The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Dal-mo Kang - One of the best experts on this subject based on the ideXlab platform.
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Prediction of thermal behaviors of an air-cooled lithium-ion Battery System for hybrid electric vehicles
Journal of Power Sources, 2014Co-Authors: Yong-seok Choi, Dal-mo KangAbstract:Thermal management has been one of the major issues in developing a lithium-ion (Li-Ion) hybrid electric vehicle (HEV) Battery System since the Li-Ion Battery is vulnerable to excessive heat load under abnormal or severe operational conditions. In this work, in order to design a suitable thermal management System, a simple modeling methodology describing thermal behavior of an air-cooled Li-Ion Battery System was proposed from vehicle components designer's point of view. A proposed mathematical model was constructed based on the Battery's electrical and mechanical properties. Also, validation test results for the Li-Ion Battery System were presented. A pulse current duty and an adjusted US06 current cycle for a two-mode HEV System were used to validate the accuracy of the model prediction. Results showed that the present model can give good estimations for simulating convective heat transfer cooling during Battery operation. The developed thermal model is useful in structuring the flow System and determining the appropriate cooling capacity for a specified design prerequisite of the Battery System.
Xinhong Zhou - One of the best experts on this subject based on the ideXlab platform.
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Tracing the Impact of Hybrid Functional Additives on a High-Voltage (5 V-class) SiOx-C/LiNi0.5Mn1.5O4 Li-Ion Battery System
Chemistry of Materials, 2018Co-Authors: Xiao Wang, Xuehui Shangguan, Suqi Huang, Bingbing Chen, Shanmu Dong, Xinhong ZhouAbstract:The development of next generation high energy density lithium ion batteries (LIBs) adopting electrode materials with higher specific capacity or higher working voltage has attracted great interest...
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Tracing the Impact of Hybrid Functional Additives on a High-Voltage (5 V‑class) SiOx‑C/LiNi0.5Mn1.5O4 Li-Ion Battery System
2018Co-Authors: Xiao Wang, Xuehui Shangguan, Suqi Huang, Bingbing Chen, Shanmu Dong, Xinhong ZhouAbstract:The development of next generation high energy density lithium ion batteries (LIBs) adopting electrode materials with higher specific capacity or higher working voltage has attracted great interest. In this paper, fluoroethylene carbonate (FEC) and 1,3-propanediolcyclic sulfate (PCS) are unprecedentedly combined as hybrid functional additives to significantly improve the performances of a very challenging next-generation high voltage (5 V-class) SiOx-C/LiNi0.5Mn1.5O4 Battery System, where SiOx-C composite shows a high specific capacity of 450 mAh g–1 and LiNi0.5Mn1.5O4 has a high working voltage plateau (∼4.7 V vs Li+/Li). Combining in situ differential electrochemical mass spectrometry (DEMS) technology, theoretical calculations, and conventional ex situ characterizations, it is revealed that small amounts of lithium-containing species (such as LiF, sulfate species, and organic sulfite species) with excellent electronic-insulating, ionic-conducting, and compact properties are derived from prior decomposition of additives and incorporated into the solid electrolyte interface (SEI) layer of SiOx-C electrode, suppressing the reductive decomposition of carbonate solvents as well as the gas generation (C2H4, CO2, and H2). Moreover, hybrid functional additives are beneficial for forming a compact and homogeneous cathode SEI layer, alleviating dissolution of transition metals, structure degradation, and loss of active lithium. This manuscript provides a very useful research method for understanding the working mechanism of functional additives and will also help us to depict the SEI layer formation mechanism more accurately
Puttaswamy Rangaswamy - One of the best experts on this subject based on the ideXlab platform.
