The dilemma of the high capacity and low stability of a battery system is much associated with the oxygen activities involved in the electrochemical operation. In the meantime, reversible oxygen redox has been proposed to be useful for improving the energy density of the battery cathode, which remains the bottleneck of the overall performance in commercially viable batteries. In this presentation, we will briefly introduce our recent developments of high-efficiency mRIXS and show that mRIXS of the transiting-metal oxide based battery cathode materials enables a reliable probe of the intrinsic lattice oxygen redox reactions. A large amount of mRIXS results will be discussed to clarify that oxygen activities involved in battery operations are of multiple characters. More importantly, the reversible lattice oxygen redox reactions should not be taken simply as the culprit of the performance decay. Instead, it seems other irreversible types of oxygen “oxidation”, which are often inappropriately taken as evidences of oxygen “redox”, such as oxygen release and surface reactions, are responsible for the majority of the stability issues including voltage and capacity fade. The distinction of the different types of oxygen activities is critical for revealing the true nature and character of the oxygen reactions at high voltage, which is directly related with the stability issue of high energy density batteries.

Oxygen redox activities in battery electrodes studied by mapping of resonant inelastic X-ray scattering (mRIXS)

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.