Muon studies of Li⁺ diffusion in LiFePO₄ nanoparticles of different polymorphs

Abstract

Lithium diffusion investigation of nanostructured olivine LiFePO4 for the first time using muon spectroscopy (μSR).

A first-principles study on Si24 as an anode material for rechargeable batteries

“…Moreover, high-pressure induced phase transformations of several electrode materials, e.g., Li x MPO 4 (M ¼ Fe and Co), 8,9 16 In addition to these high-pressure polymorphs of current electrode materials, many novel alkali compounds with an open-channel structure have been derived at high pressure. 12,[17][18][19] It has been proven that these channels likely provide a diffusion path for the alkali ions and lead to high ionic conductivities.…”

Ultra-rapid microwave synthesis of Li3−x−yMxN (M = Co, Ni and Cu) nitridometallates

“…typical N-H bands from the NH 2− group were not observed in either the Raman or IR spectra of the as-formed materials). 28,29 The properties of the metal and nitride starting materials are thus important in being able to design a microwave reaction without an external susceptor (such as carbon, typically) and thus minimise possible contamination of products. The presence of naturally abundant hydrogen at implied concentrations approaching 20% could not be detected in our PND measurements either from negative peaks in difference Fourier maps (given its scattering length of b = −3.75 fm) or from an increased background (arising from its large incoherent scattering cross section).…”

Calendering effect on the electrochemical performances of the thick Li-ion battery electrodes using a three dimensional Ni alloy foam current collector

“…Lithium iron phosphate (LiFePO 4 ) as a very promising active material attracts much attention for electrical vehicles because of its low toxicity, high safety, potentially low cost, excellent life cycle, high structural stability, and large theoretical capacity (170 mA h g À1 ), among others [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, the kinetic performance of LiFePO 4 suffers significantly from poor electronic conductivity and slow lithium-ion transport.…”

“…However, the kinetic performance of LiFePO 4 suffers significantly from poor electronic conductivity and slow lithium-ion transport. To overcome the disadvantages, the performance was improved by decreasing the particle size, performing a surface modification, doping with other elements, coating with conductive material, and so on [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Nevertheless, to be useful for electric vehicles or high power energy storage, the active material of a Li-ion battery should be coated with a foil type current collector that is much thinner, and its electrode area should be large enough to meet the high power performance with a sufficient capacity.…”