Unveiling the Stable Nature of the Solid Electrolyte Interphase between Lithium Metal and LiPON via Cryogenic Electron Microscopy
Unveiling the Stable Nature of the Solid Electrolyte Interphase between Lithium Metal and LiPON via Cryogenic Electron Microscopy
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DOI：
10.1016/j.joule.2020.08.013
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发表时间：
2020-11-18
期刊：
影响因子：
39.8
通讯作者：
Meng, Ying Shirley
中科院分区：
文献类型：
--
作者：
Cheng, Diyi;Wynn, Thomas A.;Meng, Ying Shirley
固体电解质中间相（SEI）被认为是使用液体和固体电解质的二次电池中最重要的中心点复合物，但却被认为是最不了解的成分。在全固态电池（ASSB）中缺乏这样的知识阻碍了对某些固态电解质（例如UPON）如何表现出对锂金属的示例性稳定性的完全理解。通过采用低温电子显微镜（cryo-EM），成功地保存和探测了锂金属和LiPON之间的界面，揭示了具有氮和磷浓度梯度的多层镶嵌SEI结构，在无定形基质中具体化为微晶。这种独特的SEI纳米结构小于80 nm，并且稳定且不含任何有机含锂物质或氟化锂组分，这与通常在最先进的有机液体电解质中发现的SEI形成对比。我们的研究结果揭示了对这种SEI的纳米结构和化学性质的见解，作为锂金属电池中稳定锂金属阳极的关键组分。
The solid electrolyte interphase (SEI) is regarded as the most coin center dot plex but the least understood constituent in secondary batteries using liquid and solid electrolytes. The dearth of such knowledge in allsolid-state battery (ASSB) has hindered a complete understanding of how certain solid-state electrolytes, such as UPON, manifest exemplary stability against lithium metal By employing cryogenic electron microscopy (cryo-EM), the interphase between lithium metal and LiPON is successfully preserved and probed, revealing a multilayer-mosaic SEI structure with concentration gradients of nitrogen and phosphorus, materializing as crystallites within an amorphous matrix. This unique SEI nanostructure is less than 80 nm and is stable and free of any organic lithium-containing species or lithium fluoride components, in contrast to SEIs often found in state-of-the-art organic liquid electrolytes. Our findings reveal insights on the nanostructures and chemistry of such SEIs as a key component in lithium metal batteries to stabilize lithium metal anode.