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Maeda K, Moritoki M, Yae S, Fukui K, Fukumuro N, Sugahara T. Pressure-induced evolution in the durability of nickel-metal hydride batteries under high-current charge. Phys Chem Chem Phys 2022; 24:14085-14091. [PMID: 35640620 DOI: 10.1039/d1cp05100h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We found that an AAA-type battery (min. 750 mAh) pressurized with Ar or N2 at pressures of up to 5 MPa exhibited a significant durability enhancement even under high-current conditions. As an example of a charge-discharge cycle test at 3 amperes, the residual ratio of capacity at atmospheric pressure decreased to approximately 90% of the standard capacity before 50 cycles. However, at a pressure of 3 MPa of N2, the capacity remained at more than 90% until 180 cycles. With an increase in the pressure, the residual ratio of capacity was further improved. It has been considered that, at the positive electrode of the Ni-MH battery, the chemical reaction from nickel(II) hydroxide (Ni(OH)2) crystals to nickel oxide hydroxide (NiOOH) crystals occurs during the charging process. However, X-ray diffraction (XRD) results in the present study do not support this solid-solid reaction between these two types of crystal. To address this contradiction, we propose a different reaction mechanism by introducing the concept of non-crystalline fine particles of compounds, which are undetected by XRD. This mechanism clearly explains how the pressure affects the durability improvement. Pressurized batteries, which are capable of fast charge-discharge operation under high-current conditions, can provide a new route for application fields of unconventional energy storage.
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Affiliation(s)
- Kouji Maeda
- Department of Chemical Engineering and Materials Science, University of Hyogo, 2167 Shosha, Himeji, 671-2201 Hyogo, Japan.
| | - Masato Moritoki
- Department of Chemical Engineering and Materials Science, University of Hyogo, 2167 Shosha, Himeji, 671-2201 Hyogo, Japan.
| | - Shinji Yae
- Department of Chemical Engineering and Materials Science, University of Hyogo, 2167 Shosha, Himeji, 671-2201 Hyogo, Japan.
| | - Keisuke Fukui
- Department of Chemical Engineering and Materials Science, University of Hyogo, 2167 Shosha, Himeji, 671-2201 Hyogo, Japan.
| | - Naoki Fukumuro
- Department of Chemical Engineering and Materials Science, University of Hyogo, 2167 Shosha, Himeji, 671-2201 Hyogo, Japan.
| | - Takeshi Sugahara
- Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University 1-3 Machikaneyama, Toyonaka, 560-8531 Osaka, Japan.,Division of Energy and Photochemical Engineering, Research Center for Solar Energy Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
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Machida H, Sugahara T, Hirasawa I. Supercooling suppression in the tetrahydrofuran clathrate hydrate formation. CrystEngComm 2022. [DOI: 10.1039/d2ce00645f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of silver(ii) oxide effectively diminishes the degree of supercooling in the tetrahydrofuran hydrate formation.
