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Special Issue "Advances in Electrochemical Energy Storage Devices"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Electrochemistry".

Deadline for manuscript submissions: 30 September 2019

Special Issue Editor

Guest Editor
Assoc. Prof. Dr. Amor M. Abdelkader

Associate Professor of Advanced Materials, Head of Research & Professional Practice, Department of Design and Engineering, Faculty of Science and Technology, Bournemouth University, C226, Christchurch House, Talbot Campus, Fern Barrow, Poole, Dorset, BH12 5BB, UK
Visitor Academic, Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK
Website 1 | Website 2 | E-Mail
Interests: rechargeable batteries; supercapacitors; nanomaterials; energy materials; electrochemical CO2 sequestration

Special Issue Information

Dear Colleagues,

There is a growing interest in electrochemical energy storage devices to empower portable electronics, electric vehicles and to fulfil the need for the large-scale storage of stationary applications. Despite significant research efforts in recent years, there remain key challenges to be overcome in the near future. These include improvements to storage energy density and power density, conversion efficiency, cost, cycle life, battery weight and volume, and battery safety.

Chemical and conceptual developments are progressing, with electrolytes, packaging materials, and electrode materials and structures also advancing. There has been a simultaneous focus on the development of flexible energy storage devices, motivated by the rise of wearable electronics. Furthermore, theoretical and experimental studies are seeking to understand the fundamentals of physicochemical processes, including electronic and ionic transport in electrodes, electrolyte phases and stability, electrochemical reactions, material phase changes, and mechanical and thermal stresses.

This Special Issue focuses on recent advancements in electrochemical energy storage technology, encompassing supercapacitors, primary batteries and rechargeable batteries. Contributions of both original articles and comprehensive reviews, will cover the latest developments in device architecture, electrode design and materials, thermal and mechanical stress management, large-scale devices, and energy device manufacturing processes.

Assoc. Prof. Dr. Amor M. Abdelkader
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Primary batteries
  • Rechargeable batteries
  • Supercapacitors
  • Hybrid electrochemical energy storage

Published Papers (4 papers)

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Research

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Open AccessArticle
Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes
Molecules 2019, 24(10), 1893; https://doi.org/10.3390/molecules24101893
Received: 17 April 2019 / Revised: 7 May 2019 / Accepted: 13 May 2019 / Published: 16 May 2019
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Abstract
Solid-solution Li-ion cathode materials transform through a single-phase reaction thus leading to a long-term structural stability and improved cyclability. In this work, a two- to single-phase Li+-extraction/insertion mechanism is studied through tuning the stoichiometry of transition-metal Fe/V cations to trigger a [...] Read more.
Solid-solution Li-ion cathode materials transform through a single-phase reaction thus leading to a long-term structural stability and improved cyclability. In this work, a two- to single-phase Li+-extraction/insertion mechanism is studied through tuning the stoichiometry of transition-metal Fe/V cations to trigger a transition in the chemical reactivity path. Tavorite triclinic-structured LiFe1−xVxPO4F (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) solid-solution powders were prepared by a facile one-step solid-state method from hydrothermal-synthesized and commercial raw materials. The broad shape of cyclic voltammetry (CV) peaks, sloping charge/discharge profiles and sloping open-circuit voltage (OCV) profiles were observed in LiFe1−xVxPO4F solid-solution cathodes while 0 < x < 1. These confirm strongly a single-phase behavior which is different from the two-phase behavior in the end-members (x = 0 or 1). The electronegativity of M (M = Fe1−xVx) for the redox potential of Fe2+/3+ couple or the M–O4F2 bond length for the V3+/4+ couple plays respectively a dominant role in LiFe1−xVxPO4F solid-solution cathodes. Full article
(This article belongs to the Special Issue Advances in Electrochemical Energy Storage Devices)
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Open AccessArticle
Well-Wrapped Li-Rich Layered Cathodes by Reduced Graphene Oxide towards High-Performance Li-Ion Batteries
Molecules 2019, 24(9), 1680; https://doi.org/10.3390/molecules24091680
Received: 4 April 2019 / Revised: 23 April 2019 / Accepted: 26 April 2019 / Published: 30 April 2019
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Abstract
Layered lithium-rich manganese oxide (LLO) cathode materials have attracted much attention for the development of high-performance lithium-ion batteries. However, they have suffered seriously from disadvantages, such as large irreversible capacity loss during the first cycle, discharge capacity decaying, and poor rate performance. Here, [...] Read more.
Layered lithium-rich manganese oxide (LLO) cathode materials have attracted much attention for the development of high-performance lithium-ion batteries. However, they have suffered seriously from disadvantages, such as large irreversible capacity loss during the first cycle, discharge capacity decaying, and poor rate performance. Here, a novel method was developed to coat the surface of 0.4Li2MnO3∙0.6LiNi1/3Co1/3Mn1/3O2 cathode material with reduced graphene-oxide (rGO) in order to address these drawbacks, where a surfactant was used to facilitate the well-wrapping of rGO. As a result, the modified LLO ([email protected]) cathode exhibits superior electrochemical performance including cycling stability and rate capability compared to the pristine LLO cathode. In particular, the [email protected] with a 0.5% rGO content can deliver a high discharge capacity of 166.3 mAh g−1 at a 5C rate. The novel strategy developed here can provide a vital approach to inhibit the undesired side reactions and structural deterioration of Li-rich cathode materials, and should be greatly useful for other cathode materials to improve their electrochemical performance. Full article
(This article belongs to the Special Issue Advances in Electrochemical Energy Storage Devices)
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Open AccessArticle
Synthesis and Luminescence Properties of a Novel Green-Yellow-Emitting Phosphor BiOCl:Pr3+ for Blue-Light-Based w-LEDs
Molecules 2019, 24(7), 1296; https://doi.org/10.3390/molecules24071296
Received: 6 March 2019 / Revised: 28 March 2019 / Accepted: 1 April 2019 / Published: 3 April 2019
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Abstract
The development of white-light-emitting diodes (w-LEDs) makes it meaningful to develop novel high-performance phosphors excited by blue light. Herein, BiOCl:Pr3+ green-yellow phosphors were prepared via a high-temperature solid-state reaction method. The crystal structure, luminescent properties, lifetime, thermal quenching behavior, and quantum yield [...] Read more.
The development of white-light-emitting diodes (w-LEDs) makes it meaningful to develop novel high-performance phosphors excited by blue light. Herein, BiOCl:Pr3+ green-yellow phosphors were prepared via a high-temperature solid-state reaction method. The crystal structure, luminescent properties, lifetime, thermal quenching behavior, and quantum yield were studied in detail. The BiOCl:Pr3+ phosphors presented several emission peaks located in green and red regions, under excitation at 453 nm. The CIE coordinates could be tuned along with the changed doping concentration with fair luminescence efficiency. The results also indicated that the optimized doping concentration of Pr3+ ions was at x = 0.0075 because of the concentration quenching behavior resulting from an intense exchange effect. When the temperature reached 150 °C, the intensity of the emission peak at 495 nm could remain at 78% of that at room temperature. The activation energy of 0.20 eV also confirmed that the BiOCl:Pr3+ phosphor exhibited good thermal stability. All these results indicate that the prepared products have potential to be used as a high-performance green-yellow-light-emitting phosphor for blue-light-based w-LEDs. Full article
(This article belongs to the Special Issue Advances in Electrochemical Energy Storage Devices)
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Other

