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Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries
High-capacity and high-voltage cathode materials are required to meet the increasing demand for energy density in Li ion batteries. Lithium iron silicate (Li(2)FeSiO(4)) is a cathode material with a high theoretical capacity of 331 mAh·g(−1). However, its poor conductivity and low Li ion diffusion c...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9143007/ https://www.ncbi.nlm.nih.gov/pubmed/35629572 http://dx.doi.org/10.3390/ma15103545 |
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author | Li, Huaifu Li, Yunsong Cheng, Xuan Gong, Chaoyang |
author_facet | Li, Huaifu Li, Yunsong Cheng, Xuan Gong, Chaoyang |
author_sort | Li, Huaifu |
collection | PubMed |
description | High-capacity and high-voltage cathode materials are required to meet the increasing demand for energy density in Li ion batteries. Lithium iron silicate (Li(2)FeSiO(4)) is a cathode material with a high theoretical capacity of 331 mAh·g(−1). However, its poor conductivity and low Li ion diffusion coefficient result in poor capability, hindering practical applications. Morphology has an important influence on the properties of materials, and nanomaterials with hollow structures are widely used in electrochemical devices. Herein, we report a novel hollow hemispherical Li(2)FeSiO(4) synthesized by a template-free hydrothermal method with the addition of ascorbic acid. The hollow hemispherical Li(2)FeSiO(4) consisted of finer particles with a shell thickness of about 80 nm. After carbon coating, the composite was applied as the cathode in Li ion batteries. As a result, the hollow hemispherical Li(2)FeSiO(4)/C exhibited a discharge capacity as high as 192 mAh·g(−1) at 0.2 C, and the average capacities were 134.5, 115.5 and 93.4 mAh·g(−1) at 0.5, 1 and 2 C, respectively. In addition, the capacity increased in the first few cycles and then decayed with further cycling, showing a warm-up like behavior, and after 160 cycles the capacities maintained 114.2, 101.6 and 79.3 mAh·g(−1) at 0.5, 1 and 2 C, respectively. Such a method of adding ascorbic acid in the hydrothermal reaction can effectively synthesize hollow hemispherical Li(2)FeSiO(4) with the enhanced electrochemical performance. |
format | Online Article Text |
id | pubmed-9143007 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-91430072022-05-29 Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries Li, Huaifu Li, Yunsong Cheng, Xuan Gong, Chaoyang Materials (Basel) Article High-capacity and high-voltage cathode materials are required to meet the increasing demand for energy density in Li ion batteries. Lithium iron silicate (Li(2)FeSiO(4)) is a cathode material with a high theoretical capacity of 331 mAh·g(−1). However, its poor conductivity and low Li ion diffusion coefficient result in poor capability, hindering practical applications. Morphology has an important influence on the properties of materials, and nanomaterials with hollow structures are widely used in electrochemical devices. Herein, we report a novel hollow hemispherical Li(2)FeSiO(4) synthesized by a template-free hydrothermal method with the addition of ascorbic acid. The hollow hemispherical Li(2)FeSiO(4) consisted of finer particles with a shell thickness of about 80 nm. After carbon coating, the composite was applied as the cathode in Li ion batteries. As a result, the hollow hemispherical Li(2)FeSiO(4)/C exhibited a discharge capacity as high as 192 mAh·g(−1) at 0.2 C, and the average capacities were 134.5, 115.5 and 93.4 mAh·g(−1) at 0.5, 1 and 2 C, respectively. In addition, the capacity increased in the first few cycles and then decayed with further cycling, showing a warm-up like behavior, and after 160 cycles the capacities maintained 114.2, 101.6 and 79.3 mAh·g(−1) at 0.5, 1 and 2 C, respectively. Such a method of adding ascorbic acid in the hydrothermal reaction can effectively synthesize hollow hemispherical Li(2)FeSiO(4) with the enhanced electrochemical performance. MDPI 2022-05-16 /pmc/articles/PMC9143007/ /pubmed/35629572 http://dx.doi.org/10.3390/ma15103545 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Huaifu Li, Yunsong Cheng, Xuan Gong, Chaoyang Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries |
title | Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries |
title_full | Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries |
title_fullStr | Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries |
title_full_unstemmed | Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries |
title_short | Hollow Hemispherical Lithium Iron Silicate Synthesized by an Ascorbic Acid-Assisted Hydrothermal Method as a Cathode Material for Li Ion Batteries |
title_sort | hollow hemispherical lithium iron silicate synthesized by an ascorbic acid-assisted hydrothermal method as a cathode material for li ion batteries |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9143007/ https://www.ncbi.nlm.nih.gov/pubmed/35629572 http://dx.doi.org/10.3390/ma15103545 |
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