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Hierarchical Co3O4@N-Doped Carbon Composite as an Advanced Anode Material for Ultrastable Potassium Storage.
ACS Nano ( IF 15.8 ) Pub Date : 2020-03-20 , DOI: 10.1021/acsnano.0c01395 David Adekoya 1 , Hao Chen 1 , Hui Ying Hoh 1 , Tim Gould 1 , M-Sadeeq Jie Tang Balogun 2 , Chao Lai 1, 3 , Huijun Zhao 1 , Shanqing Zhang 1
ACS Nano ( IF 15.8 ) Pub Date : 2020-03-20 , DOI: 10.1021/acsnano.0c01395 David Adekoya 1 , Hao Chen 1 , Hui Ying Hoh 1 , Tim Gould 1 , M-Sadeeq Jie Tang Balogun 2 , Chao Lai 1, 3 , Huijun Zhao 1 , Shanqing Zhang 1
Affiliation
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Cobalt oxide (Co3O4) delivers a poor capacity when applied in large-sized alkali metal-ion systems such as potassium-ion batteries (KIBs). Our density functional theory calculation suggests that this is due to poor conductivity, high diffusion barrier, and weak potassium interaction. N-doped carbon can effectively attract potassium ions, improve conductivity, and reduce diffusion barriers. Through interface engineering, the properties of Co3O4 can be tuned via composite design. Herein, a Co3O4@N-doped carbon composite was designed as an advanced anode for KIBs. Due to the interfacial design of the composite, K+ were effectively transported through the Co3O4@N-C composite via multiple ionic pathways. The structural design of the composite facilitated increased Co3O4 spacing, a nitrogen-doped carbon layer reduced K-ion diffusion barrier, and improved conductivity and protected the electrode from damage. Based on the entire composite, a superior capacity of 448.7 mAh/g was delivered at 50 mA/g after 40 cycles, and moreover, 213 mAh/g was retained after 740 cycles when cycled at 500 mA/g. This performance exceeds that of most metal-oxide-based KIB anodes reported in literature.
中文翻译：
分层Co3O4 @ N掺杂碳复合材料作为用于超稳定钾储存的高级阳极材料。
当应用于大型碱金属离子系统（如钾离子电池（KIB））时，氧化钴（Co3O4）的容量较差。我们的密度泛函理论计算表明，这是由于电导率低，扩散势垒高和钾相互作用弱所致。掺氮碳可以有效地吸引钾离子，提高电导率并减少扩散壁垒。通过界面工程，可以通过复合设计来调整Co3O4的性能。在此，设计了一种掺杂Co3O4 @ N的碳复合材料作为KIB的高级阳极。由于复合材料的界面设计，K +通过多种离子途径有效地通过了Co3O4 @ NC复合材料。复合材料的结构设计促进了Co3O4间距的增加，氮掺杂的碳层减少了K离子的扩散势垒，并改善了导电性并保护了电极不受损坏。以整个复合材料为基准，在40个循环后以50 mA / g可以提供448.7 mAh / g的超强容量，而且在以500 mA / g循环740个循环后可以保留213 mAh / g。该性能超过文献报道的大多数基于金属氧化物的KIB阳极。
更新日期：2020-03-20
中文翻译：
分层Co3O4 @ N掺杂碳复合材料作为用于超稳定钾储存的高级阳极材料。
当应用于大型碱金属离子系统（如钾离子电池（KIB））时，氧化钴（Co3O4）的容量较差。我们的密度泛函理论计算表明，这是由于电导率低，扩散势垒高和钾相互作用弱所致。掺氮碳可以有效地吸引钾离子，提高电导率并减少扩散壁垒。通过界面工程，可以通过复合设计来调整Co3O4的性能。在此，设计了一种掺杂Co3O4 @ N的碳复合材料作为KIB的高级阳极。由于复合材料的界面设计，K +通过多种离子途径有效地通过了Co3O4 @ NC复合材料。复合材料的结构设计促进了Co3O4间距的增加，氮掺杂的碳层减少了K离子的扩散势垒，并改善了导电性并保护了电极不受损坏。以整个复合材料为基准，在40个循环后以50 mA / g可以提供448.7 mAh / g的超强容量，而且在以500 mA / g循环740个循环后可以保留213 mAh / g。该性能超过文献报道的大多数基于金属氧化物的KIB阳极。
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