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Journal Articles

Electrochemical reaction mechanisms under various charge-discharge operating conditions for Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in a lithium-ion battery

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

Journal of Solid State Chemistry, 262, p.294 - 300, 2018/06

https://doi.org/10.1016/j.jssc.2018.03.028

Times Cited Count：9 Percentile：49.17(Chemistry, Inorganic & Nuclear)

The potential in each state of charge (SOC) during charging of Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ is higher than that during discharging. To clarify the effect of chargedischarge operating conditions on the electrochemical reaction, Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ was charged and discharged under various charge-discharge operating ranges, and OCP, crystal structure, and oxidation states of the ransition metals were evaluated by electrochemical measurement, XRD, and XAFS. These results indicate that OCP, lattice parameters, and oxidation states of the transition metals of Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in each SOC are not constant. The XRD results indicate that two phases, namely, LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ -like and Li $_{2}$ MnO $_{3}$ -like, exist in Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ .

Journal Articles

Mechanisms responsible for two possible electrochemical reactions in Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ used for lithium ion batteries

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

Journal of Solid State Chemistry, 258, p.225 - 231, 2018/02

https://doi.org/10.1016/j.jssc.2017.10.024

Times Cited Count：8 Percentile：44.83(Chemistry, Inorganic & Nuclear)

Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ is known as one of the cathode electrode material for Li ion batteries and its structure during charge and discharge process was investigated using electrochemical method and X-ray diffraction. It was found that in the charge process the structure changes in the order of Li $_{2}$ MnO $_{3}$ , LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ , and Li $_{2}$ MnO $_{3}$ . On the other hand, in the discharge process, the structure changes in the order of Li $_{2}$ MnO $_{3}$ and LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ .

Journal Articles

Structural changes in surface and bulk LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ during electrochemical reaction on epitaxial thin-film electrodes characterized by X-ray scattering

Sakamoto, Kazuyuki*; Hirayama, Masaaki*; Konishi, Hiroaki*; Sonoyama, Noriyuki*; Dupr, N.*; Guyomard, D.*; Tamura, Kazuhisa; Mizuki, Junichiro; Kanno, Ryoji*

Physical Chemistry Chemical Physics, 12(15), p.3815 - 3823, 2010/04

https://doi.org/10.1039/b920271d

Times Cited Count：33 Percentile：73.38(Chemistry, Physical)

Surface and bulk structural changes of LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ were investigated during electrochemical reaction using synchrotron X-ray scattering and a restricted reaction plane consisting of two dimensional epitaxial-film electrodes. The changes in bulk structure confirmed lithium diffusion through the (110) surface, which was perpendicular to the two-dimensional (2D) edges of the layered structure. No (de)intercalation reaction was observed through the (003) surface at voltages of 3.0-5.0 V. However, intercalation did proceed through the (003) plane below 3.0 V, indicating unusual three-dimensional (3D) lithium diffusion in the over-lithiated 2D structure. During the electrochemical process, the surface of the electrode showed different structure changes from those of the bulk structure. The reaction echanism of the intercalation electrodes for lithium batteries is discussed on the basis of surface and bulk structural changes.

Journal Articles

Mechanistic study on lithium intercalation using a restricted reaction field in LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$

Sakamoto, Kazuyuki*; Konishi, Hiroaki*; Sonoyama, Noriyuki*; Yamada, Atsuo*; Tamura, Kazuhisa; Mizuki, Junichiro; Kanno, Ryoji*

Journal of Power Sources, 174(2), p.678 - 682, 2007/12

https://doi.org/10.1016/j.jpowsour.2007.06.240

Times Cited Count：24 Percentile：59.33(Chemistry, Physical)

Structure changes of LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ were detected at the electrode/electrolyte interface of lithium cell using synchrotron X-ray scattering and two-dimensional model electrodes. The electrodes were constructed by an epitaxial film of LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ synthesized by pulsed laser deposition (PLD) method. The orientation of the film depends on the substrate plane; the 2D layer of LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ is parallel to the SrTiO $_{3}$ (1 1 0) substrate ((1 1 0) LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ //(1 1 0) SrTiO $_{3}$ ), while the 2D layer is perpendicular to the SrTiO $_{3}$ (1 1 1) substrate ((0 0 3) LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ //(1 1 1) SrTiO $_{3}$ ). The X-ray diffraction of LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ (0 0 3) confirmed three-dimensional lithium diffusion through the two-dimensional transition meal layers. The intercalation reaction of LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ will be discussed.

Journal Articles

TSC modelling of current ramp scenarios with ITB-Generated bootstrap currents in JT-60U reversed shear discharges

Nakamura, Yukiharu; Tsutsui, Hiroaki*; Takei, Nahoko*; Sakamoto, Yoshiteru; Fujita, Takaaki; Sugihara, Masayoshi; Ozeki, Takahisa; Tobita, Kenji; Konishi, Satoshi; Iio, Shunji*; et al.

