Significance and Impact The work provides a pathway for optimizing Lirich cathode performance by controlling how their atomic structure evolves as a battery charges and discharges Research Details ID: 704424
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Scientific AchievementResearchers showed how the chemical processes that give Li-rich cathodes high capacity are also linked to changes in atomic structure that sap performance.Significance and ImpactThe work provides a pathway for optimizing Li-rich cathode performance by controlling how their atomic structure evolves as a battery charges and discharges.Research DetailsX-ray spectroscopic, microscopic, and structural probes were used to determine how the cathode’s atomic and chemical structure changed during charge/discharge.The results suggest a new strategy for improved cycling performance whereby the oxygen redox chemistry is tuned through structural modifications rather than the more common covalency modifications.
Publication about this research: W.E. Gent, K. Lim, Y. Liang, Q. Li, T. Barnes, S.-J. Ahn, K.H. Stone, M. McIntire, J. Hong, J.H. Song, Y. Li, A. Mehta, S. Ermon, T. Tyliszczak, D. Kilcoyne, D. Vine, J.-H. Park, S.-K. Doo, M.F. Toney, W. Yang, D. Prendergast, and W.C. Chueh, Nat. Commun. 8, 2091 (2017). Work was performed at Lawrence Berkeley National Laboratory, ALS Beamlines 8.0.1, 11.0.2, and 5.3.2.2, and at SLAC National Accelerator Laboratory, SSRL Beamlines 4-1 and 7-2. Operation of the ALS is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences program.
A Path to a Game-Changing Battery Electrode
Resonant inelastic x-ray scattering (RIXS) maps. The unique emission signature after charging to 4.60 V (indicated by the white arrow) provides a reliable fingerprint of the intrinsic O redox in batteries.