Using cheap cation exchange resin as the carbon source,iron ions are introduced based on the ion exchange strategy to regulate the graphitized carbon structure during the pyrolysis process of the cation exchange resin.And further acid etched the elemental iron and iron carbide in the pyrolysis product to prepare a mesoporous graphitized carbon for use as anode material for sodium-ion batteries.The cation exchange resin based graphitic carbon shows larger intergraphene spacing,lower defects and mesoporous tunnels constructed by few graphite layers compared with the hard carbon by direct pyrolysis of resin,which could significantly improve the capacity and cycling stability and carbon anode material at high rates.When applied to anode material in sodium ion battery,this material exhibits excellent rate performance and cycling stability at high rates,showing a specific capacity of 100 mA·h·g-1 at a high current density of 30 A·g-1,and a specific capacity of 192 mA·h·g-1 at a current density of 0.5 A·g-1 after 1000 cycles.
关键词
纳米结构/热解/电化学/钠离子电池/石墨化碳
Key words
nanostructure/pyrolysis/electrochemistry/sodium ion battery/graphitic carbon
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