Abstract
Vanadium oxide nanorolls have for the first time been successfully used as cathode material in a rechargeable lithium battery. The rolls consist of vanadium oxide sheets arranged in a scroll-like manner. The layers are separated by structure directing templates ~e.g., primary amines! which can be readily exchanged by various metal cations without destroying the tubular structure. X-ray diffraction ~XRD! and transmission electron microscopy were used to investigate the morphology and structure of the rolls. Performance as an electrode material was tested by galvanostatic cycling in the potential range 1.8-3.5 V ~vs. Li/Li 1 ! .T he capacities were found to be closely dependent on the type of lithium salt used in the electrolyte. Three salts were tested, LiBF 4, LiPF6, and LiN~CF3SO2!2. The imide salt, LiN~CF3SO2!2, proved to give the best result with initial capacities .200 mAh/g. The material cycled reversibly for at least 100 cycles. XRD results indicate that the tubular structure is preserved, even after prolonged cycling.
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