Surface Characterization of LiFePO4 Epitaxial Thin Films by X-ray/Neutron Reflectometry

Hirayama, Masaaki; Yonemura, Masao; Suzuki, Kota; Torikai, Naoya; Smith, Harold L.; Watkinsand, Erik; Majewski, J.; Kanno, Ryoji

doi:10.5796/electrochemistry.78.413

Cited by 55 publications

(61 citation statements)

References 12 publications

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“…There have been a number of related NR studies with in situ electrochemistry addressing an interesting range of challenges such as battery electrodes [107][108][109][110][111], solid electrolyte interface SEI formation [84], electroactive polymer films [112][113][114] and other double layer capacitance systems, such as ionic liquids at surfaces [56,115,116], as well as the formation and properties of passivating oxide layers [68,91,100].…”

Section: Electrochemicalmentioning

confidence: 99%

“…As outlined above, NR is particularly powerful in studying light materials such as lithium, even more so when different isotopes are used to change the contrast [111]. There are several papers coupling electrochemistry and NR to study model battery materials, many of which address the movement of lithium into other materials, such as silicon, under different conditions [107][108][109][110]. Lithiated silicon is a key material for batteries and exhibits a 'solid electrolyte interface' (or interphase) in the cell.…”

Section: Battery Materials Studiesmentioning

confidence: 99%

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Neutron Reflectometry for Studying Corrosion and Corrosion Inhibition

Wood

Clarke

2017

Metals

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Neutron reflectometry is an extremely powerful technique to monitor chemical and morphological changes at interfaces at the angstrom-level. Its ability to characterise metal, oxide and organic layers simultaneously or separately and in situ makes it an excellent tool for fundamental studies of corrosion and particularly adsorbed corrosion inhibitors. However, apart from a small body of key studies, it has yet to be fully exploited in this area. We present here an outline of the experimental method with particular focus on its application to the study of corrosive systems. This is illustrated with recent examples from the literature addressing corrosion, inhibition and related phenomena.

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Section: Electrochemicalmentioning

confidence: 99%

Section: Battery Materials Studiesmentioning

confidence: 99%

Neutron Reflectometry for Studying Corrosion and Corrosion Inhibition

Wood

Clarke

2017

Metals

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“…46,47 Scattering length density (SLD) profiles are calculated by the fitting results of reflectivity spectra, which provide information on atomic distribution changes in the depth direction from the electrode to the electrolyte. 24,29,48 Figure 7 shows scattering length density profiles of a olivine-type LiFePO 4 (100) film with different conditions. The LiFePO 4 (100) shows a slight decrease in the SLD from the pristine to OCV conditions, which corresponds to the increase in the lithium content in the electrode film after the electrochemical interface formation.…”

Section: Lithium Ion Distribution At the Lifepo 4 /Electrolyte Interfacementioning

confidence: 99%

Interfacial Reactions of Intercalation Electrodes in Lithium Ion Batteries

Hirayama

2015

Electrochemistry

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Gaining a thorough understanding of the electrochemical interface in lithium ion batteries is essential for the development of a common strategy for the material design. This comprehensive paper presents the interfacial reaction analyses between intercalation electrodes and organic electrolytes using an epitaxial-film model electrode and in situ surface scattering techniques. The crystal structures of the intercalation electrodes drastically change in 10 nm-regions from the top of the electrode surface when soaked to the electrolyte and are reconstructed during the initial electrochemical reaction, which is accompanied with formation of a solid electrolyte interface layer. The reconstructed interfaces have a pronounced effect on the power characteristics and the stability at the subsequent electrochemical cycles.

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“…The surface structural changes have already been observed using in situ x-ray scattering techniques. [14][15][16][17][18][19][20] It is well known that neutrons are powerful probes for determining structural information about light elements such as hydrogen and lithium, especially in comparison with X-ray. Furthermore, the neutron scattering technique will allow us to 1 To whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%