Effect of chromium substitution on the local structure and insertion chemistry of spinel lithium manganates: investigation by x-ray absorption fine structure spectroscopy

Article Abstract:

The substitution of chromium in lithium manganate spinels having a composition of LiCrxMn2-xO4 has been studied in relation to the lithium extraction and insertion reactions. X-ray absorption near-edge structure spectroscopy is used in investigating the local structural environments and electronic states of chromium and manganese. It has been observed that substituted Cr forms Cr3+ ions at the Mn site and the Cr ions remain in the trivalent state during lithium extraction and insertion.

Analysis, Lithium, Lithium (Metal), Substitution reactions, Spinel

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Experimental and computational study of the electronic structural changes in LiTi2O4 spinel compounds upon electrochemical Li insertion reactions

Article Abstract:

X-ray absorption spectroscopy (XAS) measurements and first principle calculations based on spin-polarized density functional theory was used to investigate electronic structural changes in LiTi2O4 spinel compounds upon electrochemical lithium insertions. It was indicated that oxide ions and titanium ions are involved in electronic structural changes caused by electrochemical lithium ion insertions.

Titanium dioxide, Density functionals, Density functional theory, Structure

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Muon spin relaxation study of spinel lithium manganese oxides

Article Abstract:

The muon spin relaxation technique was used to study spinel lithium manganate insertion compounds. The results clearly reflect the presence of protons in H(super +)-MnO2 and the movement of lithium ions in both lithium manganates.

Manganese Dioxide, Chemistry, Physical and theoretical, Physical chemistry

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