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Showing 131-140 of 144

Direct observation by transmission electron microscopy of the influence of Ni catalyst-seeds on the growth of GaN–AlGaN axial heterostructure nanowires

Publication

Journal of Crystal Growth

Lari, L.; Walther, T.; Gass, M.H.; Geelhaar, L.;Chèze, C.; Riechert, H.; Bullough, T. J.; Chalker, P. R.

A study of GaN–AlGaN nanowire heterostructures grown by molecular beam epitaxy on sapphire substrates is presented. Nanowire growth was promoted using nickel seeds formed by in-situ annealing of a Ni thin film.
Localization by TEM and EELS of deuterium trapping sites in CFC exposed to plasma irradiation in Tore Supra

Publication

Journal of Nuclear Materials

Bernier, N.; Brosset, C.; Bocquet, F.; Tsitrone, E.; Saikaly, W.; Khodja, H.; Alimov, V. Kh.; Gunn, J. P.

Carbon fiber composite (CFC) Sepcarb® N11 is used in the tokamak Tore Supra as plasma-facing components.
Mapping titanium and tin oxide phases using EELS: An application of independent component analysis

Publication

Ultramicroscopy

de la Peña, F.; Berger, M. H.; Hochepied, J. F.; Dynys, F.; Stephan, O.; Walls, M.

We study materials that present challenges for conventional elemental mapping techniques and can in some cases be treated successfully using independent component analysis (ICA).
Fe valence determination and Li elemental distribution in lithiated FeO0.7F1.3/C nanocomposite battery materials by electron energy loss spectroscopy (EELS)

Publication

Micron

Cosandeya, F.; Suc, D.; Sinaa, M.; Pereiraa, N.; Amatuccia, G. G.

Electron energy loss spectroscopy (EELS) is a powerful technique for studying Li-ion battery materials because the valence state of the transition metal in the electrode and charge transfer during lithiation and delithiation processes can be analyzed by measuring the relative intensity of the tra
Capacity fade of LiAlyNi1-x-yCoxO2 cathode for lithium-ion batteries during accelerated calendar and cycle life tests (surface analysis of LiAlyNi1-x-yCoxO2 cathode after cycle tests in restricted depth of discharge ranges)

Publication

Journal of Power Sources

Watanabe, S.; Kinoshita, M.; Hosokawa, T.; Morigaki, K.; Nakura, K.

Cycle performance of a LiAl0.10Ni0.76Co0.14O2 (NCA) cathode/graphite cell closely depended on the range of depth of discharge in charge–discharge processes (ΔDOD). When ΔDOD was 10–70%, cycle performance at 25 °C was maintained even at 60 °C.
Tracking lithium transport and electrochemical reactions in nanoparticles

Publication

Nature Communications

Wang, F.; Yu, H. C.; Chen, M. H.; Wu, L.; Pereira, N.; Thornton, K.; Van der Ven, A.; Zhu, Y.; Amatucci, G. G.; Graetz, J.

Expectations for the next generation of lithium batteries include greater energy and power densities along with a substantial increase in both calendar and cycle life.
Two-phase separation in a lithiated spinel Li4Ti5O12 crystal as confirmed by electron energy-loss spectroscopy

Publication

Journal of Power Sources

Kitta, M.; Akita, T.; Tanaka, S.; Kohyama, M.

The coexistence state of two phases (Li4Ti5O12 and lithiated Li7Ti5O12) in spinel lithium titanium oxide (LTO; Li4Ti5O12) is examined using scanning transmission electron microscopy with electron energy-loss spectroscopy (STEM–EELS).
Electron microscopy analysis of Ti-substituted Li2MnO3 positive electrode before and after carbothermal reduction

Publication

Journal of Power Sources

Akita, T.; Tabuchi, M.; Nabeshima, Y.; Tatsumi, K.; Kohyama, M.

40%-titanium substituted Li2MnO3 (Li1+x(Ti0.4Mn0.6)1−xO2, 0
Characterization of two phase distribution in electrochemically-lithiated spinel Li4Ti5O12 secondary particles by electron energy-loss spectroscopy

Publication

Journal of Power Sources

Kitta, M.; Akita, T.; Tanaka, S.; Kohyama, M.

Spinel lithium titanate, Li4Ti5O12 (LTO) is attracting much attention as an alternative material replacing carbon based anodes in lithium ion batteries, due to its high rate properties as well as its durability and safety.
STEM characterization for lithium-ion battery cathode materials

Publication

Current Opinion in Solid State and Materials Science

Huang, R.; Ikuhara, Y.

This article briefly reviews the status and new progress on the characterization of popular cathode materials for lithium-ion batteries by scanning transmission electron microscopy (STEM) and presents some of our own research work in this field, especially the direct observation of light elements

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