Publication

Lithium diffusive behavior in Li2MnO3 detected by muon-spin relaxation

Martin Mansson
2014
Conference Papers

Abstract

In a paramagnetic state of Li2MnO3, i.e. at temperatures above T-N = 35 K, muon-spin relaxation (mu+SR) measurements with zero applied magnetic field (ZF) and longitudinal-field (LF) revealed the presence of a dynamic fluctuation of a nuclear magnetic field due to Li+-diffusion. From the motional narrowing behavior of the field distribution width, the Li+ ions were found to diffuse mainly along the c-axis through the Li+ ion in the [Li1/3Mn2/3]O-2 layer. Also, based on the field fluctuation rate, a self-diffusion coefficient of Li+ ions (D-Li) at 300 K was estimated as 4.7(4) x 10(-11) cm(2)/s with the thermal activation energy E-alpha = 0.156(3)eV. (C) 2013 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/4121dd24-a483-4ef3-b6c5-a987cd9cee64

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Martin Mansson
2014
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4121dd24-a483-4ef3-b6c5-a987cd9cee64

About this result

Related concepts (18)

Lithium-ion battery

A lithium-ion or Li-ion battery is a type of rechargeable battery which uses the reversible reduction of lithium ions to store energy. The negative electrode of a conventional lithium-ion cell is typically graphite, a form of carbon. This negative electrode is sometimes called the anode as it acts as an anode during discharge. The positive electrode is typically a metal oxide; the positive electrode is sometimes called the cathode as it acts as a cathode during discharge.

Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. This process occurs near resonance, when the oscillation frequency matches the intrinsic frequency of the nuclei, which depends on the strength of the static magnetic field, the chemical environment, and the magnetic properties of the isotope involved; in practical applications with static magnetic fields up to ca.

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The lithium–air battery (Li–air) is a metal–air electrochemical cell or battery chemistry that uses oxidation of lithium at the anode and reduction of oxygen at the cathode to induce a current flow. Pairing lithium and ambient oxygen can theoretically lead to electrochemical cells with the highest possible specific energy. Indeed, the theoretical specific energy of a non-aqueous Li–air battery, in the charged state with Li2O2 product and excluding the oxygen mass, is ~40.1 MJ/kg = 11.14 kWh/kg of lithium.

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