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We investigate the structural changes of spinel lithium titanate (LTO; Li4Ti5O12) via the electrochemical Na insertion-extraction cycles, using X-ray diffraction (XRD) and analytical transmission electron microscopy (A-TEM). The XRD reveals that an extra phase with an about 4‑5% larger unit cell volume is generated in pristine LTO during the first cycle. The A-TEM reveals that the extra phase co-exists...
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