New Anode Material for Lithium-Ion Batteries: Aluminum Niobate (AlNb11O29)
New Anode Material for Lithium-Ion Batteries: Aluminum Niobate (AlNb11O29)
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锂离子电池新型负极材料：铌酸铝（AlNb11O29）
DOI：
10.1021/acsami.8b20246
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发表时间：
2019-02-13
影响因子：
9.5
通讯作者：
Zhao, X. S.
中科院分区：
文献类型：
--
作者：
Lou, Xiaoming;Li, Renjie;Zhao, X. S.
本文介绍了一种新型铌酸盐化合物铌酸铝（AlNb11O29）的合成及其电化学性能。采用固相法和溶剂热法分别合成了alnb11o29微颗粒和纳米线。原位x射线衍射结果证实了Li+在AlNb11O29中的插层机制，揭示了其高的抗循环结构稳定性。AlNb11O29纳米线具有新颖的竹状形貌，具有较大的界面面积和较短的电荷传输路径，因此具有优异的电化学性能，包括高可逆Li+存储容量（266 mA h g(-1)），安全的工作电位（约1.68 V），以及0.1 C时的高初始库仑效率（93.3%）。在非常高的速率（10 C）下，AlNb11O29纳米线的容量仍然高达192 mA h g（-1）。表明它们具有良好的速率能力。此外，在10℃下，经过500次循环，其容量仍保持96.3%，表明具有优异的循环稳定性。以AlNb11O29纳米线为阳极，LiNi0.5Mn1.5O4微粒子为阴极制备的全电池在0.1℃下可提供390 W h kg（-1）的高能量密度。这项工作表明，AlNb11O29纳米线在大规模储能应用的高性能锂离子电池的发展中具有很大的前景。
This paper describes the syntheses and electro-chemical properties of a new niobate compound, aluminum niobate (AlNb11O29), for Li+ storage. AlNb11O29-microsized particles and nanowires were synthesized based on the solid-state reaction and solvothermal methods, respectively. In situ X-ray diffraction results confirmed the intercalating mechanism of Li+ in AlNb11O29 and revealed its high structural stability against cycling. The AlNb11O29 nanowires with a novel bamboo-like morphology afforded a large interfacial area and short charge transport pathways, thus leading to the observed excellent electrochemical properties, including high reversible Li+-storage capacity (266 mA h g(-1)), safe operating potential (around 1.68 V), and high initial Coulombic efficiency (93.3%) at 0.1 C. At a very high rate (10 C), the AlNb11O29 nanowires still exhibited a capacity as high as 192 mA h g(-1), indicating their good rate capability. In addition, at 10 C, 96.3% capacity was retained over 500 cycles, indicating superior cycling stability. A full cell fabricated with AlNb11O29 nanowires as the anode and LiNi0.5Mn1.5O4 microparticles as the cathode delivered a high energy density of 390 W h kg(-1) at 0.1 C. This work suggests that the AlNb11O29 nanowires hold a great promise for the development of high-performance lithium-ion batteries for large-scale energy-storage applications.