Ex-situ 7Li MAS NMR Study of Olivine Structured Material for Cathode of Lithium Ion Battery
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7Li nuclear magnetic resonance (NMR) spectra have been observed for LiMPO4 (M = Fe, Mn) samples, as a promising cathode material of lithium ion battery. Observed 7Li shifts of LiFe1-xMnxPO4 (x = 0, 0.6, 0.8, and 1) synthesized with solid-state reaction are compared with calculated 7Li shift ranges based on the supertranferred hyperfine interaction of Li–O–M. Ex situ 7Li NMR study of LiFe0.4Mn0.6PO4 in different cut-off voltage for the first charge process is also performed to understand the relationship between 7Li chemical shift and oxidation state of metals affected by delithiation process. The increment of oxidation state for metals makes to downfield shift of 7Li by influencing the supertranferred hyperfine interaction.
Abstract
7Li nuclear magnetic resonance (NMR) spectra have been observed for LiMPO4 (M = Fe, Mn) samples, as a promising cathode material of lithium ion battery. Observed 7Li shifts of LiFe1-xMnxPO4 (x = 0, 0.6, 0.8, and 1) synthesized with solid-state reaction are compared with calculated 7Li shift ranges based on the supertranferred hyperfine interaction of Li–O–M. Ex situ 7Li NMR study of LiFe0.4Mn0.6PO4 in different cut-off voltage for the first charge process is also performed to understand the relationship between 7Li chemical shift and oxidation state of metals affected by delithiation process. The increment of oxidation state for metals makes to downfield shift of 7Li by influencing the supertranferred hyperfine interaction.
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