Extended Data Fig. 7: NMR spectra after testing.
From: LiMnO2 cathode stabilized by interfacial orbital ordering for sustainable lithium-ion batteries
a, Cycle performances of the SPL-LMO and LiMn2O4 nanowall arrays cathodes at 55 °C between 2.0 and 4.5 V. b, 31P NMR spectrum for the electrolyte solution of the LiMn2O4//Li cell collected after 100 cycles at 55 °C in comparison with the 31P NMR spectra for the electrolyte solutions of the SPL-LMO//Li cells after 600 cycles at 55 °C and after 2000 cycles at 25 °C, respectively. It is noted that a much stronger resonance in the NMR at δ –10 (corresponding to Mn3+) is observed for the electrolyte after 600 cycles at 55 °C as compared to that for the electrolyte after 2000 cycles at 25 °C, indicating Mn dissolution is highly dependent on the testing temperature.
