著者

辻村 浩行 伊藤 靖彦

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.84, no.4, pp.263-268, 2016-04-05 (Released:2016-04-05)

参考文献数

15

被引用文献数

4

著者

Tadao SATO Sigeo TODA Tetsuhei TACHIKAWA

出版者

The Electrochemical Society of Japan

雑誌

電気化学および工業物理化学 (ISSN:03669297)

巻号頁・発行日

vol.55, no.8, pp.617-620, 1987-08-05 (Released:2019-09-30)

被引用文献数

2 5

著者

Kota MOTOHASHI Takanori SANADA Takashi NAKAMURA Yuta KIMURA Yoshiharu UCHIMOTO Koji AMEZAWA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.22-00114, (Released:2022-10-27)

被引用文献数

1

著者

Quanyi LIU Qian ZHU Wentian ZHU Xiaoying YI

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.90, no.8, pp.087003, 2022-08-05 (Released:2022-08-05)

参考文献数

31

被引用文献数

1 5

---

With the improvement of lithium-ion batteries in civil aviation transportation, the thermal safety of lithium-ion batteries can not be ignored. Especially in a battery pack, the thermal runaway of batteries can spread from cell to cell, resulting in catastrophic hazards. This work focuses on the experimental setup and analysis of the experimental parameters of lithium-ion batteries with different thicknesses of aerogel felt to study the blocking effect of barrier materials on thermal runaway propagation of lithium-ion batteries in civil aviation transport. The aerogel felt was selected as the barrier material and a series of experiments were carried out with different thicknesses of 1 mm, 3 mm, and 6 mm. The results demonstrated that the increase of aerogel felt thickness exhibited excellent performance in delaying lithium-ion battery thermal runaway. Additionally, a simplified thermal model of thermal runaway propagation was proposed to explain the thermal runaway propagation in the battery to adjacent batteries. These results provide valuable suggestions and enlightenment for the aviation safety transportation of lithium-ion batteries.

著者

Quanyi LIU Qian ZHU Wentian ZHU Xiaoying YI Xu HAN

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.90, no.8, pp.087004, 2022-08-05 (Released:2022-08-05)

参考文献数

21

被引用文献数

1 5

---

To better understand the thermal runaway characteristics of lithium-ion batteries in civil aviation transportation environments, an experimental platform for the fire and explosion of lithium-ion batteries was designed and built. The 18650 NCM lithium-ion battery was selected as the test sample to study the influence of different initial pressures on the thermal runaway characteristics of the lithium-ion battery pack in a confined space. The results showed that, under 61 kPa, the initial thermal runaway triggering time is longer, the initial thermal runaway temperature is higher, and the explosion pressure and TNT equivalent are lower than that under 96 kPa. The mass loss increased with the increase of pressure and the number of batteries. In addition, the initial thermal runaway triggering time and temperature are affected by the number of batteries. These results could provide some support for civil aviation transportation safety.

著者

宮代 一 小林 陽 中村 龍哉 関 志朗 三田 裕一 宇佐美 章

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.74, no.4, pp.321-325, 2006-04-05 (Released:2012-03-20)

参考文献数

23

被引用文献数

2 4

---

Olivine structured LiFePO4 cathode is the promising cathode active material for lithium secondary batteries due to its low cost and quite excellent reversibility. On the other hand, lithium polymer secondary batteries (LPBs) have been studied for the purpose of large-scaled batteries (for example, electric power load leveling). In this study, we prepared LPBs using the LiFePO4 cathode. By measuring the charge-discharge properties and electrochemical impedance spectroscopy, basic properties were investigated compared with the LPBs using the 4V-class LiCoO2 cathode.

