Supertransferred hyperfine fields at 7Li: variable temperature 7Li nuclear magnetic resonance studies of LiMn2O4-based spinels

Article Abstract:

A study was conducted to measure the temperature dependence of the 7Li nuclear magnetic shift for LiMn2O4-based spinels. Field and temperature-dependent magnetic susceptibility measurements were carried out between 10 K and 350 K. A home-built variable temperature probe and spectrometer were utilized to perform the solid-state 7Li nuclear magnetic resonance studies. Experimental results indicated that replacing manganese with cobalt or nickel generated a larger supertransferred hyperfine field at the nuclei of 7Li.

Usage, Nuclear magnetic resonance spectroscopy, Lithium, Lithium (Metal), Spinel group

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Electric structure of chemically-prepared Li(sub x)Mn2O4 determined by Mn X-ray absorption and emission spectroscopies

Article Abstract:

Mn K-edge x-ray Absorption and Mn L-edge emission spectroscopies on LiMn2O4, its chemically delithiated and lithiated derivatives (alpha-MnO2 and Li2MnO4, respectively), and two Mn(super 3+) spinel model compounds are performed to understand the associated changes in atomic and electronic structure occurring when LiMn2O4 is used in a rechargeable lithium cell. An increase in covalency through Mn L-edge X-ray Emission Spectroscopy measurements is confirmed.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Lithium Compounds, Manganese Compounds

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Structural investigations of LiFePO4 electrodes by Fe X-ray absorption spectroscopy

Article Abstract:

Fe K-edge X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption fine structure (EXAFS) are used to study the stability and the changes in the local atomic and the electronic structure upon repeated electrochemical cycling(repeated charging and discharging). As the structure of the LiFePO4 cycled electrodes does not change even after repeated cycling it can thus be used for long life Li-ion battery applications.

Primary Battery Manufacturing, Primary batteries, dry and wet, Lithium Dry Cell Batteries, Analysis, X-ray spectroscopy, Chemistry, Physical and theoretical, Physical chemistry, Lithium cells, Lithium batteries, Electrodes, Structure

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