Structural anal ysis of SWCNTsduring L i i on i nsert i on by synchrotron X-ay diffraction stud

我们研制了一种用于锂离子充放电过程中同步辐射X射线衍射原位实验的金刚石板窗口电化学电池。使用开发的电池，我们已经研究了单壁碳纳米管（SWCNTs）和二氧化钛电极与锂离子插入/提取的结构变化。研究发现，单壁碳纳米管在电解液中浸泡后，其衍射强度会降低。另一方面，我们可以观察到TiO 2（B）相的XRD图案随着Li含量的增加/减少而变化。通过对XRD图谱的Rietveld分析，阐明了锂离子充放电过程中Ti 02（B）相的结构

We have developed an electrochemical cell having diamond plate windows for the in-situ synchrotron X-ray diffraction experiment during Li-ion charge-discharge processes. Using the developed cell, we have investigated structural changes of singlewalled carbon nanotubes(SWCNTs) and TiO2 electrodes with Li-ion insertion/extraction. It was found that diffractions of SWCNTs lose their intensities just by immersing SWCNTs in electrolyte. On the other hand, we could observe the change in XRD pattern of Ti02(B) phase with increasing/decreasing Li content. The structures of Ti02(B) phase during Li-ion chargedischarge process were elucidated by Rietveld analyses of the obtained XRD patterns