• Title/Summary/Keyword: Ni-MH batteries

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A Study on the Development of Zr-Ti-Mn-V-Ni Hydrogen Storage Alloy for Ni-MH Rechargeable Battery (Ni-MH 2차 전지용 고용량, 고성능 Zr-Ti-Mn-V-Ni계 수소저장합금의 개발에 관한 연구)

  • Kim, Dong-Myung;Jung, Jae-Han;Lee, Sang-Min;Lee, Jai-Young
    • Transactions of the Korean hydrogen and new energy society
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    • v.7 no.2
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    • pp.137-145
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    • 1996
  • The Zr-based $AB_2$ type Laves phase hydrogen storage alloys have some promising properties, long cycle life, high discharge capacity, as electrode materials in reversible metal hydride batteries. However, when these alloys are used as negative electrode for battery, there is a problem that their rate capabilities are worse than those of commercialized $AB_5$ type hydrogen storage alloys. In this work, we tried to develop the Zr-based $AB_2$ type Laves phase hydrogen storage alloys which have high capacity and, especially, high rate capability.

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A Study on SOC Algorithm and Design of Battery ECU for Hybrid Electric Vehicle (하이브리드 전기자동차용 배터리 ECU 설계 및 잔존용량 알고리즘에 관한 연구)

  • 남종하;최진홍;김승종;황호석;김재웅
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.4
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    • pp.319-325
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    • 2004
  • The major factors that make ZEV affordable are the range and cost. The development of advanced batteries such as Ni-MH battery can solve the problem partly; on the hand the battery management system is an efficient way. Ni-MH battery and battery ECU is a key component influencing ZEV performance, such as range, acceleration and hill-climbing capability. Because most problems related to battery such as short circuit, over-discharge and overcharge occur easily during operation, it is necessary to develop a dedicated battery ECU for HEV. This paper proposes a new SOC algorithm for the HEV based on the terminal voltage and current integration. And battery ECU was designed and analyzed. Also, the validity is confirmed through experiment.

A Study on the Electrode Charcteristics of the Fluornated AB$_2$ Type Hydrogen Storage Alloys (불화 처리된 AB$_2$계 수소저장합금의 전극특성에 관한 연구)

  • 박호영;이명호;조원일;조병래;이성래;주재백;윤경석
    • Journal of the Korean institute of surface engineering
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    • v.30 no.4
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    • pp.262-271
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    • 1997
  • Nickel-matal hydride(Ni-MH) batteries are receiving attention as non-pollunting. high performance rehargeable energy stoage system. The performance of Ni-Mh is significantly influenced by the hydrogen storage alloy materiels used as an anode material. Recently, having discharge capacities higher than the $AB_5$-type hydrogen storage alloys, the Zr-based $AB_2$-Type hydrogen storage alloys has remaining problems regarding cycle life and self-dischareg. These problems need to be solved by improvements in the alloy design and/or surface treatment. This work investiggates the effects the effects of surface property by fluorination on $Zr_{0.7}Ti_{0.3}V_{0.4}Mn_{0.4}Ni{1.2}$ composittion $AB_2$-Type hydrogen storage alloys. EPMA, SEM and AES techniques were used for surface analysis, and the crystal structure was characterized by constant current cycling test and potential sweep methods. Fluorination was found to be effective when La-was incorporated into the alloy, and has unique morphology, higher reactivity, and at the same time formed a protective film. Through, fluorination, the cycle life of an electrode was found to increase significantly, charge/discharge characteristics of the electrode the potential difference between the charge/discharge plateau, i.e polarization(overpotential)were improved.

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The development of mobile fuel cell (모바일용 연료전지 개발)

  • Lee K.I.;Park M.S.;Cho Y.H.;Cho Y.H.;Sung Y.E.;Chu C.N.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.549-550
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    • 2006
  • Mobile fuel cell is highlighted in these days because mobile fuel cell can contain more energy than existing batteries. Nowadays mobile devices like cellular phone, PMP(portable multi-media player), notebook, and etc. need more energy, But existing batteries like Li-ion or Ni-MH batteries are not going to satisfy such demands. In this paper, mobile fuel cell is developed. Its size is 50*70*8mm and it is made of aluminium plates. The fuel cell type is PEM and the fuel is pure hydrogen and oxygen.

