金属有机骨架衍生的碳化铁/碳制备及其电化学性能
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摘要
采用水热法成功地合成了前驱体,并在氮气条件下煅烧得到氮掺杂的碳化铁/碳立方体。通过XRD、BET、 SEM、TEM对目标产物进行了表征,研究了氮掺杂的碳化铁/碳立方体的微观结构、表面形貌。氮掺杂的碳化铁/碳立方体作为锂离子负极材料的电化学测试表明,在200 m A/g的电流密度下首次可逆容量达到889 m A·h/g,循环200次后,容量保持率为88.1%。同时,电流密度从0.1 A/g增加到5 A/g,容量具有一定的衰减,但恢复到0.1 A/g时,容量几乎维持到原来的水平,表明其具有良好的倍率性能。所以,制备的氮掺杂的碳化铁/碳多孔立方体具有较高的比容量、良好的循环性能和广泛的应用前景。
The precursors were successfully synthesized by hydrothermal method.Then the precursors were calcined under nitrogen to obtain nitrogen-doped Fe_3 C/C cubes.The target product was characterized by XRD,BET,SEM and TEM.The microstructure and surface morphology of nitrogen-doped Fe_3 C/C cubes were studied.The electrochemical tests of the nitrogen-doped Fe_3 C/C cube as the anodes for lithium-ion batteries showed that the reversible capacity of the first cycle reached 889 mA·h/g,and the capacity retention rate was 88.1% at a current density of 200 m A/g after 200 cycles.Meanwhile,when the current density increased from 0.1 A/g to 5 A/g, the capacity had certain attenuation. But restored to 0.1 A/g and almost maintained at its original level,indicating that it had good rate performance.Therefore,the porous N-Fe_3 C/C prepared had high specific capacity,good cycling performance and a wide range of application.
The precursors were successfully synthesized by hydrothermal method.Then the precursors were calcined under nitrogen to obtain nitrogen-doped Fe_3 C/C cubes.The target product was characterized by XRD,BET,SEM and TEM.The microstructure and surface morphology of nitrogen-doped Fe_3 C/C cubes were studied.The electrochemical tests of the nitrogen-doped Fe_3 C/C cube as the anodes for lithium-ion batteries showed that the reversible capacity of the first cycle reached 889 mA·h/g,and the capacity retention rate was 88.1% at a current density of 200 m A/g after 200 cycles.Meanwhile,when the current density increased from 0.1 A/g to 5 A/g, the capacity had certain attenuation. But restored to 0.1 A/g and almost maintained at its original level,indicating that it had good rate performance.Therefore,the porous N-Fe_3 C/C prepared had high specific capacity,good cycling performance and a wide range of application.
引文
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