Surface Characterization of LiFePO<sub>4</sub> Epitaxial Thin Films by X-ray/Neutron Reflectometry
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The electrode surface of a lithium battery was characterized using <i>in situ</i> reflectivity techniques and epitaxial thin films. Epitaxial LiFePO<sub>4</sub> thin films were fabricated by pulsed laser deposition. Changes in interfacial structures on the surface are determined by X-ray and neutron reflectivity (NR) measurements using an X-ray-transmission electrochemical cell. The LiFePO<sub>4</sub> surface is stable during the first charge/discharge process. NR analysis indicates a reversible change in the concentration gradient of lithium ions at the LiFePO<sub>4</sub>/electrolyte interface on lithium deintercalation.
Electrochemistry 78(5), 413-415, 2010
The Electrochemical Society of Japan