著者

Igseon GU Takuya ISHIDA Tetsu TATSUMA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.90, no.7, pp.077006, 2022-07-09 (Released:2022-07-09)

参考文献数

40

被引用文献数

2

---

Chiral plasmonic nanostructures attract much attention because of their potential applications to advanced optical materials and enantioselective sensors. However, the latter has been fabricated on the basis of top-down methods, which take time and cost. Here we developed a one-step method for preparation of chiral gold nanostructures immobilized on an electrode by a simple electrodeposition in the presence of L- or D-cysteine. Opposite circular dichroism (CD) spectra were obtained by using L- or D-cysteine, while achiral structures were deposited for racemic cysteine or in the absence of cysteine. The chirality was attributed to geometries of the nanostructures. Chiral gold nanostructures electrodeposited in the presence of L-cysteine gave higher CD signals to (S)-enantiomer than those to (R)-enantiomer of 1,2-propanediol, and vice versa. TiO2-coated electrodes were also used as a substrate for the electrodeposition of chiral nanostructures, so that the chiral plasmonic electrodes would be employed for optoelectronic and photoelectrochemical applications.

著者

Shingo OKUBO Yoshihisa OZEKI Tetsuya YAMADA Kosuke SAITO Noboru ISHIHARA Yasuko YANAGIDA Gen MAYANAGI Jumpei WASHIO Nobuhiro TAKAHASHI

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.22-00020, (Released:2022-05-31)

被引用文献数

5

著者

Igseon GU Takuya ISHIDA Tetsu TATSUMA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.22-00046, (Released:2022-05-17)

被引用文献数

2

著者

Ryoichi TATARA Yukihiro OKAMOTO Yosuke UGATA Kazuhide UENO Masayoshi WATANABE Kaoru DOKKO

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.89, no.6, pp.590-596, 2021-11-05 (Released:2021-11-05)

参考文献数

43

被引用文献数

3

---

The performance of a sodium-ion (Na) battery is significantly influenced by its electrolyte characteristics. In particular, the transport properties of the electrolyte have considerable effects on the discharge rate capability. During discharging of a Na battery at high current densities, a concentration gradient of Na salt develops because both cations and anions are mobile in the liquid electrolyte. Concentration polarization can be suppressed by increasing the Na+ transference number (tNa+) of the electrolyte. This study demonstrates that highly concentrated NaN(SO2F)2 dissolved in 3-methylsulfolane (MSL) exhibits a high tNa+ value of >0.6 under anion-blocking conditions. Raman spectroscopy revealed that Na+ ions formed complexes with MSL and anions in the electrolyte. Na+ ions exchange ligands dynamically and move faster than the ligands, resulting in a high tNa+. The high tNa+ enables a high-rate discharge of the Na battery, despite the low ionic conductivity of the highly concentrated electrolyte.

著者

Hiroyuki UEDA Katsuhiko NISHIYAMA Soichiro YOSHIMOTO

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.86, no.5, pp.217-219, 2018-09-05 (Released:2018-09-05)

参考文献数

22

被引用文献数

5 8

---

The electrochemical behavior and specific adsorption of an ionic liquid, 1-butyl-3-methylimidazolium iodide, on a Au(111) electrode surface were investigated via voltammetric analyses, X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). The electrochemical potential window and the reductive desorption of I adatoms were evaluated using voltammetric techniques. The XPS and STM results supported the specific adsorption of I adatoms on Au(111). Furthermore, high-resolution STM images revealed the formation of characteristic nanostructured rings consisting of imidazolium cations on I adatoms for the first time.

著者

Yuto NAKAMURA Yasushi SATO Naoki SHIDA Mahito ATOBE

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.21-00053, (Released:2021-05-12)

参考文献数

27

被引用文献数

1

---

In this study, we report one step electrochemical trimerization of catechol to 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) for the first time. Electrochemical trimerization was demonstrated in a flow microreactor, which offers advantages for reaction screening owing to short reaction time and small reaction scale, as well as avoiding the further oxidation of HHTP. The use of 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a solvent was essential for the efficient production of HHTP. Computational simulation, pKa calculation, and electrochemical measurements gave some important insights into the mechanism of the electrochemical oxidation of catechol in HFIP.

