Spontaneous lithiation of binary oxides during epitaxial growth on LiCoO2

DOI: 10.1021/acs.nanolett.2c01701

Authors: Le Wang (Pacific Northwest National Laboratory) , Zhenzhong Yang (Pacific Northwest National Laboratory; East China Normal University) , Widitha S. Samarakoon (Pacific Northwest National Laboratory; Oregon State University) , Yadong Zhou (Pacific Northwest National Laboratory; East China Normal University) , Mark E. Bowden (Pacific Northwest National Laboratory) , Hua Zhou (Advanced Photon Source) , Jinhui Tao (Pacific Northwest National Laboratory) , Zihua Zhu (Pacific Northwest National Laboratory) , Nabajit Lahiri (Pacific Northwest National Laboratory) , Timothy C. Droubay (Pacific Northwest National Laboratory) , Zachary W. Lebens-Higgins (Binghamton University) , Xinmao Yin (Shanghai University) , Chi Sin Tang (A*STAR (Agency for Science, Technology and Research)) , Zhenxing Feng (Oregon State University) , Louis F. J. Piper (Binghamton University; he University of Warwick) , Andrew T. S. Wee (National University of Singapore) , Scott A. Chambers (Pacific Northwest National Laboratory) , Yingge Du (Pacific Northwest National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Letters , VOL 9

State: Published (Approved)
Published: June 2022
Diamond Proposal Number(s): 19162

Abstract: Epitaxial growth is a powerful tool for synthesizing heterostructures and integrating multiple functionalities. However, interfacial mixing can readily occur and significantly modify the properties of layered structures, particularly for those containing energy storage materials with smaller cations. Here, we show a two-step sequence involving the growth of an epitaxial LiCoO2 cathode layer followed by the deposition of a binary transition metal oxide. Orientation-controlled epitaxial synthesis of the model solid-state-electrolyte Li2WO4 and anode material Li4Ti5O12 occurs as WO3 and TiO2 nucleate and react with Li ions from the underlying cathode. We demonstrate that this lithiation-assisted epitaxy approach can be used for energy materials discovery and exploring different combinations of epitaxial interfaces that can serve as well-defined model systems for mechanistic studies of energy storage and conversion processes.

Journal Keywords: LiCoO2; Li-ions diffusion; surface reaction; thin films; energy material

Subject Areas: Materials, Chemistry, Energy


Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: APS; SINS at Singapore Synchrotron Light Source

Added On: 04/07/2022 08:46

Discipline Tags:

Surfaces Physics Physical Chemistry Energy Materials Chemistry Materials Science interfaces and thin films

Technical Tags:

Spectroscopy X-ray Photoelectron Spectroscopy (XPS) Hard X-ray Photoelectron Spectroscopy (HAXPES)