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Hydrothermal synthesis of LiMnPO4-C(sp2) hybrids, conductive channels, and enhanced dielectric permittivity: a modulated ionic conductor

Hydrothermal synthesis of LiMnPO4-C(sp2) hybrids, conductive channels, and enhanced dielectric... A nanohybrid C-LiMnPO4 is important to tailor its electrochemical properties useful for Li+-ion batteries and photo-catalysis. In this article, we report a simple in situ C-LiMnPO4 synthesis, wherein the LiMnPO4 grows from a supersaturated solution LiOH·H2O, MnSO4·H2O, and H3PO4 in water at 200 °C in an autoclave in a hydrothermal reaction and bonds in situ to nascent carbon of a surface layer on a surface reaction with a long chain hydrocarbon used during the reaction. A phase pure C-LiMnPO4 is formed in a shape of nanorods (Pnma orthorhombic crystal structure), with 100–150 nm diameters, 150–800 nm lengths, and 2–3 nm thickness of a co-bonded C-sp2 surface layer. The LiMnPO4 rigidly co-bonds to C-sp2 via O2− in the PO4 3− polygons in a joint surface layer that a single molecular bonding extends well up to 600 °C, with a due mass loss on an extended heating in air. The sample contains fine pores with an average 3.0 nm diameter and a 9.0 m2/g surface area. At room temperature, it develops a huge dielectric permittivity ε r~1.9 × 105 near 1 Hz frequencies, which on raising the frequency decays progressively to a fairly steady ε r~1.5 × 103 at ≥1 kHz. Bare LiMnPO4 is a low dielectric phase, ε r < 10. A non-Debye type of dielectric relaxation is shown in the modulus plots. As frequency approaches to 105 Hz, nearly three orders of larger ac conductivity, 2.5 × 10−5 Scm−1 at 106 Hz, develop over a carbon-free LiMnPO4 value useful for the applications. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Hydrothermal synthesis of LiMnPO4-C(sp2) hybrids, conductive channels, and enhanced dielectric permittivity: a modulated ionic conductor

Ionics , Volume 23 (1) – Aug 24, 2016

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References (39)

Publisher
Springer Journals
Copyright
Copyright © 2016 by Springer-Verlag Berlin Heidelberg
Subject
Chemistry; Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-016-1800-4
Publisher site
See Article on Publisher Site

Abstract

A nanohybrid C-LiMnPO4 is important to tailor its electrochemical properties useful for Li+-ion batteries and photo-catalysis. In this article, we report a simple in situ C-LiMnPO4 synthesis, wherein the LiMnPO4 grows from a supersaturated solution LiOH·H2O, MnSO4·H2O, and H3PO4 in water at 200 °C in an autoclave in a hydrothermal reaction and bonds in situ to nascent carbon of a surface layer on a surface reaction with a long chain hydrocarbon used during the reaction. A phase pure C-LiMnPO4 is formed in a shape of nanorods (Pnma orthorhombic crystal structure), with 100–150 nm diameters, 150–800 nm lengths, and 2–3 nm thickness of a co-bonded C-sp2 surface layer. The LiMnPO4 rigidly co-bonds to C-sp2 via O2− in the PO4 3− polygons in a joint surface layer that a single molecular bonding extends well up to 600 °C, with a due mass loss on an extended heating in air. The sample contains fine pores with an average 3.0 nm diameter and a 9.0 m2/g surface area. At room temperature, it develops a huge dielectric permittivity ε r~1.9 × 105 near 1 Hz frequencies, which on raising the frequency decays progressively to a fairly steady ε r~1.5 × 103 at ≥1 kHz. Bare LiMnPO4 is a low dielectric phase, ε r < 10. A non-Debye type of dielectric relaxation is shown in the modulus plots. As frequency approaches to 105 Hz, nearly three orders of larger ac conductivity, 2.5 × 10−5 Scm−1 at 106 Hz, develop over a carbon-free LiMnPO4 value useful for the applications.

Journal

IonicsSpringer Journals

Published: Aug 24, 2016

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