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arXiv 2405.07413cond-mat.mtrl-sci
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揭示锂离子电池固态电解质纳米薄膜的各向异性杂化

Unraveling Anisotropic Hybridizations of Solid-state Electrolyte Nano-films in Li-ion Batteries

Yuanjie Ning, Wenjun Wu, Liang Dai, Shuo Sun, Zhigang Zeng, Dengsong Zhang, Mark B. H. Breese, Chuanbing Cai, Chi Sin Tang, Xinmao Yin

AI总结:

本研究利用 PLD 在不同取向 LCO 上外延制备 LWO 纳米薄膜,结合同步辐射 XAS、XPS 与态密度计算,揭示其 W5d(eg)-O2p 杂化的取向各向异性。

摘要:

Li2WO4(LWO)因其作为固态电解质的潜力而受到认可,并且已被证明能够增强锂离子电池中 LiCoO2(LCO)正极的电化学性能。然而,以往对 LWO 的研究主要涉及多晶结构,因此缺乏对其与单晶体系接触时行为的全面理解,尤其是与 LCO 密切相关的体系。在本研究中,我们采用脉冲激光沉积(PLD)技术,在不同取向的 LCO 层上外延合成 LWO 纳米薄膜。基于包括 X 射线吸收谱(XAS)和 X 射线光电子能谱(XPS)在内的一系列高分辨率同步辐射技术,我们仔细考察了 LWO 的电子结构,并观察到与 LWO/LCO(003) 相比,LWO/LCO(104) 中 W5d(eg)-O2p 轨道杂化的主能级更高。这一实验发现进一步得到一整套态密度计算的验证。此外,详细的偏振 XAS 表征揭示了两种取向 LWO 构型之间显著的各向异性。这项利用同步辐射技术能力的综合性科学研究为未来研究提供了宝贵见解,并为在高功率锂离子电池中将 LWO 优化用作 LCO 正极的固态电解质或修饰层提供指导。

英文摘要:

Li2WO4 (LWO) is recognized for its potential as a solid-state electrolyte and it has demonstrated the ability to enhance the electrochemical performance of LiCoO2 (LCO) cathodes in Li-ion batteries. However, prior investigations into LWO have predominantly involved polycrystalline structures, thereby lacking a comprehensive understanding of its behavior when interfaced with single crystal systems, particularly those intricately connected to LCO. In this study, we employ pulsed laser deposition (PLD) to epitaxially synthesize LWO nano-films on LCO layers with different orientations. Based on a series of high-resolution synchrotron-based techniques including X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS), the electronic structure of LWO is carefully scrutinized where a higher main energy level of W5d(eg)-O2p orbitals hybridization in LWO/LCO(104) as compared to LWO/LCO(003) has been observed. This experimental finding is further validated by a comprehensive set of density of states calculations. Furthermore, detailed polarized XAS characterization unveils distinct anisotropy between the two oriented LWO configurations. This comprehensive scientific investigation, harnessing the capabilities of synchrotron-based techniques, provides invaluable insights for future studies, offering guidance for the optimized utilization of LWO as a solid-state electrolyte or modification layer for LCO cathodes in high-powered Li-ion batteries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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