The shuttle effect of lithium polysulfides(LiPSs)and their sluggish kinetic processes lead to rapid capacity fading and poor cycling stability in lithium-sulfur(Li-S)batteries,limiting their commercial viability.This ...The shuttle effect of lithium polysulfides(LiPSs)and their sluggish kinetic processes lead to rapid capacity fading and poor cycling stability in lithium-sulfur(Li-S)batteries,limiting their commercial viability.This study proposes a functionalized separator with adsorption and synergistic catalysis ability for Li-S batteries.The modified separator comprises Ti_(3)C_(2)T_(x) sheets,CoO,and MoO_(3).Experimental and theoretical calculations demonstrate that Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite not only effectively inhibits the shuttle effect of LiPSs,ensuring efficient utilization of active materials,but also enhances reversibility and reaction kinetics among LiPSs.The full exposure of active sites in the Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite and the synergistic action of different catalysts enable efficient capture and conversion of LiPSs molecules at the material surface.Besides,the lithium-sulfur batteries with Ti_(3)C_(2)T_(x)/CoO/MoO_(3)@PP separator exhibited only a 0.042%capacity decay per cycle at 0.5 C(800 cycles).Moreover,a high areal capacity of 6.85 mAh cm-2 was achieved at high sulfur loading(7.9 mg cm-2)and low electrolyte-to-sulfur ratio(10μL mg-1).展开更多
基金Institute of Advanced Study of Central South UniversityHigh Performance Computing Center of Central South University。
文摘The shuttle effect of lithium polysulfides(LiPSs)and their sluggish kinetic processes lead to rapid capacity fading and poor cycling stability in lithium-sulfur(Li-S)batteries,limiting their commercial viability.This study proposes a functionalized separator with adsorption and synergistic catalysis ability for Li-S batteries.The modified separator comprises Ti_(3)C_(2)T_(x) sheets,CoO,and MoO_(3).Experimental and theoretical calculations demonstrate that Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite not only effectively inhibits the shuttle effect of LiPSs,ensuring efficient utilization of active materials,but also enhances reversibility and reaction kinetics among LiPSs.The full exposure of active sites in the Ti_(3)C_(2)T_(x)/CoO/MoO_(3) composite and the synergistic action of different catalysts enable efficient capture and conversion of LiPSs molecules at the material surface.Besides,the lithium-sulfur batteries with Ti_(3)C_(2)T_(x)/CoO/MoO_(3)@PP separator exhibited only a 0.042%capacity decay per cycle at 0.5 C(800 cycles).Moreover,a high areal capacity of 6.85 mAh cm-2 was achieved at high sulfur loading(7.9 mg cm-2)and low electrolyte-to-sulfur ratio(10μL mg-1).
