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首页> 外文期刊>Advanced energy materials >Hybrid Lithium-Sulfur Batteries with an Advanced Gel Cathode and Stabilized Lithium-Metal Anode
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Hybrid Lithium-Sulfur Batteries with an Advanced Gel Cathode and Stabilized Lithium-Metal Anode

机译：混合锂硫电池，具有先进的凝胶阴极和稳定的锂金属阳极

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摘要

The insulating nature of sulfur, polysulfide shuttle effect, and lithium-metal deterioration cause a decrease in practical energy density and fast capacity fade in lithium-sulfur (Li-S) batteries. This study presents an integrated strategy for the development of hybrid Li-S batteries based on a gel sulfur cathode, a solid electrolyte, and a protective anolyte composed of a highly concentrated salt electrolyte containing mixed additives. The dense solid electrolyte completely blocks polysulfide diffusion, and also makes it possible to investigate the cathode and anode independently. This gel cathode effectively traps the polysulfide active material while maintaining a low electrolyte to sulfur ratio of 5.2 mL g(-1). The anolyte effectively protects the Li metal and suppresses the consumption of liquid electrolyte, enabling stable long-term cycling for over 700 h in Li symmetric cells. This advanced design can simultaneously suppress the polysulfide shuttle, protect Li metal, and reduce the liquid electrolyte usage. The assembled hybrid batteries exhibit remarkably stable cycling performance over 300 cycles with high capacity. Finally, surface-sensitive techniques are carried out to directly visualize and probe the interphase formed on the surface of the Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) pellet, which may help stabilize the solid-liquid interface.
机译：硫的绝缘性质，多硫化物的穿梭效应以及锂金属的劣化导致锂硫（Li-S）电池的实际能量密度降低和容量快速衰减。这项研究提出了一种开发混合动力锂离子电池的综合策略，该电池基于凝胶硫阴极，固体电解质和保护性阳极电解液，该电解液由含有混合添加剂的高浓度盐电解质组成。致密的固体电解质完全阻止了多硫化物的扩散，也使独立研究阴极和阳极成为可能。该凝胶阴极可有效捕集多硫化物活性材料，同时保持5.2 mL g（-1）的低电解质与硫之比。阳极电解液可有效保护锂金属并抑制液体电解质的消耗，从而使Li对称电池中稳定的长期循环超过700小时。这种先进的设计可以同时抑制多硫化物的往复运动，保护锂金属，并减少液体电解质的用量。组装的混合电池在300次循环后表现出非常稳定的循环性能，并且容量很高。最后，进行表面敏感技术以直接可视化并探测在Li1.5Al0.5Ge1.5（PO4）（3）（LAGP）颗粒表面上形成的相间相，这可能有助于稳定固液界面。

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