著者

Kazunari MIYAZAKI Yidan DING Hiroki MUROYAMA Toshiaki MATSUI Koichi EGUCHI

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.88, no.1, pp.28-33, 2020-01-05 (Released:2020-01-05)

参考文献数

33

被引用文献数

1 9

---

In this study, the applicability of Ba(Ce,Co,Y)O3−δ (BCCY) for a cathode of proton-conducting ceramic fuel cells was investigated. The electrical conductivity and transference number of BCCY were significantly affected by a cobalt content in the oxide. It was found that this material showed a mixed conduction of proton, oxide ion, and electron. The addition of cobalt into Ba(Ce,Y)O3−δ mainly increased the electronic conductivity of materials. Composite electrodes with an optimum composition of La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF)–BaCe0.7Co0.2Y0.1O3−δ (50:50 wt.%) exhibited lower polarization for the symmetrical cell test with a BaCe0.8Y0.2O3−δ electrolyte in 6.5% humidified oxygen atmosphere, as compared with La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) itself and LSCF–BaCe0.9Y0.1O3−δ (50:50 wt.%) composite electrodes. The power generation test was performed at 600°C–700°C using a BaCe0.8Y0.2O3−δ electrolyte-supported single cell employing a LSCF–BaCe0.7Co0.2Y0.1O3−δ (50:50 wt.%) composite cathode, upon feeding 3% humidified hydrogen and pure oxygen to the anode and cathode, respectively. The cell with a LSCF–BaCe0.7Co0.2Y0.1O3−δ (50:50 wt.%) composite cathode exhibited much higher performance than that with a LSCF electrode. Consequently, the introduction of cobalt into Ba(Ce,Y)O3−δ was an effective strategy for an improvement in an oxygen reduction reaction activity of a cathode material.

著者

Yuta KIMURA Keita FUNAYAMA Mahunnop FAKKAO Takashi NAKAMURA Naoaki KUWATA Tatsuya KAWADA Junichi KAWAMURA Koji AMEZAWA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.21-00033, (Released:2021-03-16)

被引用文献数

6

著者

Toshiyuki NOHIRA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.20-00098, (Released:2020-09-15)

参考文献数

82

被引用文献数

2

---

In this paper, the author describes several new electrochemical reactions in molten salts (MSs) and ionic liquids (ILs), which includes the development of new ILs, and their applications. First, the electrochemical reduction of solid SiO2 to Si in molten CaCl2 at 1123 K is mentioned. The author explains the mechanism how the insulating SiO2 is electrochemically reduced to silicon. A new production method of solar grade silicon (SOG-Si) is introduced as one of the promising applications of the electrochemical reduction of SiO2. The author also mentions another new production method of SOG-Si which utilizes a liquid Si–Zn cathode in molten CaCl2. Secondly, the author describes the electrodeposition of silicon and titanium from water-soluble KF–KCl MSs. Compact crystalline Si films are electrodeposited from molten KF–KCl–K2SiF6 at 923 K. When K2TiF6 and Ti are added in molten KF–KCl, Ti(III) ions are produced by the proportionation reaction between Ti(IV) and Ti(0), in which compact Ti films can be electrodeposited. Thirdly, the author describes the binary and ternary mixtures of M[TFSA] (M = Li, Na, K, Rb, and Cs; TFSA = bis(trifluoromethylsulfonyl)amide) ILs as a new class of electrolytes for Li-ion batteries (LIBs) and Na-ion batteries (NIBs) operating in the intermediate temperature range. Fourthly, the development of binary and ternary mixtures of M[FSA] (M = Li, Na, K, Rb, and Cs; FSA = bis(fluorosulfonyl)amide) ILs and their applications for NIBs are mentioned; the binary and ternary mixtures of M[FSA] are unique in the points that they are inorganic compounds and have low melting temperatures. Finally, the author explains the development of several binary mixtures of M[FSA]–[Ocat][FSA] (M = Li, Na, and K; Ocat = organic cations) ILs which can be used for LIBs, NIBs, and KIBs (K-ion batteries). As a typical application of the M[FSA]–[Ocat][FSA] ILs, the development of practical NIB with a capacity of 27 Ah is described.

