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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

 Times Cited Count:6 Percentile:51.04(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

 Times Cited Count:7 Percentile:57.15(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 ${it in situ}$ X-ray scattering

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

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

 Times Cited Count:30 Percentile:74.87(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

 Times Cited Count:21 Percentile:58.03(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 ${it in situ}$ 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

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