Ex-situ 7 Li MAS NMR Study of Olivine Structured Material for Cathode of Lithium Ion Battery

Abstract

Li nuclear magnetic resonance (NMR) spectra have been observed for LiMPO4 (M = Fe, Mn) samples, as a promising cathode material of lithium ion battery. Observed 7 Li shifts of LiFe1-xMnxPO4 (x = 0, 0.6, 0.8, and 1) synthesized with solid-state reaction are compared with calculated 7 Li shift ranges based on the supertranferred hyperfine interaction of Li–O–M. Ex situ 7 Li NMR study of LiFe0.4Mn0.6PO4 in different cut-off voltage for the first charge process is also performed to understand the relationship between 7 Li