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The Impeditive Properties and Charge/Discharge of Positive Active Material $LiMnO_2$ (정극 활물질 LiMnO2 충.방전과 임피던스 특성)

  • Wi, Seong-Dong;Kim, Jong-Ok;Gu, Hal-Bon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.05c
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    • pp.299-305
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    • 2003
  • The battery industries have been developed to the implementation of lithium ion secondary cell from the cell of Ni/Cd and Ni/MH in the past to be asked of an age of high technology from low technology. Also in resent the polymeric cell to get a good high function with an age of new advanced information system is changed from the 21 century to the secondary batteries society. The properties of lithium secondary batteries have the high energy density, the long cycle time, the low self discharge area and the high active voltage. The wanted properties of secondary batteries for the motion of an apparatuses of industries of an high skill age have a small type trend of the energy density and it is become with a strong asking of the industrial society market about the storable medium of the convenience and new power energy. The electrochemical properties is researched for the cell to be synthesised and crystallized the positive active material LiMnO2 of the secondary cell at 9250C to get a new improved data of the electric discharge for that the capacitance of the LiMnO2 thin film that is improving and researching with the properties and a merit and demerit in the this kind of asking.

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Electrode Fabrication and Electrochemical Characterization of a Sealed Ni-MH Battery for Industrial Use (산업용 밀폐형 니켈수소전지의 전극 제조 및 전기화학적 특성)

  • An, Yang-Im;Kim, Sae-Hwan;Jo, Jin-Hun;Kim, Ho-Sung
    • Journal of the Korean Electrochemical Society
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    • v.11 no.4
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    • pp.289-296
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    • 2008
  • Electrochemical studies were performed by a half-cell test for the nickel hydroxide (cathode) and hydrogen storage alloy(anode) electrodes for the sealed Ni-MH batteries applicable to industrial use. The electrodes were fabricated and checked a charge efficiency and an internal pressure of the battery during charge-discharge cycling. In order to reduce the internal pressure of the sealed Ni-MH battery, cyclic voltammetry (CV) were performed on the electrodes of nickel hydroxide(cathode) and hydrogen storage alloy(anode), respectively. The results of the test showed clearly the oxidation/reduction and oxygen evolution reaction in a nickel hydroxide electrode and the hydrogenation behavior of a hydrogen storage electrode. The sealed Ni-MH battery of 130Ah was fabricated by using nickel hydroxide of a high over-voltage for an oxygen gas evolution and hydrogen storage alloy of a good performance for activation The battery showed a good characteristics such as a high charge efficiency of 98% at 1 C charge current, a low level internal pressure of 4 atm on a continuous over-charging and a large preservation capacity of 95% at 400 cycle.

Study for Effective Cooling of Ni-MH Battery Module Using Forced Air Flow (공기 유동에 따른 Ni-MH 배터리 모듈의 효과적인 냉각에 관한 연구)

  • Ahn, Chi-Yeong;Kim, Tae-Sin;Kim, Jun-Bom
    • Journal of the Korean Electrochemical Society
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    • v.14 no.4
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    • pp.253-260
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    • 2011
  • In this study, computational simulation was performed for thermal management of modules consisting of 10 batteries. Simplified structure and equivalent thermal resistance network was applied to maintain the thermal properties. Verification test of the mesh were in progress to ensure the reliability of 2.6 mm in the narrow gap between the battery, resulting in at least three divided mesh between the shape of the grid was required. Type of air from rear of the module, type of air from top of the module and type of air from bottom of the module were applied and effective cooling methods are discussed based on the location of fan and air intake of the modules. Maximum temperature and temperature differences of modules that directly affect the performance of the module were compared, and also behavior of the fluid was confirmed by comparing the air flow. The best maximum temperature is shown type of air from bottom of the module to $40.27^{\circ}C$ and type of air from top of the module shows smallest temperature difference $0.73^{\circ}C$.

