New Anode Material for Lithium-Ion Batteries: Aluminum Niobate (AlNb11O29)

• Published in: ACS applied materials & interfaces Vol. 11; no. 6; pp. 6089 - 6096
• Main Authors: Lou, Xiaoming, Li, Renjie, Zhu, Xiangzhen, Luo, Lijie, Chen, Yongjun, Lin, Chunfu, Li, Hongliang, Zhao, X. S
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 13.02.2019
• Subjects: aluminum; anodes; cathodes; electrochemistry; energy density; lithium; lithium batteries; microparticles; nanowires; X-ray diffraction; aluminum niobate; niobates; lithium-ion batteries; AlNb11O29 nanowires
• ISSN: 1944-8244; 1944-8252; 1944-8252
• DOI: 10.1021/acsami.8b20246

This paper describes the syntheses and electrochemical 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.