• 제목/요약/키워드: Hybrid supercapacitor

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A Study on the Hybrid Fuel Cell System by using supercapacitor (수퍼커패시터를 이용한 하이브리드 연료전지시스템에 관한 연구)

  • Yoon, Seong-Sik;Choi, Won-Muk;Kim, Sung-Hoon;Kim, Tea-Kue;Ahn, Ho-Gyun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 한국해양정보통신학회 2011년도 춘계학술대회
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    • pp.589-592
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    • 2011
  • In this paper, bidirectional DC-DC converter is designed to cover up defects of fuel cell generating system like as low dynamic characteristic, unstable output and lack of storage ability by using bidirectional DC-DC Converter and supercapacitor that available to charge & discharge quickly, high efficient at charge & discharge and semi-permanent. Operating efficiency has been analyzed through simulation and examination. According to these design and data, hybrid system has been made and operation test, evaluation and results evaluation have been performed.

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Compound-Type Hybrid Energy Storage System and Its Mode Control Strategy for Electric Vehicles

  • Wang, Bin;Xu, Jun;Cao, Binggang;Li, Qiyu;Yang, Qingxia
    • Journal of Power Electronics
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    • 제15권3호
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    • pp.849-859
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    • 2015
  • This paper proposes a novel compound-type hybrid energy storage system (HESS) that inherits the unique advantages of both battery/supercapacitor (SC) and the SC/battery HESSs for electric vehicles (EVs). Eight operation modes are designed to match this system. A mode control strategy is developed for this HESS on the basis of these modes, and five classes of operation modes are established to simplify this strategy. The mode control strategy focuses on high operating efficiency and high power output. Furthermore, the compound-type HESS is designed such that the SC is the main priority in braking energy absorption. Thus, this HESS can operate efficiently and extend battery life. Simulation results also show that the compound-type HESS can not only supply adequate power to the motor inverter but can also determine suitable operation modes in corresponding conditions. Experimental results demonstrate that this HESS can extend battery life as well. The overall efficiency of the compound-type HESS is higher than those of the battery/SC and the SC/battery HESSs.

A High Efficiency Converter for Battery Hybrid Power System of Electric Vehicles (전기자동차의 배터리 하이브리드 전원시스템용 고효율 컨버터)

  • Tran, Dai-Duong;Lee, Hyun-Hwa;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 전력전자학회 2016년도 전력전자학술대회 논문집
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    • pp.333-334
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    • 2016
  • This paper proposes a new cascoded configuration for hybrid energy storage system (HESS) which consists of batteries and supercapacitor (SC) for Electric Vehicle applications. In this configuration,a resonant LLC converter is interfacedin series with a battery module and it converts a part of the energy from the batteries and transfer it to the dc-link bus. The LLC converter is controlled by a phase-shift angle between the primary and secondary switches to maintain a constant dc-link voltage and obtain soft-switching conditions for all the primary switches. By placing the SC moduleina cascoded concept, the rated voltage of SC can be reduced significantly compared with the conventional topologies. It helps save the cost and reduce the number of SC cells. The proposed configuration can operate with four different modes: feeding load, acceleration, regenerative braking andSC charging. A scaled-down prototype converter (2 kW, 600V output) is designed and tested to verify the advantages of the proposed topology. The maximum efficiency obtained with the proposed topology is 99%.

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Optimization of Capacitance Balance for a Hybrid Supercapacitor Consisted of LiMn2O4/AC as a Positive and AC Negative Electrode

