A novel mechanism on discharge-charge process in Li/S batteries
| Autor: | Jingdong Liu, Yuanhui Zheng, Haiman Hu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Reaction mechanism Materials science Passivation General Chemical Engineering General Engineering General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences chemistry Chemical engineering Electrode General Materials Science Lithium Chemical equilibrium Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Ionics. 27:2989-2996 |
| ISSN: | 1862-0760 0947-7047 |
| Popis: | Fundamental understanding on reaction mechanism of a working Li/S system is of great significance to design better batteries. In view of the importance of lithium polysulfides (PSs) in the working process of battery, PSs saturated solution in ethylene glycol dimethyl ether/1,3-dioxolane (DME/DOL) was synthesized by chemical method. The properties of PSs solution were studied by Tyndall experiment, UV-Vis spectroscopy, and OCP-t curve. It was found that the PSs solution is heterogeneous. PSs and S8 maintain dynamic equilibrium through disproportionation reaction. S8 generated accounts for passivation of electrode. Cyclic voltammetry of S/C electrode under different fabrication conditions were studied by using three electrode system. It was found that Li2S generated through reduction of PSs helps to dissolve passive layer and activates electrode. Passivation is more serious at charge stage. Process of electrode is an electron transfer reaction accompanied by chemical equilibrium. A novel mechanism based on precipitation and dissolution of S8 at the surface of electrode is used to elucidate the discharge-charge process of Li/S battery. |
| Databáze: | OpenAIRE |
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