Nanocomposite Li3V2(PO4)3/carbon as a cathode material with high rate performance and long-term cycling stability in lithium-ion batteries

• Main Authors: Xiong, Peixun, Zeng, Lingxing, Li, Huan, Zheng, Cheng, Wei, Mingdeng
• Format: Article
• Language: English
• ISSN: 2046-2069
• DOI: 10.1039/c5ra08779a

In the present work, nanocomposite Li 3 V 2 (PO 4 ) 3 /carbon is successfully synthesized by combining a sol-gel method and a nanocasting route, and then it is characterized by means of X-ray diffraction (XRD), thermogravimetric analysis (TG), N 2 adsorption-desorption, and transmission electron microscopy (TEM). Furthermore, this nanocomposite is used as a cathode material for Li-ion intercalation and exhibits large reversible capacity, high rate performance and excellent long-term cycling stability. For instance, a large reversible capacity of 95 mA h g −1 and an average Coulombic efficiency of 99.1% can be maintained even after 3000 cycles at a high rate of 20C in the potential range of 3.0-4.3 V. Moreover, the Li 3 V 2 (PO 4 ) 3 /C nanocomposite delivered a large capacity of 127 mA h g −1 at a high rate of 10C in the voltage range of 3.0-4.8 V. The super results might be attributed to the unique hierarchical architecture of the Li 3 V 2 (PO 4 ) 3 /carbon nanocomposite. Li 3 V 2 (PO 4 ) 3 /carbon nanocomposite with high electrochemical performance has been successfully synthesized by combining sol-gel method and nanocasting route.