材料科学
假电容
假电容器
正交晶系
插层(化学)
纳米棒
锂(药物)
化学工程
超级电容器
氢气储存
兴奋剂
纳米技术
无机化学
电化学
结晶学
晶体结构
化学
光电子学
物理化学
合金
复合材料
电极
医学
内分泌学
工程类
作者
Guangyin Liu,Shanshan Liu,Hao Chen,Xiaodi Liu,Xinwei Luo,Xiu Li,Jianmin Ma
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (32): 11710-11718
被引量:2
摘要
Orthorhombic Nb2O5 (T-Nb2O5), a typical intercalation pseudocapacitor, is favorable for realizing high power and energy density for lithium-ion batteries; furthermore, the 2D layered channels perpendicular to the [001] direction facilitate fast Li+ intercalation in T-Nb2O5. Herein, N-doped T-Nb2O5 microflowers (N-Nb2O5) assembled from highly [001]-oriented nanoflakes are rationally synthesized using NH4F as the nitrogen source and capping agent. It is found that NH4+ can adsorb on the O-terminated (010) plane of T-Nb2O5via N-H⋯O hydrogen bonds, which is highly conducive to the generation of 1D nanorods and the subsequent fusion of the nanorods into highly [001]-oriented nanoflakes. The special growth orientation of the T-Nb2O5 nanoflakes endows them with abundant available Li+ intercalation channels; moreover, the bandgap of N-Nb2O5 is narrowed (∼2.91 eV) owing to the doping of N atoms, and the intrinsic electronic conductivity is improved. Accordingly, the intercalation pseudocapacitive behavior of N-Nb2O5 is notably promoted and N-Nb2O5 exhibits superior Li+ storage properties, including large discharge capacity (214.7 mA h g-1 at 1C), excellent rate capability (203.7 and 174.6 mA h g-1 at 1 and 20C), and superior cyclic stability (150.7 mA h g-1 at 10C after 1000 cycles). In addition, the LiNi0.5Mn0.3Co0.2O2//N-Nb2O5 full cell delivers outstanding Li+ storage performance, especially in terms of long-term cycling (126.2 mA h g-1 at 10C after 3500 cycles).
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