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Enhanced electrochemical performance of LiVPO_4F/f-graphene composite electrode prepared via ionothermal process
Journal of Applied Electrochemistry, 2017Co-Authors: Puttaswamy Rangaswamy, Vijeth Rajshekar Shetty, Gurukar Shivappa Suresh, Kittappa Malavalli Mahadevan, Doddahalli Hanumantharayudu NagarajuAbstract:In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO_4F electrode material. Structural and morphological features of LiVPO_4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO_4F is modified to LiVPO_4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO_4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-Ions. This article also provides the comparative electrochemical performances of LiVPO_4F/f-graphene composite, LiVPO_4F/carbon, and LiVPO_4F/graphene composite electrodes in a nonaqueous rechargeable Li-Ion Battery System. Graphical Abstract
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Enhanced electrochemical performance of LiVPO_4F/f-graphene composite electrode prepared via ionothermal process
Journal of Applied Electrochemistry, 2017Co-Authors: Puttaswamy Rangaswamy, Vijeth Rajshekar Shetty, Gurukar Shivappa Suresh, Kittappa Malavalli Mahadevan, Doddahalli Hanumantharayudu NagarajuAbstract:In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO_4F electrode material. Structural and morphological features of LiVPO_4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO_4F is modified to LiVPO_4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO_4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-Ions. This article also provides the comparative electrochemical performances of LiVPO_4F/f-graphene composite, LiVPO_4F/carbon, and LiVPO_4F/graphene composite electrodes in a nonaqueous rechargeable Li-Ion Battery System. Graphical Abstract
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Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process
Journal of Applied Electrochemistry, 2016Co-Authors: Puttaswamy Rangaswamy, Vijeth Rajshekar Shetty, Gurukar Shivappa Suresh, Kittappa Malavalli Mahadevan, Doddahalli Hanumantharayudu NagarajuAbstract:In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO4F electrode material. Structural and morphological features of LiVPO4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO4F is modified to LiVPO4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-Ions. This article also provides the comparative electrochemical performances of LiVPO4F/f-graphene composite, LiVPO4F/carbon, and LiVPO4F/graphene composite electrodes in a nonaqueous rechargeable Li-Ion Battery System.
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A new tavorite LiTiPO_4F electrode material for aqueous rechargeable lithium ion Battery
Journal of Solid State Electrochemistry, 2016Co-Authors: Puttaswamy Rangaswamy, Gurukar Shivappa Suresh, Mahadevan Malavalli KittappaAbstract:Herein, we demonstrate a safe, inexpensive, and stable cycle-life aqueous rechargeable Li-Ion Battery System using tavorite LiTiPO_4F as anode and Li[Li_0.2Co_0.3Mn_0.5]O_2 as cathode in aqueous electrolyte using 2 M Li_2SO_4. These materials have been synthesized via a simple and an efficient method called RAPET (reaction under autogenic pressure at elevated temperature) method, and for the first time, we have evaluated the electrochemical properties of LiTiPO_4F in aqueous electrolyte. Structural and morphological features have been characterized using X-ray diffraction and scanning electron microscopy techniques, and the electrochemical studies have been investigated by using cyclic voltammetry, galvanostatic charge/discharge studies, electrochemical impedance spectroscopic technique, potentiostatic intermittent titration techniques, and galvanostatic intermittent titration techniques. In galvanostatic charge/discharge studies, the capacity, cycle life, and columbic efficiency of LiTiPO_4F have been tested in combination with Li [Li_0.2Co_0.3Mn_0.5]O_2 cathode. In particular, LiTiPO_4F shows capacity of 82 mA h g^−1, the capacity retention was maintained 90 % even after the 45th cycle.
Doddahalli Hanumantharayudu Nagaraju - One of the best experts on this subject based on the ideXlab platform.