  • Cho, Min-Young;Park, Sun-Min;Lee, Jae-Won;Roh, Kwang-Chul
    • Journal of Electrochemical Science and Technology
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    • 제2권3호
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    • pp.152-156
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    • 2011
  • A hybrid supercapacitor is fabricated using a composite material from $LiMn_2O_4$ (LMO) and activated carbon (AC) as the positive electrode and AC as the negative electrode to form the (LMO + AC)/AC system. Volume ratio (positive : negative) of electrodes is controlled to investigate of the power and energy balance. The (LMO + AC)/AC system shows better performances than the LMO/AC system. Especially, electrochemical impedance spectra, rate charge.discharge and cycle performance testing show that the (LMO + AC)/AC system have an outstanding electrochemical performance at volume ratios of (LMO + AC)/AC = 1 : 1.7 and 1 : 2. Electric double layer capacitor (EDLC) capacitance between AC of the positive electrode and AC of the negative electrode improves power density without loss of capacitance. Stable capacitance is achieved by lowering the positive electrode resistance and balancing the energy and power densities between the positive and negative electrodes by the addition of AC to the positive electrode at high current density.

An Overview of Self-Grown Nanostructured Electrode Materials in Electrochemical Supercapacitors

  • Shinde, Nanasaheb M.;Yun, Je Moon;Mane, Rajaram S.;Mathur, Sanjay;Kim, Kwang Ho
    • Journal of the Korean Ceramic Society
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    • 제55권5호
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    • pp.407-418
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    • 2018
  • Increasing demand for portable and wireless electronic devices with high power and energy densities has inspired global research to investigate, in lieu of scarce rare-earth and expensive ruthenium oxide-like materials, abundant, cheap, easily producible, and chemically stable electrode materials. Several potential electrode materials, including carbon-based materials, metal oxides, metal chalcogenides, layered metal double hydroxides, metal nitrides, metal phosphides, and metal chlorides with above requirements, have been effectively and efficiently applied in electrochemical supercapacitor energy storage devices. The synthesis of self-grown, or in-situ, nanostructured electrode materials using chemical processes is well-known, wherein the base material itself produces the required phase of the product with a unique morphology, high surface area, and moderate electrical conductivity. This comprehensive review provides in-depth information on the use of self-grown electrode materials of different morphologies in electrochemical supercapacitor applications. The present limitations and future prospects, from an industrial application perspectives, of self-grown electrode materials in enhancing energy storage capacity are briefly elaborated.

Regenerative Energy Characteristics of Battery and Supercapacitor in a PEMFC Hybrid System

  • Kim, Byeong Heon;Wei, Qingsheng;Oh, Byeong Soo
    • Journal of Power System Engineering
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    • 제21권4호
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    • pp.5-17
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    • 2017
  • This study focuses on the application of the PEM Fuel Cell(PEMFC) hybrid system, which includes a regenerative braking system with supercapacitor(SC) and battery. The purpose of this study is to evaluate the characteristics of regenerative energy and to propose solutions to increase regenerative energy via vehicle simulation. To achieve this target, we set the rated motor speed to 3,000/2,500/2,000 rpm. Because the flywheel is directly connected to the motor, the generator activates regenerative braking by using the rotational momentum of the flywheel when the flywheel reaches the set speed after the motor stops. We could then measure the characteristics of regenerative braking of voltage, current, power, energy change, etc. Meanwhile, we calculate the storage efficiency of the SC or the battery. Our results show that the SC stores 18% of the regenerative energy, while battery stores 15% of the energy. Since the regenerative energy decreases with the decrease of the motor rotating speed that 5,027 J and 2,915 J are restored at 3,000 and 2,500 rpm, respectively. The experimental results also prove that regenerative braking energy is able to be obtained if and only if the speed of flywheel is over 2,500 PRM, and the efficiency of the system can be further improved.

Improving the Efficiency for Hybrid Battery Combining Super Capacitor (슈퍼 커패시터를 결합한 하이브리드 전지의 효율 개선)

  • Jee, Seung-Hyun;Kim, Soo-Ho;Kim, Ju-Sun;Yoon, Young-Soo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • 제20권5호
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    • pp.410-414
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    • 2007
  • To prevent degradation of battery efficiency generated by serious current variation in rechargeable batteries, we researched a hybrid battery combining a super capacitor and a rechargeable battery. The hybrid battery shows high efficiency in a lifetime and a voltage drop. The hybrid battery was composed of a rechargeable battery, a current regulator and a super capacitor that can be used with supporting power. Before the experiment, the hybrid battery was simulated for current regulation and an electric current in a super capacitor by using the Pspice program. After that, we compared the efficiency of the hybrid battery with the efficiency of the normal battery. In this result, we demonstrated that the hybrid battery has a higher efficiency and a longer lifespan than the normal battery.

