Abstract Monoclinic LiVP 2 O 7 /C was successfully synthesized by the sol–gel method using citric acid as both the carbon source and reducing agent. The structure and morphology of the sample were investigated. TEM image showed that the surface of sample was covered with a thin carbon layer. Charge–discharge testing revealed that the LiVP 2 O 7 /C sample with carbon content of 6.63 wt% prepared at 800 °C exhibited the best initial discharge capacity of 102.3 mAh · g −1 , 96.2% of which was retained after 50 cycles. The experimental results indicate that the sol–gel method and carbon coating not only provide a facile and practical approach, but are beneficial to the electrochemical properties of the LiVP 2 O 7 /C cathode material.

中文翻译：

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新型锂离子电池正极材料LiVP 2 O 7 /C的合成及电化学性能

摘要 以柠檬酸为碳源和还原剂，通过溶胶-凝胶法成功合成了单斜LiVP 2 O 7 /C。对样品的结构和形貌进行了研究。TEM 图像显示样品表面覆盖有薄碳层。充放电测试表明，在800°C下制备的含碳量为6.63 wt%的LiVP 2 O 7 /C样品表现出最佳的初始放电容量为102.3 mAh·g -1 ，其中96.2%在50次循环后保留。实验结果表明，溶胶-凝胶法和碳涂层不仅提供了一种简便实用的方法，而且有利于提高 LiVP 2 O 7 /C 正极材料的电化学性能。