MnO Conversion in Li-Ion Batteries: In Situ Studies and the Role of Mesostructuring

ACS Applied Materials & Interfaces
Megan M ButalaRam Seshadri

Abstract

Complex manganese oxides have been extensively studied as intercalation Li-ion battery electrodes. The simple oxide MnO has been proposed as a conversion anode material with a theoretical capacity of 756 mAh g(-1) for full reduction to the metal. We report the reaction of MnO with Li using in situ X-ray diffraction and find no sign of crystalline products upon either discharge or charge. However, the absence of reflections, paired with electrochemical impedance spectroscopy, suggests disordered discharge products. We also examine composite electrodes with porous particles of MnO as the active component, with pores generated through the reductive heating of Mn3O4. We compare the behavior of these with more dense MnO powders, including studies of the electrode morphologies pre- and postcyling. We find differences in the first discharge relevant to the utility of such mesostructuring in conversion reaction materials. Specifically, we find this type of mesostructure, which gives advantage in intercalation and pseudocapacitive storage, does not yield the same benefits for conversion reaction systems.

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Citations

Oct 11, 2016·Chemical Communications : Chem Comm·Min-Kun KimYung-Eun Sung
Jan 27, 2021·Nature Communications·Xiao HuaAndrew L Goodwin
Jan 12, 2022·ACS Applied Materials & Interfaces·Christopher ChoiVicky Doan-Nguyen

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