Europhysics Conference Abstracts, 27A, 4 Pages, 2003/00

no abstracts in English

Oral presentation

Numerical simulation of muon beam behavior in solid hydrogen

Konishi, Ren*; Okutsu, Kenichi*; Kino, Yasushi*; Sasaki, Kyosuke*; Nakashima, Ryota*; Yamashita, Takuma*; Miyashita, Konan*; Yasuda, Kazuhiro*; Okada, Shinji*; Sato, Motoyasu*; et al.

no journal, ,

Muon catalyzed fusion (CF) is a cyclic reaction where a negatively charged muon itself acts like a catalyst of nuclear fusion between hydrogen isotopes. In this work, we used PHITS code to simulate the behavior of the low-energy muon in a thin layer of the solid hydrogen.

Oral presentation

Numerical simulation for a experiment on slow muon detection from muon catalyzed fusion

Konishi, Ren*; Okutsu, Kenichi*; Kino, Yasushi*; Sasaki, Kyosuke*; Nakashima, Ryota*; Miyashita, Konan*; Yasuda, Kazuhiro*; Yamashita, Takuma*; Okada, Shinji*; Sato, Motoyasu*; et al.

no journal, ,

When muons are injected into a deuterium thin film target, muon molecules are formed. The muons released after intramolecular fusion (recycling muons) are important for the development of slow muon beams. In this study, corresponding to an experiment in which recycling muons are transported using a coaxial transport tube, the energy distribution of scattered muons, muons after deceleration, and background radiation due to bremsstrahlung by decay electrons and neutrons are analyzed by numerical simulations.

Oral presentation

Numerical simulation of energy and angular distributions of scattered muons and bremsstrahlung photons in muon-catalyzed fusion experiment

Konishi, Ren*; Okutsu, Kenichi*; Kino, Yasushi*; Sasaki, Kyosuke*; Nakashima, Ryota*; Miyashita, Konan*; Yasuda, Kazuhiro*; Yamashita, Takuma*; Okada, Shinji*; Sato, Motoyasu*; et al.

no journal, ,

We are attempting to observe regenerative muons emitted from the surface of a solid hydrogen thin film by muon-catalyzed fusion by irradiating the film with muons that have the same charge as electrons and 207 times the mass of electrons. The main background factors in detecting regenerative muons are scattered muons from the accelerator, which are slowed down to the same level as regenerative muons by the target, and bremsstrahlung generated by the components of the device. The results show that there is little scattering within the solid hydrogen, and that the dominant slowing down process is at the Al foil upstream of the solid hydrogen target. The energy distribution of Bremsstrahlung at the X-ray detection position will be reported.

Oral presentation

Simulation of muon electrostatic transport for low energy muon extraction

Ikemoto, Megumi*; Somekawa, Jun*; Neki, Arata*; Konishi, Ren*; Nakashima, Ryota*; Okutsu, Kenichi*; Kino, Yasushi*; Yamashita, Takuma*; Okada, Shinji*; Sato, Motoyasu*; et al.

no journal, ,

We have been studying on muon beam quality improvement by moderating $mu^{-}$ generated by an accelerator with a thin Si film, and then decelerating and focusing the beam in an electrostatic field. In this study, numerical simulation of an experiment in which $mu^{-}$ of a few MeV is injected into a 0.5~mm thick Si plate and $mu^{-}$ , which is decelerated to a few keV, is extracted electrostatically is performed using charged particle orbit software (SIMION). The flight time to the end of the transport tube and the transport efficiency change with a slight shift of the muon launch position, suggesting that the muon transport process is sensitive to the initial conditions.

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Electrochemical reaction mechanisms under various charge-discharge operating conditions for Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in a lithium-ion battery

Mechanisms responsible for two possible electrochemical reactions in Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ used for lithium ion batteries

Structural changes in surface and bulk LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$ during electrochemical reaction on epitaxial thin-film electrodes characterized by X-ray scattering

Mechanistic study on lithium intercalation using a restricted reaction field in LiNi $_{0.5}$ Mn $_{0.5}$ O $_{2}$

TSC modelling of current ramp scenarios with ITB-Generated bootstrap currents in JT-60U reversed shear discharges

Numerical simulation of muon beam behavior in solid hydrogen

Numerical simulation for a experiment on slow muon detection from muon catalyzed fusion

Numerical simulation of energy and angular distributions of scattered muons and bremsstrahlung photons in muon-catalyzed fusion experiment

Simulation of muon electrostatic transport for low energy muon extraction