Synthesis and Crystal Chemistry of Potential Electrode Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 7138

Special Issue Editor


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Guest Editor
Institute of Condensed Matter Chemistry of Bordeaux (ICMCB-CNRS), 33608 Pessac, France
Interests: crystallography; electrochemistry; metal-ion batteries; mineralogy

Special Issue Information

Dear Colleagues,

Today, materials for electrochemical storage play a significant role for a diverse range of applications in different areas, and the development of such materials has become an important part of many research projects. Over the last few decades, intensive efforts of researchers have been focused mainly on the electrochemical performance of well-known materials and their optimization by tuning composition and structure. Both cation and anion engineering may act as a main strategy to increase the energy density of the batteries. However, less attention has been given to understanding the fundamental processes responsible for charge and discharge transport in electrode materials. In order to introduce novel classes of potential battery materials, the crystal chemical nature of electrochemical processes must be explored. Here, a crystal structure is considered as a key characteristic that directly influences the properties, such as operating voltages and capacity of electrode materials.

Thus, the present Crystals Special Issue focuses on the crystal chemistry of crystalline compounds with the potential to become electrode or solid electrolyte materials in various energy storage systems. The aim of the present Special Issue is to explore new potential electrode materials and to improve the understanding of phase transformations between the charged and discharged states of the electrodes. We provide a welcome venue for all contributions on various related subjects. This includes but is not limited to:

  • Novel cathode, anode, and ionic conductor materials for any types of rechargeable batteries;
  • Synthesis and design of potential electrode structures;
  • Crystal chemistry of electrode materials;
  • Investigation of ion diffusion properties of crystalline materials.

Dr. Vadim M. Kovrugin
Guest Editor

Manuscript Submission Information

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Keywords

  • Crystal structure
  • Electrochemistry
  • Cathode
  • Anode
  • Na-ion battery
  • Li-ion battery
  • Ionic conductivity

Published Papers (2 papers)

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Research

11 pages, 3319 KiB  
Article
Exploring the Role of Crystal Water in Potassium Manganese Hexacyanoferrate as a Cathode Material for Potassium-Ion Batteries
by Polina A. Morozova, Ivan A. Trussov, Dmitry P. Rupasov, Victoria A. Nikitina, Artem M. Abakumov and Stanislav S. Fedotov
Crystals 2021, 11(8), 895; https://doi.org/10.3390/cryst11080895 - 30 Jul 2021
Cited by 16 | Viewed by 4155
Abstract
The Prussian Blue analogue K2−δMn[Fe(CN)6]1−ɣ∙nH2O is regarded as a key candidate for potassium-ion battery positive electrode materials due to its high specific capacity and redox potential, easy scalability, and low cost. However, various intrinsic defects, [...] Read more.
The Prussian Blue analogue K2−δMn[Fe(CN)6]1−ɣ∙nH2O is regarded as a key candidate for potassium-ion battery positive electrode materials due to its high specific capacity and redox potential, easy scalability, and low cost. However, various intrinsic defects, such as water in the crystal lattice, can drastically affect electrochemical performance. In this work, we varied the water content in K2−δMn[Fe(CN)6]1−ɣ∙nH2O by using a vacuum/air drying procedure and investigated its effect on the crystal structure, chemical composition and electrochemical properties. The crystal structure of K2−δMn[Fe(CN)6]1−ɣ∙nH2O was, for the first time, Rietveld-refined, based on neutron powder diffraction data at 10 and 300 K, suggesting a new structural model with the Pc space group in accordance with Mössbauer spectroscopy. The chemical composition was characterized by thermogravimetric analysis combined with mass spectroscopy, scanning transmission electron microscopy microanalysis and infrared spectroscopy. Nanosized cathode materials delivered electrochemical specific capacities of 130–134 mAh g1 at 30 mA g1 (C/5) in the 2.5–4.5 V (vs. K+/K) potential range. Diffusion coefficients determined by potentiostatic intermittent titration in a three-electrode cell reached 10−13 cm2 s−1 after full potassium extraction. It was shown that drying triggers no significant changes in crystal structure, iron oxidation state or electrochemical performance, though the water level clearly decreased from the pristine to air- and vacuum-dried samples. Full article
(This article belongs to the Special Issue Synthesis and Crystal Chemistry of Potential Electrode Materials)
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17 pages, 7383 KiB  
Article
Effect of Synthesis Method of Nickel–Samarium-Doped Ceria Anode on Distribution of Triple-Phase Boundary and Electrochemical Performance
by Muhammed Ali Shaikh Abdul, Ahmad Zubair Yahaya, Mustafa Anwar, Mun Teng Soo, Andanastuti Muchtar and Vadim M. Kovrugin
Crystals 2021, 11(5), 513; https://doi.org/10.3390/cryst11050513 - 6 May 2021
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Abstract
Two-dimensional (2D) electron back scattered diffraction (EBSD) is a powerful tool for microstructural characterization of crystalline materials. EBSD enables visualization and quantification of the effect of synthesis methods on the microstructure of individual grains, thus correlating the microstructure to mechanical and electrical efficiency. [...] Read more.
Two-dimensional (2D) electron back scattered diffraction (EBSD) is a powerful tool for microstructural characterization of crystalline materials. EBSD enables visualization and quantification of the effect of synthesis methods on the microstructure of individual grains, thus correlating the microstructure to mechanical and electrical efficiency. Therefore, this work was designed to investigate the microstructural changes that take place in the Ni-SDC cermet anode under different synthesis methods, such as the glycine–nitrate process (GNP) and ball-milling. EBSD results revealed that different grain size and distribution of Ni and SDC phases considerably influenced the performance of the Ni–SDC cermet anodes. The performance of the Ni–SDC cermet anode from GNP was considerably higher than that of Ni-SDC from ball-milling, which is attributed to the triple-phase boundary (TPB) density and phase connectivity. Due to the poor connectivity between the Ni and SDC phases and the development of large Ni and SDC clusters, the Ni-SDC cermet anode formed by ball milling had a lower mechanical and electrical conductivity. Moreover, the Ni–SDC cermet anode sample obtained via GNP possessed sufficient porosity and did not require a pore former. The length and distribution of the active TPB associated with phase connectivity are crucial factors in optimizing the performance of Ni-SDC cermet anode materials. The single cell based on the Ni–SDC composite anode prepared through GNP exhibited a maximum power density of 227 mW/cm2 and 121 mW/cm2 at 800 °C in H2 and CH4, respectively. Full article
(This article belongs to the Special Issue Synthesis and Crystal Chemistry of Potential Electrode Materials)
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