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Affiliation(s)
- Hironobu Machida
- Solution Development Division, Electric Works Company, Panasonic Corporation, 3-1-1 Yagumo-nakamachi, Moriguchi, Osaka 570-8501, Japan
| | - Takeshi Sugahara
- Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
- Division of Energy and Photochemical Engineering, Research Center for Solar Energy Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Izumi Hirasawa
- Department of Applied Chemistry, Waseda University, 3-4-1 Ohkubo, Shinjukuku, Tokyo 169-8555, Japan
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Sharma S, Kumar K, Chauhan S, Chauhan MS. Conductometric and spectrophotometric studies of self-aggregation behavior of streptomycin sulphate in aqueous solution: Effect of electrolytes. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111782] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Cheng C, Wang F, Zhang J, Qi T, Jin T, Zhao J, Zheng J, Li L, Li L, Yang P, Lv S. Cyclic Formation Stability of 1,1,1,2-Tetrafluoroethane Hydrate in Different SDS Solution Systems and Dissociation Characteristics Using Thermal Stimulation Combined with Depressurization. ACS OMEGA 2019; 4:11397-11407. [PMID: 31460244 PMCID: PMC6682015 DOI: 10.1021/acsomega.9b01187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 06/11/2019] [Indexed: 06/10/2023]
Abstract
Cold storage using hydrates for cooling is a high-efficiency technology. However, this technology suffers from problems such as the stochastic nature of hydrate nucleation, cyclic hydrate formation instability, and a low cold discharge rate. To solve these problems, it is necessary to further clarify the characteristics of hydrate formation and dissociation in different systems. First, a comparative experimental study in pure water and sodium dodecyl sulfate (SDS) solution systems was conducted to explore the influence of SDS on the morphology of the hydrate and the time needed for its formation under visualization conditions. Subsequently, the cyclic hydrate formation stability was investigated at different test temperatures with two types of SDS solution systems-with or without a porous medium. The induction time, full time, and energy consumption time ratio of the first hydrate formation process and the cyclic hydrate reformation process were analyzed. Finally, thermal stimulation combined with depressurization was used to intensify hydrate dissociation compared with single thermal stimulation. The results showed that the growth morphology of hydrate and the time required for its formation in the SDS solution system were obviously different than those in pure water. In addition, the calculation and comparison results revealed that the induction time and full time of cyclic hydrate reformation were shorter and the energy consumption time ratio was smaller in the porous medium. The results indicated that a porous medium could improve the cyclic hydrate formation process by making it more stable and by decreasing time and energy costs. Thermal stimulation combined with depressurization at different backpressures (0.1, 0.2, 0.3, and 0.4 MPa) effectively promoted the decomposition of hydrates, and with the decrease in backpressure, the dissociation time decreased gradually. At a backpressure of 0.1 MPa, the dissociation time was reduced by 150 min. The experimental results presented the formation and dissociation characteristics of 1,1,1,2-tetrafluoroethane hydrates in different systems, which could accelerate the application of gas hydrates in cold storage.
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Affiliation(s)
- Chuanxiao Cheng
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Fan Wang
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Jun Zhang
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Tian Qi
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Tingxiang Jin
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Jiafei Zhao
- Key
Laboratory of Ocean Energy Utilization and Energy Conservation of
Ministry of Education, Dalian University
of Technology, Dalian 116024, China
| | - Jili Zheng
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Lingjuan Li
- Henan
Muxiang Veterinary Pharmaceutical Company Limited, Zhengzhou 450000 China
| | - Lun Li
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Penglin Yang
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
| | - Shuai Lv
- School
of Energy and Power Engineering, Zhengzhou
University of Light Industry, Zhengzhou 450002, China
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Muromachi S, Takeya S. Thermodynamic Properties and Crystallographic Characterization of Semiclathrate Hydrates Formed with Tetra- n-butylammonium Glycolate. ACS OMEGA 2019; 4:7317-7322. [PMID: 31459831 PMCID: PMC6649264 DOI: 10.1021/acsomega.9b00422] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 03/22/2019] [Indexed: 06/10/2023]
Abstract
Semiclathrate hydrates are a crystalline host-guest material, which forms with water and ionic substances such as tetra-n-butylammonium (TBA) salts. Various anions can be used as a counter anion to the TBA cation, and they can modify thermodynamic properties of the semiclathrate hydrates, which are critical for applications, for example, cold energy storage and gas separation. In this study, the semiclathrate hydrates of the TBA glycolate were newly synthesized. Measurements for melting temperatures and a heat of fusion and a crystal structure analysis were performed. In comparison with the other similar materials, such as acetates, propionates, lactates, and hydroxybutyrates, the glycolate greatly changed the melting temperature and the heat of fusion. The preliminarily determined crystal structure showed that the glycolate anion builds a relatively porous structure compared to the previously reported hydrates formed with hydroxycarboxylates. The present study showed that substitution of a hydrophobic group by a hydrophilic group is an effective method to control the thermodynamic properties as well as to improve environmental, biological, and chemical properties.
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Affiliation(s)
- Sanehiro Muromachi
- Research
Institute of Energy Frontier (RIEF), National
Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba 305-8569, Japan
| | - Satoshi Takeya
- National
Metrology Institute of Japan (NMIJ), National
Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
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