 Li/SnSb, the spectra reveal that nometallic Sn is present. During cell charging, the appearance of a poorly crystalline Li13Sn5phase is detected at 8.9 Li/SnSb. NMR data show signals resulting from ionic Li of thepassivating layer and from Li-Sn and Li-Sb intermetallics at downfield and upfield shifts,respectively, which depart from those observed in bulk solids. The partial recovery of thestistaite structure at the end of charging is confirmed in SnSb single-phase electrodes,whereas the opposite is true for mixtures of tin and antimony.
-Sn and a LiSn-related solid. At 7.27 Li/SnSb, the spectra reveal that nometallic Sn is present. During cell charging, the appearance of a poorly crystalline Li13Sn5phase is detected at 8.9 Li/SnSb. NMR data show signals resulting from ionic Li of thepassivating layer and from Li-Sn and Li-Sb intermetallics at downfield and upfield shifts,respectively, which depart from those observed in bulk solids. The partial recovery of thestistaite structure at the end of charging is confirmed in SnSb single-phase electrodes,whereas the opposite is true for mixtures of tin and antimony.