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Why some interfaces cannot be sharp

Publication

Nature Materials

Nakagawa, N.; Hwang, H. Y.; Muller, D. A.

A central goal of modern materials physics and nanoscience is the control of materials and their interfaces to atomic dimensions. For interfaces between polar and nonpolar layers, this goal is thwarted by a polar catastrophe that forces an interfacial reconstruction.
New method for detection of Li inside He bubbles formed in B10-alloyed steel after neutron irradiation

Publication

Micron

Klimenkov M.; Möslang A.; Materna-Morris, E.

Electron energy loss spectroscopy (EELS) was used to detect and study the spatial distribution on the nanoscale of He and Li in boron-alloyed steel after neutron irradiation.
Characterization of surface metallic states in SrTiO3 by means of aberration corrected electron microscopy

Publication

Ultramicroscopy

Sánchez-Santolino, G.; Tornos, J.; Bruno, F. Y.; Cuellar, F. A.; Leon, C.; Santamaría, J.; Pennycook, S. J.; Varela, M.

An unusual conducting surface state can be produced in SrTiO3 substrates by irradiation with Argon ions from a plasma source, at low energy and high doses.
2D Atomic mapping of oxidation states in transition metal oxides by scanning transmission electron microscopy and electron energy-loss spectroscopy

Publication

Physical Review Letters

Tan, H.; Turner, S.; Yücelen, E.; Verbeeck, J.; Van Tendeloo, G.

Using a combination of high-angle annular dark-field scanning transmission electron microscopy and atomically resolved electron energy-loss spectroscopy in an aberration-corrected transmission electron microscope we demonstrate the possibility of 2D atom by atom valence mapping in the mixed valen
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
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.
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
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).
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.
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.

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