Uniform High Ionic Conducting Lithium Sulfide Protection Layer for Stable Lithium Metal Anode,Advanced Energy Materials

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Uniform High Ionic Conducting Lithium Sulfide Protection Layer for Stable Lithium Metal Anode
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-04-30 , DOI: 10.1002/aenm.201900858
Hao Chen ₁ , Allen Pei ₁ , Dingchang Lin ₁ , Jin Xie ₁ , Ankun Yang ₁ , Jinwei Xu ₁ , Kaixiang Lin ₁ , Jiangyan Wang ₁ , Hansen Wang ₁ , Feifei Shi ₁ , David Boyle ₁ , Yi Cui _{1,

2}

Affiliation

Artificial solid‐electrolyte interphase (SEI) is one of the key approaches in addressing the low reversibility and dendritic growth problems of lithium metal anode, yet its current effect is still insufficient due to insufficient stability. Here, a new principle of “simultaneous high ionic conductivity and homogeneity” is proposed for stabilizing SEI and lithium metal anodes. Fabricated by a facile, environmentally friendly, and low‐cost lithium solid‐sulfur vapor reaction at elevated temperature, a designed lithium sulfide protective layer successfully maintains its protection function during cycling, which is confirmed by both simulations and experiments. Stable dendrite‐free cycling of lithium metal anode is realized even at a high areal capacity of 5 mAh cm⁻², and prototype Li–Li₄Ti₅O₁₂ cell with limited lithium also achieves 900 stable cycles. These findings give new insight into the ideal SEI composition and structure and provide new design strategies for stable lithium metal batteries.

中文翻译：

稳定的锂金属阳极的均匀高离子导电硫化锂保护层

人工固体电解质中间相（SEI）是解决锂金属阳极低可逆性和树枝状生长问题的关键方法之一，但由于稳定性不足，其电流效果仍然不足。在此，提出了“同时具有高离子电导率和均匀性”的新原理，以稳定SEI和锂金属阳极。通过在高温下进行的便捷，环保，低成本的锂固硫蒸气反应制备，设计的硫化锂保护层在循环过程中成功地保持了其保护功能，这一点已通过仿真和实验得到了证实。即使在5 mAh cm ^-2的高面容量下，锂金属阳极也能实现稳定的无枝晶循环，并使用原型Li–Li ₄锂含量有限的Ti ₅ O ₁₂电池还可以实现900个稳定循环。这些发现为理想的SEI组成和结构提供了新的见识，并为稳定的锂金属电池提供了新的设计策略。

更新日期：2019-04-30

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