Characterization of electrode/electrolyte interface using in situ X-ray reflectometry and LiNi0.8Co0.2O2 epitaxial film electrode synthesized by pulsed laser deposition method

Hirayama, Masaaki; Sakamoto, Kazuyuki; Hiraide, Tetsuya; Mori, Daisuke; Yamada, Atsuo; Kanno, Ryoji; Sonoyama, Noriyuki; Tamura, Kazuhisa; Мizuki, J.

doi:10.1016/j.electacta.2007.07.074

Cited by 59 publications

(62 citation statements)

References 32 publications

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“…It is desirable for lithium transition metal oxides that the targets had an excess lithium composition to compensate a lithium loss during the high temperature PLD process. Epitaxial films of lithium-contained materials have been reported such as the layered rocksalt, 19,20,[22][23][24][25] 32 which is summarized in Table 1. Thickness of the films is controllable from few nanometers to a hundred nanometer by changing the duration for deposition.…”

Section: Fabrication and Electrochemical Activity Of Epitaxial-film Ementioning

confidence: 99%

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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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Section: Fabrication and Electrochemical Activity Of Epitaxial-film Ementioning

confidence: 99%

“…[19][20][21] First, the twodimensional interface with very flat surfaces with roughnesses of ³1 nm provides a simple reaction field with no addictive species. Second, the film thickness can be controlled in the range 1 to 100 nm; a very thin film can function as a surface-enhanced electrode.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Reactions of Intercalation Electrodes in Lithium Ion Batteries

Hirayama

2015

Electrochemistry

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“…2,3 The surface reaction mechanism was reported during the charge process by crystal structure analysis. 4 However, the Li + /Ni 2+ cation mixing caused the LiNi 0.8 Co 0.2 O 2 to lower cycle performance. If the crystal and electronic structure of LiNi 0.8 Co 0.2 O 2 was revealed during charge/discharge process, the expression mechanism of excellent performance in the secondary battery must be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…The alternative material of the most used cathode material, LiCoO 2 , has been focused on the LiNi 0.8 Co 0.2 O 2 from the viewpoint of low cost and high capacity and then the substituted materials of Co for Al or Mg has already been commercial use. To obtain the advanced battery property and thermal stability, particle technology was applied for the purpose of the surface modification by sol-gel synthesis 1 and AlPO 4 and Co 3 (PO 4 ) 3 coating. 2,3 The surface reaction mechanism was reported during the charge process by crystal structure analysis.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure Analysis in the Charge and Discharge Process of Li-ion Battery Cathode-material LiNi0.8Co0.2O2

et al. 2016

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The LiNi 0.8 Co 0.2 O 2 was synthesized by the coprecipitation method, and then measured using powder neutron diffractions of electrochemically cycled cathodes. Crystal and electronic structure analyses were conducted using the Rietveld and maximum entropy methods (MEM). Based on those results, we tried to reveal the charge and discharge mechanism of this material, and to clarify the influence of the crystal structure on the several charge or discharge depths. We analysed the crystal structures of the electrodes after second discharge process as well as the pristine electrode by the Rietveld analysis which used neutron diffraction and synchrotron X-ray diffraction data. As a result, it was demonstrated that the crystal structure analysis by ex-situ measurement could be successfully performed even for the electrode with a weight of about 10 mg. Furthermore, we examined the average structure of the electrode accompanying with charge depths. The electrodes were prepared about 2.50 V, 3.65 V, 3.85 V, and 4.30 V which corresponded to the plateau portions of a 10th charging curve. In the analysis of the electrode accompanying charge depths, it was suggested that there was almost no participation to cation mixing accompanying charge depth.

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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%