Delineating the Lithium–Electrolyte Interfacial Chemistry and the Dynamics of Lithium Deposition in Lithium–Sulfur Batteries,Advanced Energy Materials

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Delineating the Lithium–Electrolyte Interfacial Chemistry and the Dynamics of Lithium Deposition in Lithium–Sulfur Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-01-27 , DOI: 10.1002/aenm.202003293
Sanjay Nanda ₁ , Arumugam Manthiram ₁

Affiliation

Stabilizing the metallic lithium anode is the major roadblock to realizing long cycle life lithium‐sulfur (Li–S) batteries with high energy density. The chemistry of the dynamically evolving solid‐electrolyte interphase layer on the lithium surface is critical to achieving reversible plating and stripping of lithium. Herein, electrolyte formulations are carefully varied and employed to modulate the composition, and thereby, the properties of the lithium‐electrolyte interface. The impact of these changes in the interfacial chemistry on the dynamics of lithium deposition is evaluated by tracking cyclability in an anode‐free full cell configuration. Critical insights are revealed on the role of different components of the electrolyte and their interplay, including various functional groups in the electrolyte salt, oxidizing effect of lithium nitrate, and the intrinsically stabilizing effect of polysulfide species, in determining the characteristics of lithium deposition and lithium cycling efficiency. The study illuminates the key elements underlying the unique chemistry of the lithium–electrolyte interface in Li–S batteries and it can spur further development of novel strategies toward stabilizing the lithium‐metal anode in the Li–S system.

中文翻译：

描绘锂-电解质界面化学和锂-硫电池中锂沉积的动力学

稳定金属锂阳极是实现具有高能量密度的长循环寿命锂硫（Li–S）电池的主要障碍。锂表面上动态演化的固态电解质相间层的化学性质对于实现锂的可逆镀覆和剥离至关重要。在此，应仔细更改电解质配方并使用其来调节组成，从而调节锂-电解质界面的性能。通过跟踪无阳极全电池配置中的可循环性，可以评估界面化学变化对锂沉积动力学的影响。对于电解质的不同成分的作用及其相互作用，包括电解质盐中的各种官能团，硝酸锂的氧化作用，以及在确定锂沉积特性和锂循环效率方面，多硫化物物种的内在稳定作用。这项研究阐明了Li-S电池中锂-电解质界面独特化学作用的关键要素，并且可以促进稳定Li-S系统中锂金属阳极的新策略的进一步发展。

更新日期：2021-03-18

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