Stability of the LiMn2O4 surface in a LiPF6-based non-aqueous electrolyte studied by in-situ atomic force microscopy
Stability of the LiMn2O4 surface in a LiPF6-based non-aqueous electrolyte studied by in-situ atomic force microscopy
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DOI：
10.7567/jjap.55.065801
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发表时间：
2016-05
影响因子：
1.5
通讯作者：
M. Kitta;M. Kohyama
中科院分区：
文献类型：
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作者：
M. Kitta;M. Kohyama
研究电极材料在液体电解质中的表面稳定性对于理解储存的锂离子电池单元的劣化非常重要。在这里，我们研究了LiMn 2 O 4表面的LiPF 6为基础的非水电解质通过原位原子力显微镜。从MnO（111）晶片上制备了具有良好原子级平坦结构的LiMn 2 O 4（111）表面样品。虽然未暴露或干燥空气暴露的样品的表面在典型的电解质如溶解在碳酸亚丙酯中的LiPF 6中没有变化，但在相同条件下暴露于空气的样品的表面形态发生了很大变化。透射电子显微镜观察表明，表面粗糙度增加的溶解的一个或两个原子层的LiMn 2 O 4-晶体表面的电解质。暴露在空气中的表面上的吸附水是这种现象的根源。
Investigation of the surface stability of electrode materials in a liquid electrolyte is significantly important for understanding the deterioration of stored Li-ion battery cells. Here, we examined LiMn2O4 surfaces in a LiPF6-based non-aqueous electrolyte by in-situ atomic force microscopy. A LiMn2O4(111) surface sample with a well-defined atomically-flat structure was prepared from a MnO(111) wafer. Although the surfaces of non-exposed or dry-air-exposed samples did not change in a typical electrolyte such as LiPF6 dissolved in propylene carbonate, the surface morphology of an air-exposed sample greatly changed under the same condition. Transmission electron microscopy observation revealed that the surface roughness is increased by the dissolution of one or two atomic layers of LiMn2O4-crystal surfaces in the electrolyte. The adsorbed water on the air-exposed surface is the origin of this phenomenon.