Photoemission Study on the Interaction Between LiCoO2 Thin Films and Adsorbed Water
Photoemission Study on the Interaction Between LiCoO2 Thin Films and Adsorbed Water
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DOI：
10.1021/acs.jpcc.5b05793
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发表时间：
2015-10-15
影响因子：
3.7
通讯作者：
Hausbrand, R.
中科院分区：
文献类型：
--
作者：
Motzko, M.;Solano, M. A. Carrillo;Hausbrand, R.
阴极-电解质界面处的表面层强烈影响锂离子电池的性能。这种表面层在电池的制造和操作过程中发现。由于水永远不能完全从制造链中排除，它将在阴极和电解质之间形成额外的表面层。在本文中，我们通过表面科学方法研究了LiCoO 2电极与H2O之间的相互作用。将H2O逐步吸附到LiCoO 2薄膜上，并且在每个步骤之后进行中间X射线光电子能谱分析。吸附导致在电极顶部形成Li 2 O/LiOH型反应层，并且由于Li离子转移出电极而导致向下的能带弯曲。
Surface layers at the cathode-electrolyte interface strongly affect the performance of the Li-ion cell. Such surface layers are found during manufacturing and operation of the battery. As water can never be fully excluded from the manufacturing chain, it will form an additional surface layer situated between cathode and electrolyte. In this contribution, we investigate the interaction between the LiCoO2 electrode and H2O by a surface science approach. H2O was adsorbed stepwise onto a LiCoO2 thin film, and intermediate X-ray photoelectron spectroscopy analysis was performed after every step. Adsorption results in the formation of a Li2O/LiOH-type reaction layer on top of the electrode and downward band bending attributed to a Lit-ion transfer out of the electrode.