An Air-Stable and Dendrite-Free Li Anode for Highly Stable All-Solid-State Sulfide-Based Li Batteries
An Air-Stable and Dendrite-Free Li Anode for Highly Stable All-Solid-State Sulfide-Based Li Batteries
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DOI：
10.1002/aenm.201902125
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发表时间：
2019-08-22
影响因子：
27.8
通讯作者：
Sun, Xueliang
中科院分区：
文献类型：
--
作者：
Liang, Jianwen;Li, Xiaona;Sun, Xueliang
金属锂具有高比容量、低电化学电位等优点，是一种很有前途的全固态电池负极材料。然而，Li金属与大多数固态电解质的直接接触会引起严重的副反应，这可能导致枝晶形成和短路。此外，Li金属在暴露于空气时不稳定，导致严格的加工要求。在此，据报道，全固态电池中的Li 3 PS4/Li界面可以通过空气稳定的LixSiSy保护层来稳定，该保护层通过基于溶液的方法原位形成在Li金属的表面上。全固态LiCoO_2/Li_3PS_4/Li电池在对称电池中循环超过2000 h，循环寿命超过100次。基于同步加速器的高能X射线光电子能谱深入分析展示了保护层内不同成分的分布。原位形成具有高离子导电性的电子绝缘LixSiSy保护层提供了防止高能全固态Li金属电池中Li枝晶形成的有效方法。
Li metal is a promising anode material for all-solid-state batteries, owing to its high specific capacity and low electrochemical potential. However, direct contact of Li metal with most solid-state electrolytes induces severe side reactions that can lead to dendrite formation and short circuits. Moreover, Li metal is unstable when exposed to air, leading to stringent processing requirements. Herein, it is reported that the Li3PS4/Li interface in all-solid-state batteries can be stabilized by an air-stable LixSiSy protection layer that is formed in situ on the surface of Li metal through a solution-based method. Highly stable Li cycling for over 2000 h in symmetrical cells and a lifetime of over 100 cycles can be achieved for an all-solid-state LiCoO2/Li3PS4/Li cell. Synchrotron-based high energy X-ray photoelectron spectroscopy in-depth analysis demonstrates the distribution of different components within the protection layer. The in situ formation of an electronically insulating LixSiSy protection layer with highly ionic conductivity provides an effective way to prevent Li dendrite formation in high-energy all-solid-state Li metal batteries.