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• W4306649334 endingPage "141387" @default.
• W4306649334 startingPage "141387" @default.
• W4306649334 abstract "• Flake S 8 and Li 2 S nucleate on polar surface but island-like ones on apolar surface. • By-path deposition aggravates Li 2 S segregation leading to capacity decay. • Interaction of Li-shunt growth and Li 2 S segregation causes rapid cathode failure. • Areal capacity of 24.6 mAh cm −2 and energy density of 47.9 mWh cm −2 are achieved. Active-substance (S 8 and Li 2 S) deposition layer formed on polar interfaces is more reactive than that formed on apolar interfaces. However, when deposition layer reaches a certain thickness, by-path active-substance deposition takes place because of polysulfide disproportionation, which aggravates active-substance segregation to decrease the reactivity. This leads to a significant capacity decay and failure to accomplish polysulfide delithiation after certain cycles, which is understood as the results of decreased active-substance utilization and formed local micro-short-circuits, respectively. The finding of correlation between active-substance segregation and cathode deterioration inspires the design of polytetrafluoroethylene-based self-supported cathode to suppress active-substance segregation through avoiding increase of interphase contact resistance during cycling. With S-loading of 4.0 mg cm −2 , the as-prepared cathode demonstrates excellent cycleability, retaining a capacity of 300 mAh g −1 at a rate of 2C after 1000 cycles. When increasing S-loading up to 36.5 mg cm −2 , the as-obtained cathode delivers an ultra-high areal capacity of 24.6 mAh cm −2 after 100 cycles at 0.1 C. However, increasing S-loading aggravates Li 2 S segregation which then narrows down Li + transportation, leading to formation and growth of Li-shunts which in turn stimulates active-substance segregation. Such an inductive interaction between Li-shunt growth and active-substance segregation results in the fast formation of local micro-short-circuits, causing the constant supply of Li from Li shunts to cathode, and eventually accelerating cathode deterioration." @default.
• W4306649334 created "2022-10-18" @default.
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• W4306649334 date "2022-12-01" @default.
• W4306649334 modified "2023-10-12" @default.
• W4306649334 title "A novel insight into deterioration of heavily sulfur-loaded cathode in Li-S battery" @default.
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• W4306649334 doi "https://doi.org/10.1016/j.electacta.2022.141387" @default.
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