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Open AccessConcept Paper
How to Measure and Calculate Equivalent Series Resistance of Electric Double-Layer Capacitors
Molecules 2019, 24(8), 1452; https://doi.org/10.3390/molecules24081452
Received: 21 February 2019 / Revised: 24 March 2019 / Accepted: 28 March 2019 / Published: 12 April 2019
PDF Full-text (1763 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Electric double-layer capacitors (EDLCs) are energy storage devices that have attracted attention from the scientific community due to their high specific power storage capabilities. The standard method for determining the maximum power (Pmax) of these devices uses the relation P [...] Read more.
Electric double-layer capacitors (EDLCs) are energy storage devices that have attracted attention from the scientific community due to their high specific power storage capabilities. The standard method for determining the maximum power (Pmax) of these devices uses the relation Pmax = U2/4RESR, where U stands for the cell voltage and RESR for the equivalent series resistance. Despite the relevance of RESR, one can observe a lack of consensus in the literature regarding the determination of this parameter from the galvanostatic charge-discharge findings. In addition, a literature survey revealed that roughly half of the scientific papers have calculated the RESR values using the electrochemical impedance spectroscopy (EIS) technique, while the other half used the galvanostatic charge discharge (GCD) method. RESR values extracted from EIS at high frequencies (>10 kHz) do not depend on the particular equivalent circuit model. However, the conventional GCD method better resembles the real situation of the device operation, and thus its use is of paramount importance for practical purposes. In the latter case, the voltage drop (ΔU) verified at the charge-discharge transition for a given applied current (I) is used in conjunction with Ohm’s law to obtain the RESR (e.g., RESR = ΔUI). However, several papers have caused a great confusion in the literature considering only applied current (I). In order to shed light on this important subject, we report in this work a rational analysis regarding the GCD method in order to prove that to obtain reliable RESR values the voltage drop must be normalized by a factor of two (e.g., RESR = ΔU/2I). Full article
(This article belongs to the Special Issue Advances in Electrochemical Energy Storage Devices)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Flow through electrode boundary modification for enhanced redox flow battery cell performance
Authors: Nicholas Gurieff, Declan Keogh, Victoria Timchenko, Chris Menictas
Abstract:
Redox flow batteries (RFBs), as a safe and cost effective means of storing energy at grid-scale, will play an important role in the decarbonisation of global electricity networks. Their full potential, however, will only be realised with improvements to their power density. Several approaches have been explored, and recently cell geometry modification has shown promise in efforts to address mass transport limitations which effect electrochemical and overall system performance. Flow-by electrode configurations have demonstrated significant performance improvements in laboratory testing, however flow-through designs with conductive felt remain widely used. This research shows improvements through the modification of electrode boundaries within simulated vanadium redox flow battery (VRFB) cells with solid and porous conductive materials.

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