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以五氧化二钒粉末和碳气凝胶为原材料,结合溶胶凝胶法与水热法制备出具有纳米薄片结构的锂电池正极材料VOx。碳气凝胶通过超临界干燥和二次碳化法制得。由拉曼光谱和X射线衍射图谱表征得知,VOx纳米薄片主要由V3O7·H2O构成,这种物质可以理解为由V2O5和VO_2部分组成。从扫描电子显微镜的结果可以看出,均匀的V3O7·H2O材料由长度超过20μm、宽度近2μm的纳米薄片构成。进一步对这种材料进行了循环伏安测试和100次的恒流充放电测试。这一系列的电化学测试证明了这种材料具有很好的充放电循环稳定性,并且在高达12.8A·g-1的电流密度下仍然具有出色的倍率性能。
The vanadium pentoxide powder and carbon airgel as raw materials, combined with the sol-gel method and hydrothermal method to prepare a nanosheet structure of lithium battery cathode material VOx. Carbon aerogels are produced by supercritical drying and secondary carbonization. Characterized by Raman and X-ray diffraction patterns, VOx nanoflakes are mainly composed of V3O7 · H2O, which can be understood as consisting of V2O5 and VO_2. As can be seen from the results of the scanning electron microscope, the uniform V3O7 · H2O material consists of nanosheets with lengths of more than 20 μm and widths of nearly 2 μm. The material was further cyclic voltammetry and 100 times the constant current charge and discharge test. This series of electrochemical tests demonstrates that this material has good charge-discharge cycle stability and still exhibits excellent rate performance at current densities up to 12.8A · g-1.