Thermally fabricated cobalt telluride in nitrogen-rich carbon dodecahedra as high-rate potassium and sodium ion battery anodes
Thermally fabricated cobalt telluride in nitrogen-rich carbon dodecahedra as high-rate potassium and sodium ion battery anodes
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热制备富氮碳十二面体碲化钴作为高倍率钾钠离子电池阳极
DOI：
10.1039/d2se00267a
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发表时间：
2022
影响因子：
5.6
通讯作者：
Mitlin, David
中科院分区：
文献类型：
--
作者：
Sarkar, Debasish;Das, Debanjan;Nagarajan, Sudhan;Mitlin, David
采用热解-碲熔体浸渍法制备了富氮碳十二面体上的碲化钴(Cote@NCD)。纯热法不涉及二次化学物质，也不产生废物副产物。其结果是得到了由纳米级86wt%CoTe金属间化合物纳米颗粒组成的微结构，该纳米颗粒包含在一个薄的富N碳基质中。在电化学循环过程中，平均直径为21 nm的Cote为Na+/K+离子提供了短的扩散路径，这些路径与导电碳基质一起允许快速钾化或钠化。作为钾离子电池(PIB和KIB)和钠离子电池(NIB和SIB)的正极，Cote@NCD具有诱人的可逆容量、良好的循环稳定性和最先进的倍率性能。例如，CoTe@NCD电极作为KIB负极，在50 mA g−1时的可逆容量为380 mA h g−1，在1000 mA g−1时的快速充电容量为136 mA h g−1。作为NiB负极，它还表现出优异的倍率性能，在50 mA g−1时达到620 mA h g−1，在1000 mA g−1时达到345 mA g−1。
Cobalt telluride anchored to nitrogen-rich carbon dodecahedra (CoTe@NCD) was synthesized by simultaneous pyrolysis-tellurium melt impregnation of ZIF-67 MOFs. The purely thermal method involved no secondary chemicals and no waste byproducts. The result is a microstructure consisting of nanoscale 86 wt% CoTe intermetallic nanoparticles contained within a thin N-rich carbon matrix. During electrochemical cycling, the 21 nm average diameter CoTe provides short diffusion paths for Na+/K+ ions, which in conjunction with the electrically conducting carbon matrix allow for rapid potassiation or sodiation. As potassium ion battery (PIB and KIB) and sodium ion battery (NIB and SIB) anodes, CoTe@NCD demonstrates attractive reversible capacity, promising cycling stability, and state-of-the-art rate performance. For example, as a KIB anode, the CoTe@NCD electrode exhibits a reversible capacity of 380 mA h g−1 at 50 mA g−1 and a fast charge capacity of 136 mA h g−1 at 1000 mA g−1. As a NIB anode, it also displays excellent rate capability achieving 620 mA h g−1 at 50 mA g−1 and 345 mA h g−1 at 1000 mA g−1.