Designing solid-electrolyte interphases for lithium sulfur electrodes using ionic shields
| Autor: | Vandung Do, Lynden A. Archer, Min-Seop Kim, In Wook Nah, Young Rok Lim, Mun Sek Kim, Won Il Cho |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Passivation Renewable Energy Sustainability and the Environment Inorganic chemistry 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Electrochemical cell law.invention Anode chemistry.chemical_compound chemistry law Electrode General Materials Science Electrical and Electronic Engineering 0210 nano-technology Polysulfide |
| Zdroj: | Nano Energy. 41:573-582 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2017.10.018 |
| Popis: | Lithium metal is among the most sought-after anode chemistries for next-generation electrical energy storage due to its high theoretical capacity (3860 mAh g −1 ) and low reduction potential (− 3.04 V vs S.H.E.). To realize its promise, reactive Li anodes must be paired with high-energy conversion cathodes, such as sulfur or oxygen. Chemical and physical instability at both electrodes pose formidable challenges to development of practical lithium metal batteries. These instabilities are compounded by problems with active material loss and anode passivation when Li is paired with conversion cathodes, such as elemental sulfur. Here, we report on design principles and a process for creating artificial solid electrolyte interphases composed of ionic shields that are able to stabilize electrochemical processes at both the anode and cathode of Li-S electrochemical cells. We show that ASEI composed of negatively-charged nanoparticles on Li stabilize deposition of Li at the anode by multiple fundamental mechanisms. A similar concept is used to design interphases composed of positively charged conductive nanoparticles at the cathode and shown to be effective at intercepting dissolved polysulfide anions and for enhancing sulfur reutilization. We combine the two ASEI design strategies to create Li-S cells based on high-loading sulfur cathodes and demonstrate their long-term cycling stability. |
| Databáze: | OpenAIRE |
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