Identification of electrochemical reaction products in lithium–oxygen cells with 7Li nutation spectroscopy

In the Li–O 2 battery system, it is has been shown to be challenging to differentiate the discharge products or determine the electrolyte stability with direct 7 Li NMR. Defined 7 Li quadrupole lineshapes are not observed for cycled cathodes. Here, 7 Li nutation NMR is demonstrated to be an effective method for the identification of Li 2 O 2 in cycled cathodes. The 7 Li quadrupole interaction of Li 2 O 2 (35 kHz) and Li 2 CO 3 (120 kHz) are of …