Special Issue "Electrochemical Materials in Batteries"

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

Deadline for manuscript submissions: 30 September 2020.

Special Issue Editor

Dr. Carlos Fernandez
Guest Editor
Robert Gordon University, Aberdeen, Scotland, UK
Interests: nanomaterials; graphene and graphene-based compounds; energy storage devices; 2D materials; functional materials; sensors; environmental and pharmaceutical devices
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Over the last decade, the number of batteries has dramatically increased, and consumers worldwide use more than five billion batteries for mobile phones, cameras, laptops, and electric cars. Batteries are likely to remain the first choice for energy storage devices because of their advantages, which include high energy density, low maintenance, relatively low self-discharge, high working voltage, and low toxicity. It is expected that in the next few decades, electric cars will be replacing conventional diesel/petrol or hybrid cars, and while the batteries that are currently available for this and other purposes are relatively efficient, the effort to improve on the existing technology has intensified, as companies have recognised the vast potential that exists for battery applications in the automotive and portable consumer product industries, as well as in providing solutions for the storage of energy derived from sometimes remote renewable energy generation sources.

In general, batteries are composed of two electrodes, an anode, a cathode, and an electrolyte. Usually, carbon acts as the negative electrode, with a metal oxide serving as the positive electrode. Graphite is one of the most common materials used as a negative electrode. Finding a more reliable, durable, and low cost material for electrodes has been extremely challenging, but more recently, two-dimensional (2D) materials have become the preferred option because of their significantly improved mechanical and chemical properties.

Because of their unique structural and chemical properties, 2D materials such as graphene, carbides, nitrides, oxides, and chalcogenides have attracted this broader interest, which make them promising electrode materials for new-generation batteries.

This Special Issue will be collecting different reports on the materials to be used in the development of more powerful batteries. We believe that this collection will help to create a stimulating issue on electrochemical materials for battery applications.

Yours sincerely,

Dr. Carlos Fernandez
Guest Editor

Manuscript Submission Information

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  • nanomaterials
  • graphene and graphene-based compounds
  • energy storage devices
  • electrolytes, 2D materials
  • functional materials
  • batteries

Published Papers (1 paper)

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Open AccessArticle
Effect of Ni Doping Content on Phase Transition and Electrochemical Performance of TiO2 Nanofibers Prepared by Electrospinning Applied for Lithium-Ion Battery Anodes
Materials 2020, 13(6), 1302; https://doi.org/10.3390/ma13061302 - 13 Mar 2020
Titanium dioxide (TiO2), as a potential anode material applied for lithium-ion batteries (LIBs), is constrained due to its poor theoretical specific capacity (335 mAh·g−1) and low conductivity (10−7-10−9 S·cm−1). When compared to TiO2 [...] Read more.
Titanium dioxide (TiO2), as a potential anode material applied for lithium-ion batteries (LIBs), is constrained due to its poor theoretical specific capacity (335 mAh·g−1) and low conductivity (10−7-10−9 S·cm−1). When compared to TiO2, NiO with a higher theoretical specific capacity (718 mAh·g−1) is regarded as an alternative dopant for improving the specific capacity of TiO2. The present investigations usually assemble TiO2 and NiO with a simple bilayer structure and without NiO that is immersed into the inner of TiO2, which cannot fully take advantage of NiO. Therefore, a new strategy was put forward to utilize the synergistic effect of TiO2 and NiO, namely doping NiO into the inner of TiO2. NiO-TiO2 was fabricated into the nanofibers with a higher specific surface area to further improve their electrochemical performance due to the transportation path being greatly shortened. NiO-TiO2 nanofibers are expected to replace of the commercialized anode material (graphite). In this work, a facile one-step electrospinning method, followed by annealing, was applied to synthesize the Ni-doped TiO2 nanofibers. The Ni doping content was proven to be a crucial factor affecting phase constituents, which further determined the electrochemical performance. When the Ni doping content was less than 3 wt.%, the contents of anatase and NiO were both increased, while the rutile content was decreased in the nanofibers. When the Ni doping content exceeded 3 wt.%, the opposite changes were observed. Hence, the optimum Ni doping content was determined as 3 wt.%, at which the highest weight fractions of anatase and NiO were obtained. Correspondingly, the obtained electronic conductivity of 4.92 × 10−5 S⋅cm−1 was also the highest, which was approximately 1.7 times that of pristine TiO2. The optimal electrochemical performance was also obtained. The initial discharge and charge specific capacity was 576 and 264 mAh·g−1 at a current density of 100 mA·g−1. The capacity retention reached 48% after 100 cycles, and the coulombic efficiency was about 100%. The average discharge specific capacity was 48 mAh·g−1 at a current density of 1000 mA·g−1. Approximately 65.8% of the initial discharge specific capacity was retained when the current density was recovered to 40 mA·g−1. These excellent electrochemical results revealed that Ni-doped TiO2 nanofibers could be considered to be promising anode materials for LIBs. Full article
(This article belongs to the Special Issue Electrochemical Materials in Batteries)
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