A hierarchical structure of Carbon-coated Li3VO4 nanoparticles embedded in Expanded Graphite for hig

• 作 者: Shuang Hu Yan-fang Song Shou-yi Yuan Cong-xiao Wang Yong-gang Wang Yong-yao Xia
• 机 构: Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,
• 出 处: 第十八次全国电化学大会
• 发表日期: 2015年7期

An idiosyncratic hierarchical structure of carbon-coated Li3VO4 nanoparticles homogeneously embedded in expanded graphite was successfully synthesized by a facile and scalable sol-gel method.In the constructed architecture.the super high electronic conductivity of expanded graphite served as a loading carrier.enabling the fast transmission of electronics.The thin outside carbon shells can avoid the direct exposure of Li3VO4 to the electrolyte and mitigate unwanted interfacial side reactions between the electrode materials and liquid electrolytes.Additionally,the nanostructures shorten both of the electrons and Li+diffusion paths significantly.As these synergetic consequences.the novel hybrid material exhibits an impressive reversible gravimetric capacity of 405 mAh g-1 with an acceptable first cycle irreversible loss of 28 ％.as well as exceptional rate capability and cycling stability.Specifically,it is providing 61 ％of the capacity maintenance at 6400 mA g-1(vs 100 mA g-1),demonstrating a capacity retention of 95 ％after 200 cycles at 400 mA g-1,and sustaining excess of thousands cycles at elevated current density of 2000 mA g-1 with diminutive capacity decay of 0.012 ％per cycle,indicating the promise for application as a lithium ion anode.