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Special Issue "Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism"

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: closed (10 June 2023) | Viewed by 3551

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Dr. Qiang Chen

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School of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Interests: non-metal-ion energy storage devices; aqueous Zn-ion batteries; flexible energy storage devices

Special Issue Information

Dear Colleagues,

As an important component for storing and exchanging electrons, electrodes are widely used in electrochemical energy storage, catalysis, welding, medicine, and other fields, and play a decisive role in device performance. Therefore, it is urgent to develop advanced processing methods to fabricate high-performance electrodes and reveal their storage mechanisms.

This Special Issue aims to provide a forum to discuss the processing methods and storage mechanisms of high-performance electrodes. The scope of the Special Issue includes basic research on electrodes for high-performance electrochemical energy storage and conversion devices (metal-ion batteries, non-metal-ion batteries, metal-air batteries, supercapacitors, photocatalytic, electrocatalytic, etc.), as well as applied research on advanced processing methods for electrodes. The Issue’s scope also includes studies on the structural stability and charge-storage mechanisms of electrode materials.

Dr. Qiang Chen
Guest Editor

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Keywords

high-performance electrode material
electrode processing methods
electrode storage mechanism
long-life electrode
metal electrode protection
electrode surface and interface
flexible electrode
catalytic electrode

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Editorial

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Open AccessEditorial

Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism

Qiang Chen

Materials 2022, 15(24), 8987; https://doi.org/10.3390/ma15248987 - 16 Dec 2022

Viewed by 727

Abstract

The scope of the Special Issue entitled “Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism” includes the research on electrodes of high-performance electrochemical energy storage and conversion devices (metal ion batteries, non-metallic ion batteries, metal–air batteries, supercapacitors, photocatalysis, electrocatalysis, etc [...] Full article

(This article belongs to the Special Issue Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism)

Research

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Open AccessArticle

Investigations of Structural, Magnetic, and Electrochemical Properties of NiFe₂O₄ Nanoparticles as Electrode Materials for Supercapacitor Applications

and

Materials 2023, 16(12), 4328; https://doi.org/10.3390/ma16124328 - 12 Jun 2023

Cited by 1 | Viewed by 500

Abstract

Magnetic nanoparticles of NiFe₂O₄ were successfully prepared by utilizing the sol–gel techniques. The prepared samples were investigated through various techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), dielectric spectroscopy, DC magnetization and electrochemical measurements. XRD data analysed using Rietveld refinement procedure inferred that NiFe₂O₄ nanoparticles displayed a single-phase nature with face-centred cubic crystallinity with space group Fd-3m. Average crystallite size estimated using the XRD patterns was observed to be ~10 nm. The ring pattern observed in the selected area electron diffraction pattern (SAED) also confirmed the single-phase formation in NiFe₂O₄ nanoparticles. TEM micrographs confirmed the uniformly distributed nanoparticles with spherical shape and an average particle size of 9.7 nm. Raman spectroscopy showed characteristic bands corresponding to NiFe₂O₄ with a shift of the A_1g mode, which may be due to possible development of oxygen vacancies. Dielectric constant, measured at different temperatures, increased with temperature and decreased with increase in frequency at all temperatures. The Havrilliak–Negami model used to study the dielectric spectroscopy indicated that a NiFe₂O₄ nanoparticles display non-Debye type relaxation. Jonscher’s power law was utilized for the calculation of the exponent and DC conductivity. The exponent values clearly demonstrated the non-ohmic behaviour of NiFe₂O₄ nanoparticles. The dielectric constant of the nanoparticles was found to be >300, showing a normal dispersive behaviour. AC conductivity showed an increase with the rise in temperature with the highest value of 3.4 × 10⁻⁹ S/cm at 323 K. The M-H curves revealed the ferromagnetic behaviour of a NiFe₂O₄ nanoparticle. The ZFC and FC studies suggested a blocking temperature of ~64 K. The saturation of magnetization determined using the law of approach to saturation was ~61.4 emu/g at 10 K, corresponding to the magnetic anisotropy ~2.9 × 10⁴ erg/cm³. Electrochemical studies showed that a specific capacitance of ~600 F g⁻¹ was observed from the cyclic voltammetry and galvanostatic charge–discharge, which suggested its utilization as a potential electrode for supercapacitor applications. Full article

(This article belongs to the Special Issue Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism)

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Open AccessArticle

Mo₂C-Loaded Porous Carbon Nanosheets as a Multifunctional Separator Coating for High-Performance Lithium–Sulfur Batteries

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Materials 2023, 16(4), 1635; https://doi.org/10.3390/ma16041635 - 15 Feb 2023

Cited by 1 | Viewed by 997

Abstract

Lithium–sulfur batteries have emerged as one of the promising next-generation energy storage devices. However, the dissolution and shuttling of polysulfides in the electrolyte leads to a rapid decrease in capacity, severe self-discharge, and poor high-temperature performance. Here, we demonstrate the design and preparation of a Mo₂C nanoparticle-embedded carbon nanosheet matrix material (Mo₂C/C) and its application in lithium–sulfur battery separator modification. As a polar catalyst, Mo₂C/C can effectively adsorb and promote the reversible conversion of lithium polysulfides, suppress the shuttle effect, and improve the electrochemical performance of the battery. The lithium–sulfur battery with the Mo₂C/C =-modified separator showed a good rate of performance with high specific capacities of 1470 and 799 mAh g⁻¹ at 0.1 and 2 C, respectively. In addition, the long-cycle performance of only 0.09% decay per cycle for 400 cycles and the stable cycling under high sulfur loading indicate that the Mo₂C/C-modified separator holds great promise for the development of high-energy-density lithium–sulfur batteries. Full article

(This article belongs to the Special Issue Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism)

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Open AccessArticle

One-Step Synthesis of LiCo_1-1.5xY_xPO₄@C Cathode Material for High-Energy Lithium-ion Batteries

and

Materials 2022, 15(20), 7325; https://doi.org/10.3390/ma15207325 - 20 Oct 2022

Viewed by 835

Abstract

Intrinsically low ion conductivity and unstable cathode electrolyte interface are two important factors affecting the performances of LiCoPO₄ cathode material. Herein, a series of LiCo_1-1.5xY_xPO₄@C (x = 0, 0.01, 0.02, 0.03) cathode material is synthesized by a one-step method. The influence of Y substitution amount is optimized and discussed. The structure and morphology of LiCo_1-1.5xY_xPO₄@C cathode material does not lead to obvious changes with Y substitution. However, the Li/Co antisite defect is minimized and the ionic and electronic conductivities of LiCo_1-1.5xY_xPO₄@C cathode material are enhanced by Y substitution. The LiCo_0.97Y_0.02PO₄@C cathode delivers a discharge capacity of 148 mAh g⁻¹ at 0.1 C and 96 mAh g⁻¹ at 1 C, with a capacity retention of 75% after 80 cycles at 0.1 C. Its good electrochemical performances are attributed to the following factors. (1) The uniform 5 nm carbon layer stabilizes the interface and suppresses the side reactions with the electrolyte. (2) With Y substitution, the Li/Co antisite defect is decreased and the electronic and ionic conductivity are also improved. In conclusion, our work reveals the effects of aliovalent substitution and carbon coating in LiCo_1-1.5xY_xPO₄@C electrodes to improve their electrochemical performances, and provides a method for the further development of high voltage cathode material for high-energy lithium-ion batteries. Full article

(This article belongs to the Special Issue Investigation of High-Performance Electrode Materials: Processing and Storage Mechanism)

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