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In‐Plane Assembled Single‐Crystalline T‐Nb2O5 Nanorods Derived from Few‐Layered Nb2CTx MXene Nanosheets for Advanced Li‐Ion Capacitors
Small Methods ( IF 10.7 ) Pub Date : 2020-10-08 , DOI: 10.1002/smtd.202000630 Li Qin 1 , Yang Liu 1 , Senyang Xu 1 , Shichao Wang 1 , Xuan Sun 1 , Shuhao Zhu 1 , Linrui Hou 1 , Changzhou Yuan 1
Small Methods ( IF 10.7 ) Pub Date : 2020-10-08 , DOI: 10.1002/smtd.202000630 Li Qin 1 , Yang Liu 1 , Senyang Xu 1 , Shichao Wang 1 , Xuan Sun 1 , Shuhao Zhu 1 , Linrui Hou 1 , Changzhou Yuan 1
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Lithium‐ion capacitors (LICs) have attracted enormous interest thanks to their competitive power/energy densities and long‐duration lifespan. However, the sluggish insertion kinetics of battery‐type anodes seriously limits comprehensive performance of LICs. It is therefore imperative yet significant to develop advanced anodes with high‐rate Li+ intercalation. Herein, first the in‐plane assembled single‐crystalline orthorhombic Nb2O5 nanorods (T‐Nb2O5 NRs) are designed and constructed via efficient hydrothermal and subsequent annealing treatment by employing few‐layered Nb2CTx nanosheets as a niobium‐based precursor. The inherent formation mechanism of single‐crystalline T‐Nb2O5 NRs is tentatively proposed. When evaluated as anode material for LICs, the T‐Nb2O5 NRs are endowed with robust crystalline skeletons and high diffusion dynamics benefiting from their appealing structure merits, and they exhibit a high‐rate capacity of ≈147 mAh g−1 at 2.0 A g−1. The lithium storage process of the resultant single‐crystalline T‐Nb2O5 is unveiled as well with in situ X‐ray diffraction analysis. Furthermore, the T‐Nb2O5 NR‐based LICs display a large energy density of ≈35.6 Wh kg−1 at 8 kW kg−1, along with exceptional capacity retention of ≈95% over 4000 cycles at 0.5 A g−1. More significantly, the devised synthetic methodology and in‐depth insights here will stimulate extensive development of single‐crystalline T‐Nb2O5 NRs for next‐generation LICs and beyond.
中文翻译：
平面叠层单晶体T-Nb2O5纳米棒，源自少量层状Nb2CTx MXene纳米片，用于先进的锂离子电容器
锂离子电容器（LIC）由于具有竞争力的功率/能量密度和较长的使用寿命而引起了人们的极大兴趣。但是，电池型阳极的缓慢插入动力学严重限制了LIC的综合性能。因此，开发具有高Li +嵌入率的高级阳极势在必行，但意义重大。在此，首先通过有效的水热设计和构造面内组装的单晶正交Nb 2 O 5纳米棒（T-Nb 2 O 5 NRs），然后采用几层Nb 2 CT x进行退火处理。纳米片作为基于铌的前体。初步提出了单晶T-Nb 2 O 5 NR的内在形成机理。当用作低收入国家阳极材料进行评价，该T形的Nb 2 ö 5 NRs的赋有鲁棒结晶骨架和高扩散动力学从它们的吸引人的结构的优点中受益，并且它们表现出的高速率容量≈ 147毫安克-1在2.0 A g -1。还通过原位X射线衍射分析揭示了所得单晶T-Nb 2 O 5的锂存储过程。此外，T-Nb 2 O 5基于NR-低收入国家显示的大的能量密度≈ 35.6瓦千克-1在8千瓦千克-1，具有优异的容量保持沿≈超过4000个循环的0.5 A克95％-1。更重要的是，这里设计的合成方法和深入的见识将刺激单晶T-Nb 2 O 5 NRs广泛用于下一代LICs及其以后。
更新日期：2020-12-03
中文翻译：
平面叠层单晶体T-Nb2O5纳米棒，源自少量层状Nb2CTx MXene纳米片，用于先进的锂离子电容器
锂离子电容器（LIC）由于具有竞争力的功率/能量密度和较长的使用寿命而引起了人们的极大兴趣。但是，电池型阳极的缓慢插入动力学严重限制了LIC的综合性能。因此，开发具有高Li +嵌入率的高级阳极势在必行，但意义重大。在此，首先通过有效的水热设计和构造面内组装的单晶正交Nb 2 O 5纳米棒（T-Nb 2 O 5 NRs），然后采用几层Nb 2 CT x进行退火处理。纳米片作为基于铌的前体。初步提出了单晶T-Nb 2 O 5 NR的内在形成机理。当用作低收入国家阳极材料进行评价，该T形的Nb 2 ö 5 NRs的赋有鲁棒结晶骨架和高扩散动力学从它们的吸引人的结构的优点中受益，并且它们表现出的高速率容量≈ 147毫安克-1在2.0 A g -1。还通过原位X射线衍射分析揭示了所得单晶T-Nb 2 O 5的锂存储过程。此外，T-Nb 2 O 5基于NR-低收入国家显示的大的能量密度≈ 35.6瓦千克-1在8千瓦千克-1，具有优异的容量保持沿≈超过4000个循环的0.5 A克95％-1。更重要的是，这里设计的合成方法和深入的见识将刺激单晶T-Nb 2 O 5 NRs广泛用于下一代LICs及其以后。
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