A Study on the Separation of Cerium from Rare Earth Precipitates Recovered from Waste NiMH Battery (폐니켈수소전지에서 회수된 희토류복합 침전분말로부터 세륨 회수에 대한 연구)

  • Kim, Boram;Ahn, Nak-Kyoon;Lee, Sang-Woo;Kim, Dae-Weon
    • Resources Recycling
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    • v.28 no.6
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    • pp.18-25
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    • 2019
  • In order to recover the cerium contained in the spent nickel metal hydride batteries (NiMH battery), the recovered rare earth complex precipitates from NIMH were converted into rare earth hydroxides through ion exchange reaction to react with NaOH aqueous solution at a reaction temperature of 70 ℃, for 4 hours. Rare earth hydroxides were oxidized by injecting air at 80 ℃ for 4 hours to oxidize Ce3+ to Ce4+. The oxidation rate of cerium was confirmed to be about 25 % through XPS, and the oxidized powder was separated from the rest of the rare earth using the difference in solubility in dilute sulfuric acid. The finally recovered powder has a crystal phase of cerium hydroxide (Ce(OH)4). The cerium purity of the final product was about 94.6 %, and the recovery rate was 97.3 %.

Electrochemical Study of a Single Particle of Active Material for Secondary Battery using the Microelectrode (마이크로 전극에 의한 2차 전지용 활물질 단일 입자의 전기화학적 평가)

  • Kim Ho-Sung;Lee Choong-Gon
    • Journal of the Korean Electrochemical Society
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    • v.9 no.2
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    • pp.95-99
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    • 2006
  • Electrochemical properties were studied for a single particle of active material of hydrogen storage alloy $(MmNi_{3.55}Co_{0.75}Mn_{0.4}Al_{0.3})$ and nickel hydroxides $(NiOH)_2$ for the secondary Nickel Metal Hydride (Ni-MH) batteries using the microelectrode, which was manipulated to make electrical contact with an active material particle for cyclic voltammograms (CV) and potential-step experiments. As a result of CV test, it was found that three kinds of hydrogen oxidation peaks at -0.9, -0.75 and -0.65 V and hydrogen evolution peak at -0.98 V for hydrogen storage alloy were separately observed and two kinds of peaks of proton oxidation/reduction at 0.45 and 0.32 V and oxygen evolution reaction (OER) at 0.6 V for nickel hydroxides were also more clearly observed. Furthermore hydrogen diffusion coefficient within a single particle was also found to vary the order between $10^{-9}\;and\;10^{-10}cm^2/s$ over the course of hydrogenation and dehydrogenation process for potential-step experiments.

The Effects of Partial Substitution of Mo and Heat Treatment on the Electrode Characteristics of ZrV0.1Mn0.7Ni1.2 Hydrogen Storage alloy (Ni-MH 2차 전지용 ZrV0.1Mn0.7Ni1.2 수소저장합금의 전극특성에 미치는 Mo의 부분치환과 열처리의 영향)

  • Han, Dongsoo;Oh, Myunghark;Jeong, Chigyu;Chung, Wonsub;Kim, Ingon
    • Transactions of the Korean hydrogen and new energy society
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    • v.9 no.1
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    • pp.16-24
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    • 1998
  • Recently Zr-based $AB_2$ type hydrogen absorbing alloy has received much attention as a negative electrode material for the Ni-MH batteries because of its high capacity. In this study $ZrV_{0.1}Mn_{0.7}Ni_{1.2}$ alloy was chosen and the effects of heat treatment and a partial substitution of the Mo in Mn site on the various electrode properties were investigated. The alloys was prepared by arc melting (as-cast sample). Some of them were heat treated at $1,100^{\circ}C$ for 4 hours. After this they were differentiated by the different cooling rates of slow cooling and quenching. Various electrode characteristics such as activation process, high rate dischargeability and self discharge characteristic were investigated with the three types of electrodes. It was found that heat treated alloys resulted in an increase in plateau flatness of P-C isotherms however both discharge capacity and high rate capability were decreased. And the partial substitution of Mo for Mn in $ZrV_{0.1}Mn_{0.7}Ni_{1.2}$ alloy improved the self-discharge characteristic without the loss of discharge capacity (300mAh/g).

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