Preparation of flexible energy storage device based on reduced graphene oxide (rGO)/conductive polymer composite (환원된 그래핀 옥사이드/전도성 고분자 복합체를 이용한 플렉시블 에너지 저장 매체의 개발)

  • Jeong, Hyeon Taek;Cho, Jae Bong;Kim, Jang Hun;Kim, Yong Ryeol
    • Journal of the Korean Applied Science and Technology
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    • 제34권2호
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    • pp.280-288
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    • 2017
  • Nanocarbon base materials such as, graphene and graphene hybrid with high electrochemical performances have great deal of attention to investigate flexible, stretchable display and wearable electronics in order to develop portable and high efficient energy storage devices. Battery, fuel cell and supercapacitor are able to achieve those properties for flexible, stretchable and wearable electronics, especially the supercapacitor is a promise energy storage device due to their remarkable properties including high power and energy density, environment friendly, fast charge-discharge and high stability. In this study, we have fabricated flexible supercapacitor composed of graphene/conductive polymer composite which could improve its electrochemical performance. As a result, specific capacitance value of the flexible supercapacitor (unbent) was $198.5F\;g^{-1}$ which decreased to $128.3F\;g^{-1}$ (65% retention) after $500^{th}$ bending cycle.

The study of electrode for energy storaging at supercapacitor system using nano carbon fiber material (나노 탄소재료를 이용한 에너지 저장형 슈퍼커패시터용 전극 제조)

  • Hwang, Sung-Ik;Choi, Won-Kyung;Momma, Toshiyukl;Osaka, Tetsuya;Park, Soo-Gil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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    • pp.683-686
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    • 2004
  • In recent years, the supercapacitor and hybrid capacitor have related with substitutional energy source focused of many scientists because of their usage in power sources for electric vehicles, computers and other electric devices. The storage energy of electrical charge is based on electrostatic interactions in the electric double layer at the electrode/electrolyte interface, resulting in high rate capability and long cycle performance compared with batteries based on Faradaic electrode reactions. So we have been considered to carbon nanofibers as the ideal material for supercapacitors due to their high utilization of specific surface area, good conductivity, chemical stability and other advantages. In this work, we aimed to find out that the capacitance have increased because of electrochemical capacitance to provide by carbon nanofibers. Also carbon nanofibers based on chemical method and water treatment have been resulted larger capacitances and also exhibit better electrochemical behaviors about 15% than before of nontreated state. And also optical observations with treated and nontrteated carbon nanofibers discussed by the TEM, SEM, EDX, BET works and specific surface area analyzer. Their results also focused on the surface area of electrode and electrical capacitance was also improved by the effect of surface treatments.

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A Novel Hybrid Supercapacitor Using a Graphite Cathode and a Niobium(V) Oxide Anode

  • Park, Gum-Jae;Kalpana, D.;Thapa, Arjun Kumar;Nakamura, Hiroyoshi;Lee, Yun-Sung;Yoshio, Masaki
    • Bulletin of the Korean Chemical Society
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    • 제30권4호
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    • pp.817-820
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    • 2009
  • To meet the high current load requirement from the high energy density realized by metal oxide and high power density graphite, we propose a novel hybrid supercapacitor consisting of Nb2O5 and KS6 graphite in 1.0 M LiPF6-EC:DEC (1:2). This new system exhibits a sloping voltage profile from 2.7 to 3.5 V during charging and presents a high operating voltage plateau between 1.5 and 3.5 V during discharging. The cell was tested at a current density of 100 mA/g with a cut-off voltage between 3.0 and 1.0 V. This novel energy storage system delivers the highest initial discharge capacity of 55 mAh/g and exhibits a good cycle performance.