Author
L. Vijayaraghavan
Bio: L. Vijayaraghavan is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Hydride & Alloy. The author has an hindex of 4, co-authored 4 publications receiving 98 citations.
Topics: Hydride, Alloy, Electrochemistry, Hydrogen storage, Electrode
Papers
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TL;DR: In this article, a novel AB5-type, non-stoichiometric, lanthanum-rich MmNi3.03Si0.85Co0.60Mn0.31Al0.08 (Mm: Misch metal) hydrogen storage metal hydride alloy electrodes are prepared.
46 citations
TL;DR: In this article, the performance of copper nano-current collectors on the surface of MmNi 3.25 Al 0.35 Mn 0.25 Co 0.66 (Mm: misch metal) metal hydride alloy was investigated.
39 citations
TL;DR: The cyclic voltammetric behavior of MmNi 3.03 Si 0.85 Co 0.60 Mn 0.31 Al 0.08 -based metal hydride electrode was studied in alkaline electrolytes at various temperatures (303, 308, 318 and 328 K).
12 citations
TL;DR: In this article, the performance of assembled Ni-MH batteries (1.2 V, 0.5 Ah) when subjected to different charging rates is described and changes in battery voltage during charging were monitored with a particular emphasis on the quest for fast recharge characteristics.
7 citations
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TL;DR: Recent progress in functional materials applied in the currently prevailing rechargeable lithium-ion, nickel-metal hydride, lead acid, vanadium redox flow, and sodium-sulfur batteries is reviewed.
Abstract: There is an ever-growing demand for rechargeable batteries with reversible and efficient electrochemical energy storage and conversion. Rechargeable batteries cover applications in many fields, which include portable electronic consumer devices, electric vehicles, and large-scale electricity storage in smart or intelligent grids. The performance of rechargeable batteries depends essentially on the thermodynamics and kinetics of the electrochemical reactions involved in the components (i.e., the anode, cathode, electrolyte, and separator) of the cells. During the past decade, extensive efforts have been dedicated to developing advanced batteries with large capacity, high energy and power density, high safety, long cycle life, fast response, and low cost. Here, recent progress in functional materials applied in the currently prevailing rechargeable lithium-ion, nickel-metal hydride, lead acid, vanadium redox flow, and sodium-sulfur batteries is reviewed. The focus is on research activities toward the ionic, atomic, or molecular diffusion and transport; electron transfer; surface/interface structure optimization; the regulation of the electrochemical reactions; and the key materials and devices for rechargeable batteries.
1,384 citations
TL;DR: In this article, a novel TiZrHfNiCuCo high entropy alloy (HEA), which contains two different body-centered-cubic phases in bulk form, was utilized with the aim of developing nano-composite-structured HEA thin films via a reactive direct current magnetron sputtering.
81 citations
TL;DR: In this paper, the phase structure, electrochemical properties and hydrogen storage mechanism as negative electrodes for nickel/metal hydride (Ni/MH) batteries have been investigated systematically, and the results of X-ray diffraction (XRD) analysis show both calcined powder and the charged/discharged samples after 10 cycles have orthorhombic structures.
73 citations
TL;DR: In this paper, the saturation magnetization of activated metal hydride material and electrode performance was investigated, and the specific power measured at both low temperature (−30°C) and operating temperature (35°C), respectively, was compared with magnetization measurements.
71 citations
TL;DR: In this article, the authors provide a summary of effective methods to extend Ni/MH cell cycle life through negative electrode formula optimizations and binder selection, positive electrode additives and coatings, electrolyte optimization, cell design, and others.
Abstract: The consistency in capacity degradation in a multi-cell pack (>100 cells) is critical for ensuring long service life for propulsion applications. As the first step of optimizing a battery system design, academic publications regarding the capacity degradation mechanisms and possible solutions for cycled nickel/metal hydride (Ni/MH) rechargeable batteries under various usage conditions are reviewed. The commonly used analytic methods for determining the failure mode are also presented here. The most common failure mode of a Ni/MH battery is an increase in the cell impedance due to electrolyte dry-out that occurs from venting and active electrode material degradation/disintegration. This work provides a summary of effective methods to extend Ni/MH cell cycle life through negative electrode formula optimizations and binder selection, positive electrode additives and coatings, electrolyte optimization, cell design, and others. Methods of reviving and recycling used/spent batteries are also reviewed.
53 citations