Extended Data Fig. 5: NMR spectra.
From: LiMnO2 cathode stabilized by interfacial orbital ordering for sustainable lithium-ion batteries
a, The first charge–discharge curve of the Mn3O4 nanoarray electrode at a current density of 0.05 A g−1 in the voltage range between 2.0 and 4.5 V (vs. Li/Li+). b, Ex situ 31P NMR spectra for electrolyte solutions of Mn3O4//Li cells collected at different states. A single resonance at δ –13 (corresponding to Mn2+) can be observed in the 31P NMR spectra for the electrolytes of the Mn3O4//Li cells at different charge states except for the starting point, indicating the existence of Mn2+ in the electrolyte and Mn2+ deintercalation from the Mn3O4 electrode during the charge process.
