5 years ago

Crystal Structure Modification Enhanced FeNb11O29 Anodes for Lithium-Ion Batteries

Crystal Structure Modification Enhanced FeNb11O29 Anodes for Lithium-Ion Batteries
Bin Wang, Qian Shao, Zhanhu Guo, Jinbo Zhao, Qiang Luo, Chunfu Lin, Xiaoming Lou, Ning Wang, Xingkui Guo, Jianbao Li
The recently explored FeNb11O29 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 FeNb11O29 (FeNb11O27.9) is fabricated by using a one-step solid-state reaction method in N2. FeNb11O27.9 has the same orthorhombic shear ReO3 crystal structure (Amma space group) as FeNb11O29, but a larger unit-cell volume and 3.8 % O2− vacancies (vs. all O2− ions), which improve the Li+-ion diffusion coefficient by a factor of 88.3 %. The contained Nb4+ ions with free 4d electrons significantly increase the electronic conductivity by three orders of magnitude. Consequently, FeNb11O27.9 shows improved pseudocapacitive behavior and electrochemical properties. In comparison with FeNb11O29, FeNb11O27.9 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, FeNb11O27.9 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 FeNb11O29. Driving success: Oxygen-deficient FeNb11O29 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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700816

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