Highly Conducting Li(Fe1−xMnx)0.88V0.08PO4 Cathode Materials Nanocrystallized from the Glassy State (x = 0.25, 0.5, 0.75)

This study showed that thermal nanocrystallization of glassy analogs of LiFe<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo>...

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Autores principales:	Justyna E. Frąckiewicz, Tomasz K. Pietrzak
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nanocrystallization high conductivity electron hopping olivine cathode materials Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/74a7cb78d570406fb838bb2c4395a0ec
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spelling	oai:doaj.org-article:74a7cb78d570406fb838bb2c4395a0ec2021-11-11T18:00:50ZHighly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)10.3390/ma142164341996-1944https://doaj.org/article/74a7cb78d570406fb838bb2c4395a0ec2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6434https://doaj.org/toc/1996-1944This study showed that thermal nanocrystallization of glassy analogs of LiFe<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></semantics></math></inline-formula>Mn<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mi>x</mi></msub></semantics></math></inline-formula>PO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>4</mn></msub></semantics></math></inline-formula> (with the addition of vanadium for improvement of glass forming properties) resulted in highly conducting materials that may be used as cathodes for Li-ion batteries. The glasses and nanomaterials were studied with differential thermal analysis, X-ray diffractometry, and impedance spectroscopy. The electrical conductivity of the nanocrystalline samples varied, depending on the composition. For <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>=</mo><mn>0.5</mn></mrow></semantics></math></inline-formula>, it exceeded <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula> S/cm at room temperature with an activation energy as low as 0.15 eV. The giant and irreversible increase in the conductivity was explained on the basis of Mott’s theory of electron hopping and a core-shell concept. Electrochemical performance of the active material with <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>=</mo><mn>0.5</mn></mrow></semantics></math></inline-formula> was also reported.Justyna E. FrąckiewiczTomasz K. PietrzakMDPI AGarticlenanocrystallizationhigh conductivityelectron hoppingolivinecathode materialsTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6434, p 6434 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanocrystallization high conductivity electron hopping olivine cathode materials Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	nanocrystallization high conductivity electron hopping olivine cathode materials Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Justyna E. Frąckiewicz Tomasz K. Pietrzak Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)
description	This study showed that thermal nanocrystallization of glassy analogs of LiFe<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></semantics></math></inline-formula>Mn<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mi>x</mi></msub></semantics></math></inline-formula>PO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>4</mn></msub></semantics></math></inline-formula> (with the addition of vanadium for improvement of glass forming properties) resulted in highly conducting materials that may be used as cathodes for Li-ion batteries. The glasses and nanomaterials were studied with differential thermal analysis, X-ray diffractometry, and impedance spectroscopy. The electrical conductivity of the nanocrystalline samples varied, depending on the composition. For <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>=</mo><mn>0.5</mn></mrow></semantics></math></inline-formula>, it exceeded <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula> S/cm at room temperature with an activation energy as low as 0.15 eV. The giant and irreversible increase in the conductivity was explained on the basis of Mott’s theory of electron hopping and a core-shell concept. Electrochemical performance of the active material with <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>=</mo><mn>0.5</mn></mrow></semantics></math></inline-formula> was also reported.
format	article
author	Justyna E. Frąckiewicz Tomasz K. Pietrzak
author_facet	Justyna E. Frąckiewicz Tomasz K. Pietrzak
author_sort	Justyna E. Frąckiewicz
title	Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)
title_short	Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)
title_full	Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)
title_fullStr	Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)
title_full_unstemmed	Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)
title_sort	highly conducting li(fe<sub>1−<i>x</i></sub>mn<sub><i>x</i></sub>)<sub>0.88</sub>v<sub>0.08</sub>po<sub>4</sub> cathode materials nanocrystallized from the glassy state (<i>x</i> = 0.25, 0.5, 0.75)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/74a7cb78d570406fb838bb2c4395a0ec
work_keys_str_mv	AT justynaefrackiewicz highlyconductinglifesub1ixisubmnsubixisubsub088subvsub008subposub4subcathodematerialsnanocrystallizedfromtheglassystateixi02505075 AT tomaszkpietrzak highlyconductinglifesub1ixisubmnsubixisubsub088subvsub008subposub4subcathodematerialsnanocrystallizedfromtheglassystateixi02505075
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Highly Conducting Li(Fe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>)<sub>0.88</sub>V<sub>0.08</sub>PO<sub>4</sub> Cathode Materials Nanocrystallized from the Glassy State (<i>x</i> = 0.25, 0.5, 0.75)

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