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- W4311005137 endingPage "232501" @default.
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- W4311005137 abstract "Owing to the environmental friendliness, high specific energy, high theoretical capacity, and low cost, lithium-sulfur (Li–S) battery has drawn great attention as the next-generation device. However, the poor conductivity of the sulfur and lithium sulfides, large volumetric expansion of S to Li2S after lithiation, and the dissolution of lithium polysulfides in electrolyte, lead to low specific capacity, high cyclic capacity loss, and bad cycle performance. Here, we propose a heterojunction structure of multiferroic BiFeO3 anchored on hollow spheric TiO2 coated on Celgard separator to overcome the “shuttle effect” of dissolved intermediate polysulfides, improving poor conductivity of S and its discharge products Li2S2/Li2S, and inhibiting lithium dendrites. The multiferroic BiFeO3 provides a spontaneous polarization to trap polysulfides, and hollow spheric TiO2 divides a large surface area for sulfur expansion and improves the poor conductivity of S and BiFeO3 simultaneously. As a result, the discharge capacity remained at 754 mAh g−1 with coulombic efficiency over 99.2% and 83.7% retention of the initial specific capacity after 800 cycles at 1.0C." @default.
- W4311005137 created "2022-12-22" @default.
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- W4311005137 date "2023-02-01" @default.
- W4311005137 modified "2023-10-14" @default.
- W4311005137 title "Entrapment of polysulfides by a BiFeO3/TiO2 heterogeneous structure on separator for high-performance Li–S batteries" @default.
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- W4311005137 doi "https://doi.org/10.1016/j.jpowsour.2022.232501" @default.
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