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    University - Student Department: Chemistry Position: Graduate

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  • Mail Code: 5080

All Publications

  • Confined Interlayer Water Promotes Structural Stability for High-Rate Electrochemical Proton Intercalation in Tungsten Oxide Hydrates ACS ENERGY LETTERS Mitchell, J. B., Geise, N. R., Paterson, A. R., Osti, N. C., Sun, Y., Fleischmann, S., Zhang, R., Madsen, L. A., Toney, M. F., Jiang, D., Kolesnikov, A., Mamontov, E., Augustyn, V. 2019; 4 (12): 2805–12

    View details for DOI 10.1021/acsenergylett.9b02040

    View details for Web of Science ID 000503114500006

  • Analysis and Simulation of One-Dimensional Transport Models for Lithium Symmetric Cells Subramaniam, A., Chen, J., Jang, T., Geise, N. R., Kasse, R. M., Toney, M. F., Subramanian, V. R. ELECTROCHEMICAL SOC INC. 2019: A3806–A3819

    View details for DOI 10.1149/2.0261915jes

    View details for Web of Science ID 000497144100001

  • Novel ALD Chemistry Enabled Low-Temperature Synthesis of Lithium Fluoride Coatings for Durable Lithium Anodes ACS APPLIED MATERIALS & INTERFACES Chen, L., Chen, K., Chen, X., Ramirez, G., Huang, Z., Geise, N. R., Steinruck, H., Fisher, B. L., Shahbazian-Yassar, R., Toney, M. F., Hersam, M. C., Elam, J. W. 2018; 10 (32): 26972–81

    Abstract

    Lithium metal anodes can largely enhance the energy density of rechargeable batteries because of the high theoretical capacity and the high negative potential. However, the problem of lithium dendrite formation and low Coulombic efficiency (CE) during electrochemical cycling must be solved before lithium anodes can be widely deployed. Herein, a new atomic layer deposition (ALD) chemistry to realize the low-temperature synthesis of homogeneous and stoichiometric lithium fluoride (LiF) is reported, which then for the first time, as far as we know, is deposited directly onto lithium metal. The LiF preparation is performed at 150 °C yielding 0.8 Å/cycle. The LiF films are found to be crystalline, highly conformal, and stoichiometric with purity levels >99%. Nanoindentation measurements demonstrate the LiF achieving a shear modulus of 58 GPa, 7 times higher than the sufficient value to resist lithium dendrites. When used as the protective coating on lithium, it enables a stable Coulombic efficiency as high as 99.5% for over 170 cycles, about 4 times longer than that of bare lithium anodes. The remarkable battery performance is attributed to the nanosized LiF that serves two critical functions simultaneously: (1) the high dielectric value creates a uniform current distribution for excellent lithium stripping/plating and ultrahigh mechanical strength to suppress lithium dendrites; (2) the great stability and electrolyte isolation by the pure LiF on lithium prevents parasitic reactions for a much improved CE. This new ALD chemistry for conformal LiF not only offers a promising avenue to implement lithium metal anodes for high-capacity batteries but also paves the way for future studies to investigate failure and evolution mechanisms of solid electrolyte interphase (SEI) using our LiF on anodes such as graphite, silicon, and lithium.

    View details for PubMedID 29986134