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Enhanced electrochemical performance of LiVPO_4F/f-graphene composite electrode prepared via ionothermal process
Journal of Applied Electrochemistry, 2017Co-Authors: Puttaswamy Rangaswamy, Vijeth Rajshekar Shetty, Gurukar Shivappa Suresh, Kittappa Malavalli Mahadevan, Doddahalli Hanumantharayudu NagarajuAbstract:In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO_4F electrode material. Structural and morphological features of LiVPO_4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO_4F is modified to LiVPO_4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO_4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-Ions. This article also provides the comparative electrochemical performances of LiVPO_4F/f-graphene composite, LiVPO_4F/carbon, and LiVPO_4F/graphene composite electrodes in a nonaqueous rechargeable Li-Ion Battery System. Graphical Abstract
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Enhanced electrochemical performance of LiVPO_4F/f-graphene composite electrode prepared via ionothermal process
Journal of Applied Electrochemistry, 2017Co-Authors: Puttaswamy Rangaswamy, Vijeth Rajshekar Shetty, Gurukar Shivappa Suresh, Kittappa Malavalli Mahadevan, Doddahalli Hanumantharayudu NagarajuAbstract:In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO_4F electrode material. Structural and morphological features of LiVPO_4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO_4F is modified to LiVPO_4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO_4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-Ions. This article also provides the comparative electrochemical performances of LiVPO_4F/f-graphene composite, LiVPO_4F/carbon, and LiVPO_4F/graphene composite electrodes in a nonaqueous rechargeable Li-Ion Battery System. Graphical Abstract
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Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process
Journal of Applied Electrochemistry, 2016Co-Authors: Puttaswamy Rangaswamy, Vijeth Rajshekar Shetty, Gurukar Shivappa Suresh, Kittappa Malavalli Mahadevan, Doddahalli Hanumantharayudu NagarajuAbstract:In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO4F electrode material. Structural and morphological features of LiVPO4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO4F is modified to LiVPO4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-Ions. This article also provides the comparative electrochemical performances of LiVPO4F/f-graphene composite, LiVPO4F/carbon, and LiVPO4F/graphene composite electrodes in a nonaqueous rechargeable Li-Ion Battery System.
Tetsuya Kato - One of the best experts on this subject based on the ideXlab platform.
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Proposal of a novel control method of Li-Ion Battery System for regenerative energy utilization in traction power supply System
2016 IEEE International Power Electronics and Motion Control Conference (PEMC), 2016Co-Authors: Hitoshi Hayashiya, Masami Hino, Yuuki Iino, Katsutoshi Nakao, Hiroshi Ikarashi, Haruo Nemoto, Hironori Kawatsu, Tetsuya KatoAbstract:To make use of residual regenerative energy in d.c. traction power supply System, some energy storage Systems have already installed in Japan. We, East Japan Railway Company, also installed two Lithium ion Battery Systems at Haijima Substation in 2013 and at Okegawa Substation in 2014, respectively. They contributed to reduce traction power supply from substation about 5-8% annually. Because the load of railway operation is heavy during the rush hour time in the morning and in the evening and light during the daytime, it is difficult to set appropriate control parameters for charging and discharging the Battery System to be effective both during the rush hour and during the daytime. To solve this problem, the control parameters are changed depending on the time in our second installation of energy storage System at Okegawa. In this method, however, the parameter change is scheduled in advance and the System is able to accept the change of the receiving voltage influence by the grid condition. To make the System more effective, a novel control method to change parameters depending on the load condition moment by moment. By introducing this method, it is possible to change the control parameters flexibly even when the receiving voltage from the gird is changed. The effectiveness of the proposed method is shown, in this paper, based on the measured data at Okegawa Substation.
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Lithium-ion Battery installation in traction power supply System for regenerative energy utilization: Initial report of effect evaluation after half a year operation
16th International Power Electronics and Motion Control Conference and Exposition PEMC 2014, 2014Co-Authors: Hitoshi Hayashiya, Masateru Tojo, Hidetoshi Okamoto, Masami Hino, Tetsuya Kato, Daisuke Hara, Hirotaka Takahashi, Takashi Suzuki, Koichi Watanabe, Masato TeshimaAbstract:Previously, some energy storage Systems were installed to compensate for voltage drop and to avoid regenerative brake cancelation in d.c. 750V and 1.5kV traction power supply System in Japan. The fly wheel and Lithium-ion (Li-Ion) Battery, nickel metal hydride (Ni-MH) Battery and electric double layer capacitor (EDLC) were used as a storage device. In East Japan Railway Company, Li-Ion Battery System was installed at HAIJIMA Substation (SS) on Ome Line and started operation on February 20th, 2013. It is the first application of the energy storage System mainly not for voltage drop compensation but for regenerative energy utilization. In this paper, the effect of Li-Ion Battery System installed at HAIJIMA SS is evaluated based on the measured data during the practical operation and it is shown that it contributes to more than 5% reduction of total traction power supply at HAIJIMA Substation. The future plan of energy storage application is also mentioned.