Nanoconfined Carbon-Coated Na3V2(PO4)3 Particles in Mesoporous Carbon Enabling Ultra Long Cycle Life for Sodium-Ion Batteries
Na3V2(PO4)3(denoted as NVP)has been considered as a promising cathode material for room temperature sodium ion batteries(NIB).Nevertheless,NVP suffers from poor rate capability resulting from the low electronic conductivity.Herein,we report the feasibility to approach high rate capability by designing carbon coated NVP nanoparticles confined into highly ordered mesoporous carbon CMK-3 matrix(denoted as NVP@C@CMK-3).The NVP@C@CMK-3 is prepared by a simple nanocasting technique.The electrode exhibits superior rate capability and ultralong cyclability(78 mAhg-1 at 5C after 2000 cycles)compares to carbon coated NVP and pure NVP cathode.The improved electrochemical performance is attributed to double carbon coating design that combines a variety of advantages: very short diffusion length of Na+/e-in NVP,easy access of electrolyte and short transport path of Na+ through carbon toward the NVP nanoparticle,high conductivity transport of electrons through the 3D interconnected channels of carbon host.The optimum design of the core-shell nanostructures with double carbon coating permits fast kinetics for both transported Na+ ions and electrons,enabling high-power performance.
Na3V2(PO4)3 mesoporous ultralong cycle life double carbon-coating sodium ion batteries
Yu Jiang Zhenzhong Yang Weihan Li Linchao Zeng Fusen Pan Min Wang Xiang Wei Guantai Hu Lin Gu Yan Yu
Key Laboratory of Materials for Energy Conversion,Chinese Academy of Sciences,Department of Material Beijing Laboratory for Electron Microscopy,Institute of Physics,Chinese Academy of Sciences(CAS),Bei
国内会议
上海
英文
1-22
2016-11-04（万方平台首次上网日期，不代表论文的发表时间）