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首页> 外文期刊>Solid state ionics >Ultra-small Na3V2(PO4)(3) nanoparticles decorated MOFs-derived carbon enabling fast charge transfer for high-rate sodium storage
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Ultra-small Na3V2(PO4)(3) nanoparticles decorated MOFs-derived carbon enabling fast charge transfer for high-rate sodium storage

机译:超小型NA3V2(PO4)(3)纳米颗粒装饰了MOFS衍生的碳,使高速钠储存的快速电荷转移

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摘要

Na3V2(PO4)(3) nanoparticles are decorated on MOF (ZIF-67) derived carbon via an impregnation followed by solid-phase sintering method. The ultra-small Na3V2(PO4)(3) (similar to 5 nm) particles and underlying mesoporous carbon framework enable fast charge transportation. A high sodium ion diffusion coefficient of 2.47 x 10(-13) cm(2) s(-1) is achieved as measured by electrochemical impedance spectroscopy (EIS). The electron transfer resistance is also greatly reduced by the incorporation of mesoporous carbon. Therefore, such composite material demonstrates outstanding high rate performance as sodium ion battery cathode. Specifically, a discharge capacity of 84.6 mA h g(-1) is recorded after 5000 cycles at a current density of 20C (1C = 117 mA g(-1)) corresponding to 86.3% of its initial capacity. The capacities still reach 74.5 and 62 mA h g(-1) after 4500 cycles at high current densities of 30C and 50C, with Coulombic efficiency remains over 98%.
机译:Na3v2(PO4)(3)纳米颗粒通过浸渍在MOF(ZIF-67)衍生的碳上装饰,然后通过固相烧结方法。 超小型Na3v2(PO4)(3)(类似于5nm)颗粒和底层的中孔碳框架使得能够快速充电。 通过电化学阻抗谱(EIS)测量,实现了2.47×10(-13)厘米(2)厘米(2)厘米(2)厘米(2)厘米(2)厘米(2)厘米(-1)的高钠离子扩散系数。 通过掺入介孔的碳也大大降低了电子传递电阻。 因此,这种复合材料表明了作为钠离子电池阴极的卓越的高速率性能。 具体地,在20℃的电流密度的5000次循环之后记录84.6mA H(-1)的放电容量(1c = 117mA g(-1)),其初始容量的86.3%。 在30℃和50℃的高电流密度下4500次循环后,容量仍然达到74.5和62 mA H(-1),库仑效率保持超过98%。

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