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Interfacial Active Fluorine Sites Induced Electron Transfer on TiO2 (001) Facets to Enhance Polysulfide Redox Reactions for Better Liquid Li2S6-Based Lithium Sulfur Batteries

Abstract

Since their high-efficiency and low cost, the TiO2 materials are one of the promising candidates as polysulfide hosts in the high-performance lithium sulfur (Li-S) batteries. Among them, TiO2 with (001) facets have been proved to preferably mitigate “shuttle” reactions of polysulfides and improve redox reactions. However, further strategies to promote the (001) facet function are seldom reported. Herein, the interfacial active fluorine sites on TiO2 (001) facets are introduced by a facile deliberation of chemical tailoring strategy for promoting the performance of the liquid Li2S6-based Li-S batteries. Due to the F-doping induced interfacial electron transfer, TiO2 (001) facts not only increase the adsorption ability with polysulfides by interfacial synergistic effect of Ti, O and F sites, but also improve charge carriers in the crystal structure owing to the part of Ti4+ ions (d0 orbital) are reduced to Ti3+ ions (d1 orbital). As a result, the liquid Li2S6-based electrodes (area: 2 cm2) supply the initial capacities of 1260 and 970 mAh/g, and retain 1030 and 500 mAh/g after 500 cycles at 0.8 and 3.2 mA/cm2 under 1.0 and 3.0 mg/cm2 sulfur mass loading, respectively. This work also demonstrates the interfacial active sites effect in the high-performance Li-S batteries.

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Publication details

The article was received on 05 Dec 2018, accepted on 12 Feb 2019 and first published on 13 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA11732B
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Interfacial Active Fluorine Sites Induced Electron Transfer on TiO2 (001) Facets to Enhance Polysulfide Redox Reactions for Better Liquid Li2S6-Based Lithium Sulfur Batteries

    C. Zha, X. Gu, D. Wu and H. Chen, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11732B

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