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Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries
Li(3)V(2)(PO(4))(3−x)Br(x)/carbon (x = 0.08, 0.14, 0.20, and 0.26) composites as cathode materials for lithium-ion batteries were prepared through partially substituting PO(4)(3−) with Br(−), via a rheological phase reaction method. The crystal structure and morphology of the as-prepared composites...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5388154/ https://www.ncbi.nlm.nih.gov/pubmed/28336886 http://dx.doi.org/10.3390/nano7030052 |
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author | Cao, Xiaoyu Mo, Lulu Zhu, Limin Xie, Lingling |
author_facet | Cao, Xiaoyu Mo, Lulu Zhu, Limin Xie, Lingling |
author_sort | Cao, Xiaoyu |
collection | PubMed |
description | Li(3)V(2)(PO(4))(3−x)Br(x)/carbon (x = 0.08, 0.14, 0.20, and 0.26) composites as cathode materials for lithium-ion batteries were prepared through partially substituting PO(4)(3−) with Br(−), via a rheological phase reaction method. The crystal structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and electrochemical properties were evaluated by charge/discharge cycling and electrochemical impedance spectroscopy (EIS). XRD results reveal that the Li(3)V(2)(PO(4))(3−x)Br(x)/carbon composites with solid solution phase are well crystallized and have the same monoclinic structure as the pristine Li(3)V(2)(PO(4))(3)/carbon composite. It is indicated by SEM images that the Li(3)V(2)(PO(4))(3−x)Br(x)/carbon composites possess large and irregular particles, with an increasing Br(−) content. Among the Li(3)V(2)(PO(4))(3−x)Br(x)/carbon composites, the Li(3)V(2)(PO(4))(2.86)Br(0.14)/carbon composite shows the highest initial discharge capacity of 178.33 mAh·g(−1) at the current rate of 30 mA·g(−1) in the voltage range of 4.8–3.0 V, and the discharge capacity of 139.66 mAh·g(−1) remains after 100 charge/discharge cycles. Even if operated at the current rate of 90 mA·g(−1), Li(3)V(2)(PO(4))(2.86)Br(0.14)/carbon composite still releases the initial discharge capacity of 156.57 mAh·g(−1), and the discharge capacity of 123.3 mAh·g(−1) can be maintained after the same number of cycles, which is beyond the discharge capacity and cycleability of the pristine Li(3)V(2)(PO(4))(3)/carbon composite. EIS results imply that the Li(3)V(2)(PO(4))(2.86)Br(0.14)/carbon composite demonstrates a decreased charge transfer resistance and preserves a good interfacial compatibility between solid electrode and electrolyte solution, compared with the pristine Li(3)V(2)(PO(4))(3)/carbon composite upon cycling. |
format | Online Article Text |
id | pubmed-5388154 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-53881542017-04-13 Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries Cao, Xiaoyu Mo, Lulu Zhu, Limin Xie, Lingling Nanomaterials (Basel) Article Li(3)V(2)(PO(4))(3−x)Br(x)/carbon (x = 0.08, 0.14, 0.20, and 0.26) composites as cathode materials for lithium-ion batteries were prepared through partially substituting PO(4)(3−) with Br(−), via a rheological phase reaction method. The crystal structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and electrochemical properties were evaluated by charge/discharge cycling and electrochemical impedance spectroscopy (EIS). XRD results reveal that the Li(3)V(2)(PO(4))(3−x)Br(x)/carbon composites with solid solution phase are well crystallized and have the same monoclinic structure as the pristine Li(3)V(2)(PO(4))(3)/carbon composite. It is indicated by SEM images that the Li(3)V(2)(PO(4))(3−x)Br(x)/carbon composites possess large and irregular particles, with an increasing Br(−) content. Among the Li(3)V(2)(PO(4))(3−x)Br(x)/carbon composites, the Li(3)V(2)(PO(4))(2.86)Br(0.14)/carbon composite shows the highest initial discharge capacity of 178.33 mAh·g(−1) at the current rate of 30 mA·g(−1) in the voltage range of 4.8–3.0 V, and the discharge capacity of 139.66 mAh·g(−1) remains after 100 charge/discharge cycles. Even if operated at the current rate of 90 mA·g(−1), Li(3)V(2)(PO(4))(2.86)Br(0.14)/carbon composite still releases the initial discharge capacity of 156.57 mAh·g(−1), and the discharge capacity of 123.3 mAh·g(−1) can be maintained after the same number of cycles, which is beyond the discharge capacity and cycleability of the pristine Li(3)V(2)(PO(4))(3)/carbon composite. EIS results imply that the Li(3)V(2)(PO(4))(2.86)Br(0.14)/carbon composite demonstrates a decreased charge transfer resistance and preserves a good interfacial compatibility between solid electrode and electrolyte solution, compared with the pristine Li(3)V(2)(PO(4))(3)/carbon composite upon cycling. MDPI 2017-02-24 /pmc/articles/PMC5388154/ /pubmed/28336886 http://dx.doi.org/10.3390/nano7030052 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Cao, Xiaoyu Mo, Lulu Zhu, Limin Xie, Lingling Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries |
title | Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries |
title_full | Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries |
title_fullStr | Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries |
title_full_unstemmed | Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries |
title_short | Preparation and Electrochemical Properties of Li(3)V(2)(PO(4))(3−x)Br(x)/Carbon Composites as Cathode Materials for Lithium-Ion Batteries |
title_sort | preparation and electrochemical properties of li(3)v(2)(po(4))(3−x)br(x)/carbon composites as cathode materials for lithium-ion batteries |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5388154/ https://www.ncbi.nlm.nih.gov/pubmed/28336886 http://dx.doi.org/10.3390/nano7030052 |
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