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Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries

Nano α-MnO(2) is usually synthesized under hydrothermal conditions in acidic medium, which results in materials easily undergoing thermal reduction and offers single crystals often over 100 nm in size. In this study, α-MnO(2) built up of inter-grown ultra-small nanoflakes with 10 nm thickness was pr...

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Autores principales: Kim, Kyungho, Daniel, Geoffrey, Kessler, Vadim G., Seisenbaeva, Gulaim A., Pol, Vilas G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6116270/
https://www.ncbi.nlm.nih.gov/pubmed/30096935
http://dx.doi.org/10.3390/nano8080608
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author Kim, Kyungho
Daniel, Geoffrey
Kessler, Vadim G.
Seisenbaeva, Gulaim A.
Pol, Vilas G.
author_facet Kim, Kyungho
Daniel, Geoffrey
Kessler, Vadim G.
Seisenbaeva, Gulaim A.
Pol, Vilas G.
author_sort Kim, Kyungho
collection PubMed
description Nano α-MnO(2) is usually synthesized under hydrothermal conditions in acidic medium, which results in materials easily undergoing thermal reduction and offers single crystals often over 100 nm in size. In this study, α-MnO(2) built up of inter-grown ultra-small nanoflakes with 10 nm thickness was produced in a rapid two-step procedure starting via partial reduction in solution in basic medium subsequently followed by co-proportionation in thermal treatment. This approach offers phase-pure α-MnO(2) doped with potassium (cryptomelane type K(0.25)Mn(8)O(16) structure) demonstrating considerable chemical and thermal stability. The reaction pathways leading to this new morphology and structure have been discussed. The MnO(2) electrodes produced from obtained nanostructures were tested as electrodes of lithium ion batteries delivering initial discharge capacities of 968 mAh g(−1) for anode (0 to 2.0 V) and 317 mAh g(−1) for cathode (1.5 to 3.5 V) at 20 mA g(−1) current density. At constant current of 100 mA g(−1), stable cycling of anode achieving 660 mAh g(−1) and 145 mAh g(−1) for cathode after 200 cycles is recorded. Post diagnostic analysis of cycled electrodes confirmed the electrode materials stability and structural properties.
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spelling pubmed-61162702018-08-31 Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries Kim, Kyungho Daniel, Geoffrey Kessler, Vadim G. Seisenbaeva, Gulaim A. Pol, Vilas G. Nanomaterials (Basel) Article Nano α-MnO(2) is usually synthesized under hydrothermal conditions in acidic medium, which results in materials easily undergoing thermal reduction and offers single crystals often over 100 nm in size. In this study, α-MnO(2) built up of inter-grown ultra-small nanoflakes with 10 nm thickness was produced in a rapid two-step procedure starting via partial reduction in solution in basic medium subsequently followed by co-proportionation in thermal treatment. This approach offers phase-pure α-MnO(2) doped with potassium (cryptomelane type K(0.25)Mn(8)O(16) structure) demonstrating considerable chemical and thermal stability. The reaction pathways leading to this new morphology and structure have been discussed. The MnO(2) electrodes produced from obtained nanostructures were tested as electrodes of lithium ion batteries delivering initial discharge capacities of 968 mAh g(−1) for anode (0 to 2.0 V) and 317 mAh g(−1) for cathode (1.5 to 3.5 V) at 20 mA g(−1) current density. At constant current of 100 mA g(−1), stable cycling of anode achieving 660 mAh g(−1) and 145 mAh g(−1) for cathode after 200 cycles is recorded. Post diagnostic analysis of cycled electrodes confirmed the electrode materials stability and structural properties. MDPI 2018-08-09 /pmc/articles/PMC6116270/ /pubmed/30096935 http://dx.doi.org/10.3390/nano8080608 Text en © 2018 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
Kim, Kyungho
Daniel, Geoffrey
Kessler, Vadim G.
Seisenbaeva, Gulaim A.
Pol, Vilas G.
Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries
title Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries
title_full Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries
title_fullStr Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries
title_full_unstemmed Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries
title_short Basic Medium Heterogeneous Solution Synthesis of α-MnO(2) Nanoflakes as an Anode or Cathode in Half Cell Configuration (vs. Lithium) of Li-Ion Batteries
title_sort basic medium heterogeneous solution synthesis of α-mno(2) nanoflakes as an anode or cathode in half cell configuration (vs. lithium) of li-ion batteries
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6116270/
https://www.ncbi.nlm.nih.gov/pubmed/30096935
http://dx.doi.org/10.3390/nano8080608
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