Abstract
Charge distributions of lithium cobalt nitrides Li 2.6Co 0.4N and Li 1.0Co 0.4N were investigated using core-level electron energy loss spectroscopy. The N- K spectra of Li 2.6Co 0.4N and reference sample Li 3N showed that both lithium and cobalt are monovalent in Li 2.6Co 0.4N. The N- K spectrum of electrochemically lithium-extracted Li 1.0Co 0.4N indicated that a large amount of holes are introduced into nitrogen 2 p orbitals by the lithium extraction and that Li 1.0Co 0.4N reveals a strongly covalent character. The branching ratio of the Co- L spectrum of Li 1.0Co 0.4N was almost intermediate between those of typical oxides having high- and low-spin ground states. This is attributed to the mixing of several electron configurations due to the covalency between cobalt and nitrogen.
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