We demonstrate the fabrication of high-quality electrochemically active organic lithium electrode thin films by the currently strongly emerging combined atomic/molecular layer deposition (ALD/MLD) technique using lithium terephthalate, a recently found anode material for lithium-ion battery (LIB), as a proof-of-the-concept material. Our deposition process for Li-terephthalate is shown to well comply with the basic principles of ALD-type growth including the sequential self-saturated surface reactions, a necessity when aiming at micro-LIB devices with three-dimensional architectures. The as-deposited films are found crystalline across the deposition temperature range of 200-280 degrees C, which is a trait highly desired for an electrode material but rather unusual for hybrid inorganic-organic thin films. Excellent rate capability is ascertained for the Li-terephthalate films with no conductive additives required. The electrode performance can be further enhanced by depositing a thin protective LiPON solid-state electrolyte layer on top of Li-terephthalate; this yields highly stable structures with capacity retention of over 97% after 200 charge/discharge cycles at 3.2 C.
- 1 Päättynyt
Mustonen, O., Multia, J., Philip, A., Srivastava, D., Tripathi, T., Jin, H., Khayyami, A., Thomas, C., Ahvenniemi, E., Heiska, J., Medina, E., Ghazy, A., Hagen, D., Lepikko, S., Karppinen, M., Aleksandrova, I., Haggren, A. & Nisula, M.
23/12/2013 → 31/01/2019
Projekti: EU: ERC grants