Synthesis of Li3V2(PO4)3/reduced graphene oxide cathode material with high-rate capability

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• 作者：Junfang Zhu (1)
  Rongsheng Yang (1)
  Keliang Wu (1)
  
• 关键词：Lithium vanadium phosphate ; Reduced graphene oxide ; Lithium ion battery ; Cathode material ; Monoclinic
• 刊名：Ionics
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：19
• 期：4
• 页码：577-580
• 全文大小：389KB
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• 作者单位：Junfang Zhu (1)
  Rongsheng Yang (1)
  Keliang Wu (1)
  
  1. Department of Petroleum and Chemical, Bayingolin Vocational and Technical College, Xinjiang Uygur Autonomous Region, 841000, China
  
• ISSN：1862-0760

文摘

The Li3V2(PO4)3/reduced graphene oxide (LVP/rGO) composite is successfully synthesized by a conventional solid-state reaction with a high yield of 10聽g, which is suitable for large-scale production. Its structure and physicochemical properties are investigated using X-ray diffraction, Raman spectra, field-emission scanning electron microscopy, transmission electron microscopy, and electrochemical methods. The rGO content is as low as ~3聽wt%, and LVP particles are strongly adhered to the surface of the rGO layer and/or enwrapped into the rGO sheets, which can facilitate the fast charge transfer within the whole electrode and to the current collector. The galvanostatic charge鈥揹ischarge tests show that the LVP/rGO electrode delivers an initial discharge capacity of 177聽mAh g鈭? at 0.5聽C with capacity retention of 88聽% during the 50th cycle in a wide voltage range of 3.0鈥?.8聽V. A superior rate capability is also achieved, e.g., exhibiting discharge capacities of 137 and 117聽mAh g鈭? during the 50th cycle at high C rates of 2 and 5聽C, respectively.