Plasma-Enhanced Atomic Layer Deposition of Ultrathin Oxide Coatings for Stabilized Lithium-Sulfur Batteries
- Plasma-Enhanced Atomic Layer Deposition of Ultrathin Oxide Coatings for Stabilized Lithium-Sulfur Batteries
- Heya Kim; Jung Tae Lee; Dong-Chan Lee; Alexandre Magasinski; 조원일; Gleb Yushin
- Li-S battery; polysulfide dissolution; plasma enhanced atomic layer deposition; aluminum oxide; activated carbon fiber; lithium sulfur batteries; fibers; nanocomposites; confinement; dissolution
- Issue Date
- Advanced Energy Materials
- VOL 3, NO 10, 1308-1315
- One of the most challenging problems in the development of lithium–sulfur batteries is polysulfide dissolution, which leads to cell overcharge and low columbic efficiency. Here, we propose the formation of a thin conformal Li-ion permeable oxide layer on the sulfur-carbon composite electrode surface by rapid plasma enhanced atomic layer deposition (PEALD) in order to prevent this dissolution, while preserving electrical connectivity within the individual electrode particles. PEALD synthesis offers a fast deposition rate combined with a low operating temperature, which allows sulfur evaporation during deposition to be avoided. After PEALD of a thin layer of aluminium oxide on the surface of electrode composed of large (ca. 10 μm in diameter) S-infiltrated activated carbon fibers (S-ACF), significantly enhanced cycle life is observed, with a capacity in excess of 600 mA·h·g−1 after 300 charge–discharge cycles. Scanning electron microscopy (SEM) shows a significant amount of redeposited lithium sulfides on the external surface of regular S-ACF electrodes. However, the PEALD alumina-coated electrodes show no lithium sulfide deposits on the fiber surface. Energy dispersive spectroscopy (EDS) studies of the electrodes’ chemical composition further confirms that PEALD alumina coatings dramatically reduce S dissolution from the cathodes by confining the polysulfides inside the alumina barrier.
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