Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·733-742
·
IF 5.693
Huang Jinping,Chen Qing,Chen Shuaifeng,Luo Lijie,Li Jianbao,Lin Chunfu,Chen Yongjun
FeNb 11 O 29 has a high theoretical capacity as a potential anode material for lithium-ion batteries; however, the practical capacity of FeNb 11 O 29 reported was unsatisfactory. In this study, a simple and efficient Al 3+ -doping technique was demonstrated to improve the electrochemical performance of FeNb 11 O 29 successfully. The influences of the Al 3+ doping amount were investigated. It was found that the crystal structure of FeNb 11 O 29 could be preserved when a suitable amount of Al 3+ was added, and that Al 0.2 Fe 0.8 Nb 11 O 29 demonstrated better electrochemical performance than FeNb 11 O 29 because the structure of Al 0.2 Fe 0.8 Nb 11 O 29 is more stable. At 0.1C, Al 0.2 Fe 0.8 Nb 11 O 29 possessed a high reversible capacity of 318 mAh g −1 with an initial-cycle Coulombic efficiency of 95.0%. Al 0.2 Fe 0.8 Nb 11 O 29 exhibited outstanding cycling stability with capacity retention of 92.9% at 10C over after 1000 cycles. Moreover, A LiFePO 4 /Al 0.2 Fe 0.8 Nb 11 O 29 full cell was prepared successfully with a discharge capacity of 206 mAh g −1 . The full cell exhibited good cycling stability showing the capacity retention of 84.2% over after 200 cycles at 1C and 89.8% over after 1000 cycles at 5C, respectively. This work suggests that Al 0.2 Fe 0.8 Nb 11 O 29 has great application prospects in lithium-ion batteries. Graphical abstract A suitable amount of Al 3+ doping in FeNb 11 O 29 significantly improves the electrochemical performance (especially the reversible capacity) of FeNb 11 O 29 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xiaoming Lou,Zhihao Xu,Zhibin Luo,Chunfu Lin,Chao Yang,Hua Zhao,Peng Zheng,Jianbao Li,Ning Wang,Yongjun Chen,Hui Wu
The recently explored FeNb 11 O 29 is an advanced anode material for lithium-ion batteries due to its large specific capacity and high safety. However, its poor electronic conductivity significantly limits its rate capability. To tackle this issue, a Cr 3+ doping is employed, and Cr x Fe 1- x Nb 11 O 29 ( x = 0 and 0.2) materials were fabricated using a solid-state reaction. X-ray diffraction analyses combined with Rietveld refinements demonstrate that the Cr 3+ doping does not destroy the orthorhombic shear ReO 3 crystal structure ( Amma space group) of FeNb 11 O 29 or obviously change the unit cell volume. Scanning electron microscopy images combined with specific surface area tests reveal the similar particle size after the Cr 3+ doping. Due to the free 3 d electrons in the Cr 3+ ions, the electronic conductivity of Cr 0.2 Fe 0.8 Nb 11 O 29 is enhanced by three orders of magnitude comparing with FeNb 11 O 29 . Consequently, Cr 0.2 Fe 0.8 Nb 11 O 29 exhibits improved electrochemical properties. At 0.1C, it delivers a large reversible capacity of 254 mAh g −1 . At 10C, it still provides a large capacity of 123 mAh g −1 with large retention of 86.9% after 500 cycles. In contrast, FeNb 11 O 29 shows a small capacity of 57 mAh g −1 and small retention of 41.6%. These results reveal that Cr 0.2 Fe 0.8 Nb 11 O 29 can be a promising anode material for high-performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Runtian Zheng,Shangshu Qian,Xing Cheng,Haoxiang Yu,Na Peng,Tingting Liu,Jundong Zhang,Maoting Xia,Haojie Zhu,Jie Shu
Due to high capacity from multiple redox couples, niobium-based oxides are promising anode materials for lithium-ion batteries (LIBs). However, their poor electronic conductivity restricts their electrochemical performance. Here, we report the FeNb 11 O 29 nanotubes as an advanced anode material. FeNb 11 O 29 nanotubes exhibit an impressive charge capacity of 272.64 mAh g −1 with high initial cycle Coulombic efficiency of 90.13% at 0.1 C and outstanding cyclic stability (only 0.0123% of capacity decay per cycle during 2000 cycles). Furthermore, according to the in-situ XRD , the behavior of lithium atoms distribution in the FeNb 11 O 29 framework during the insertion and extraction is studied in detail. In addition, full cells are assembled with commercially available cathodes. Coupled with LiFePO 4 , which is used as cathode, the full cell displays good electrochemical performance. In summary, FeNb 11 O 29 nanotubes can be used as an ideal anode material due to the excellent electrochemical performance.
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 4
·期 12
·3171-3180
·
IF 4.136
Xiaoming Lou,Chunfu Lin,Qiang Luo,Jinbo Zhao,Bin Wang,Jianbao Li,Qian Shao,Xingkui Guo,Ning Wang,Zhanhu Guo
Graphical Driving success : Oxygen-deficient FeNb 11 O 29 exhibits superior properties in terms of increased electronic conductivity, enhanced Li + -ion diffusion coefficient, significant pseudocapacitive behavior, high reversible capacity, safe working potential, advanced first-cycle coulombic efficiency, outstanding rate capability, and good cyclic stability. Therefore, it may be a promising anode material for high-performance lithium-ion batteries in electric vehicles. The recently explored FeNb 11 O 29 is an advanced anode material for lithium-ion batteries, owing to its high specific capacity and safety. However, it suffers from poor rate capability. To tackle this issue, a crystal structure modification is employed. Defective FeNb 11 O 29 (FeNb 11 O 27.9 ) is fabricated by using a one-step solid-state reaction method in N 2 . FeNb 11 O 27.9 has the same orthorhombic shear ReO 3 crystal structure ( Amma space group) as FeNb 11 O 29 , but a larger unit-cell volume and 3.8 % O 2− vacancies (vs. all O 2− ions), which improve the Li + -ion diffusion coefficient by a factor of 88.3 %. The contained Nb 4+ ions with free 4 d electrons significantly increase the electronic conductivity by three orders of magnitude. Consequently, FeNb 11 O 27.9 shows improved pseudocapacitive behavior and electrochemical properties. In comparison with FeNb 11 O 29 , FeNb 11 O 27.9 exhibits a higher reversible capacity of 270 mAh g −1 with a higher first-cycle coulombic efficiency of 90.6 % at 0.1 C. At 10 C, FeNb 11 O 27.9 still retains a high capacity of 145 mAh g −1 with low capacity loss of 6.9 % after 200 cycles, in contrast to the values of 99 mAh g −1 and 11.1 % obtained for FeNb 11 O 29 .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）