Synthesis and Characterization of NaAlTi3O8 As a Novel Intercalation Anode Material for Sodium Ion Batteries

Tuesday, 3 October 2017: 16:00
Maryland A (Gaylord National Resort and Convention Center)
X. Ma (Georgia Institute of Technology), J. Bai (Brookhaven National Laboratory), K. An (Oak Ridge National Laboratory), and H. Chen (Georgia Institute of Technology)
Sodium ion batteries are being considered as an alternative to lithium ion batteries in large scale energy storage applications owing to the low cost. A novel titanate compound NaAlTi3Owas successfully synthesized and tested as a promising intercalation anode material for sodium ion batteries. Powder X-ray diffraction (XRD) and refinement were used to analyze the crystal structure. Electrochemical cycling tests under a C/10 rate between 0.01-2.5 V showed that ~83 mAh/g capacity can be achieved in the second cycle, with ~75% of which retained after 100 cycles, which corresponds to 0.75 Na+ insertion and extraction per formula unit. The influence of synthesis conditions on electrochemical performances was investigated and discussed. NaAlTi3O8 not only presents a new anode material with low average voltage of ~0.5 V, but also provides a new type of intercalation anode with a crystal structure that differentiates from previously reported intercalation anode materials.