Abstract
The rate-limiting step in lithiation/delithiation of solid-state cathode materials is not well understood. Phase-transformation reaction rate, lithium ion diffusion coefficient, and lithium ion concentration have all been shown to affect the discharge and charge performance. All three parameters are affected by the crystal structure and crystallinity of the cathode. In this paper, lithium trivanadate (LiV3O8) is selected as a representative cathode for all solid-state thin-film batteries because of its glass ceramic properties at different annealing temperatures, where the crystallinity and preferred orientation vary. The intermediate temperature-treated thin films outperform both the amorphous and the most crystalline thin films. By correlating the cell polarization with both the diffusion coefficient and the lithium ion concentration at different states of charge, we gain insights into the electrochemical performance of the glass ceramic LiV3O8 cathode.
| Original language | English |
|---|---|
| Pages (from-to) | 6135-6144 |
| Number of pages | 10 |
| Journal | Chemistry of Materials |
| Volume | 31 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 27 2019 |
Funding
This paper has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). This research was supported by the Center for Mesoscale Transport Properties, an Energy Frontier Research Center supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under award no. DE-SC0012673. The authors would like to acknowledge Dr. Qing Zhang for the synthesis of LVO powder materials for making the sputtering target in this study. Also, we thank Dr. Frank M. Delnick for invaluable discussions on collecting and analysis of the impedance spectroscopy. E.S.T. acknowledges the generous support of William and Jane Knapp including the Knapp Chair in Energy and the Environment.
