| AVS 65th International Symposium & Exhibition | |
| Processing and Characterization of Air-Liquid, Solid-Liquid and Air-Solid Interfaces Focus Topic | Tuesday Sessions |
| Session PC+AS+BI+EM+NS+PB+SS-TuP |
| Session: | Processing and Characterization of Gas-Liquid, Solid-Liquid, and Gas-Solid Interfaces |
| Presenter: | Tiffany Kaspar, Pacific Northwest National Laboratory |
| Authors: | T.C. Kaspar, Pacific Northwest National Laboratory T. Varga, Pacific Northwest National Laboratory D.A. Shapiro, Advanced Light Source, Lawrence Berkeley National Laboratory A. Martinez, Pacific Northwest National Laboratory Y. Shin, Pacific Northwest National Laboratory K.S. Han, Pacific Northwest National Laboratory M.-S. Lee, Pacific Northwest National Laboratory S. Thevuthasan, Pacific Northwest National Laboratory V. Murugesan, Pacific Northwest National Laboratory |
| Correspondent: | Click to Email |
Due to their good chemical stability, strong oxidation capability, and desirable lithium electrochemical activity, nanostructured titanium dioxide (TiO2) anode materials have received considerable attention recently. Decreasing the particle size to 10-20 nm can increase the electrochemical capacity to 200-300 mAhg-1. Furthermore, nanostructured TiO2 anodes are non-toxic and would be suitable for cost effective mass production. Among the rutile, anatase, and brookite polymorphs of TiO2, anatase nanoparticles have shown the best Li ion insertion properties and maximum reduction, indicating increased Li ion intercalation into the material. Here, we have synthesized 10-20 nm anatase TiO2 nanoparticles and contacted them with solid Li- bis(trifluoromethanesulfonyl)imide (LiTFSI) as a function of temperature to understand the chemical and structural effects associated with thermally driven solid-solid Li+ transfer to, and intercalation in, TiO2 nanoparticles. We have used a combination of x-ray photoelectron spectroscopy (XPS), Ti L-edge scanning transmission x-ray microscopy (STXM), Raman spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy to gain a fundamental understanding of the structural evolution of TiO2 nanoparticles during Li+ intercalation. Our results indicate that thermally driven solid-solid Li+ transfer to TiO2 has occurred, and altered the TiO2 structure at the edges of the agglomerated nanoparticles.