著者

Akira KOTANI Hikaru YANAI Takashi MATSUMOTO Hideki HAKAMATA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.20-65154, (Released:2021-01-13)

被引用文献数

5

著者

Takao ESAKA Salmie Suhana Binti Che Abdullah

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.78, no.11, pp.907-911, 2010-11-05 (Released:2012-03-26)

参考文献数

26

被引用文献数

2 4

---

In order to find a new type of oxide ion conductor, the electrical conduction was measured in the substituted perovskite-type oxides. In the present case, LaYO3 was used as a based material with an orthorhombic and comparatively large unit cell, and a novel substitution method was introduced to intend to increase the concentration of oxide ions, e.g., LaY1−xZrxO3+x/2. As a result, the LaYO3-based perovskite-type solid solution was found to be formed, where the enhanced oxide ion conduction was observed as compared with that of the based material. A typical sample was LaY0.95Zr0.05O3.025, the ionic conduction of which was 1.2×10−2 S cm−1 at 1000°C. Another substitution method of La1−xZrxYO3+x/2 resulted in the analogous result. Considering these results and the further structural and density measurements, the charge carriers in these phases were expected to be due to interstitial oxide ions.

著者

Noriko KASAI Ryota FUJISHIMA Naoya ISHIDA Naoto KITAMURA Yasushi IDEMOTO

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

pp.20-00126, (Released:2020-11-21)

参考文献数

28

被引用文献数

1

---

We studied the average crystal structural change during charging and discharging of a 0.4Li2MnO3-0.6LiMn1/3Ni1/3Co1/3O2 battery cathode in combination with a Li-metal anode, graphite anodes, and three types of separators. Prelithiation of the graphite anode enabled stable charge and discharge of the cathode. The average structure of the cathode after the 5th discharge did not change significantly due to the difference in the anodes and separators. However, after the 55th discharge, the difference in the electron density distribution and the distortion of the M-O6 octahedra for the different separators increased. The findings suggest that the changes in the crystal structure of a cathode over a long-term cycle should be studied with the anodes and separators used in actual batteries rather than Li-metal anodes and conventional separators.

著者

Isao SHITANDA Kengo KUMAGAI Chihomi TAKAMI Yoshinao HOSHI Masayuki ITAGAKI

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.89, no.1, pp.54-58, 2021-01-05 (Released:2021-01-05)

参考文献数

22

被引用文献数

1 2

---

Tin-plated copper tubes have been widely used in cold and hot water service systems. However, leakage accidents caused by pitting corrosion can occur in such tubes; therefore, it is necessary to evaluate the effects of major environmental factors on the occurrence of local corrosion to ultimately suppress this corrosion. In the present study, the anodic polarization curves of a tin-coated copper electrode were measured in simulated freshwater containing Cl−, SO42−, and HCO3−. The anodic current increased suddenly and sharply due to the breakdown of the passive layer and the initiation and growth of pitting generation at the pitting potential. The pitting potential shifted to a more negative direction with increasing Cl− and SO42− concentrations. In contrast, the pitting potential shifted to more noble potentials upon increasing the HCO3− concentration, indicating that HCO3− has an inhibitory effect on pitting attack by Cl− and SO42−. The quantitative relationship between each anion concentration and the pitting potential was determined by multiple regression analysis. A plot of the pitting potential predicted from the created regression equation and the measured values of the pitting potential showed a positive linear relationship.

著者

Shigenori MITSUSHIMA Yuki KOIZUMI Ken-ichiro OTA Nobuyuki KAMIYA

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.75, no.2, pp.155-158, 2007-02-05 (Released:2012-03-20)

参考文献数

19

被引用文献数

7 13

---

Platinum depositions have been observed in the electrolyte membrane of polymer electrolyte fuel cells (PEFCs) as in other types of fuel cells; PEFCs, MCFCs. The platinum solubility in the membrane must be a key issue to improve and guarantee the durability of PEFCs. In this basic study, the platinum solubility has been determined in an acidic medium as a function of temperature, pH, and potential which was controlled by the oxygen partial pressure. The solubility was 3.0×10−6 mol dm−3 at 23°C in 1 mol dm−3 H2SO4 under air, and increased with temperature and the decrease in pH. The platinum solubility slightly increased with the oxygen partial pressure in oxygen–nitrogen mixtures. However, the solubility in nitrogen was much smaller than the mixtures. Based on these results, the dissolution of platinum in an acidic medium would follow the acidic dissolution mechanism.