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@ARTICLE{Surendran:637195,
      author       = {Surendran, Ammu and Thottungal, Aswathi and Enale, Harsha
                      and Dixon, Ditty and Sarapulova, Angelina and Knapp, Michael
                      and Missyul, Alexander and Bhaskar, Aiswarya},
      title        = {{I}nsights into the {R}edox {C}hemistry and {S}tructural
                      {E}volution of a {P}2-{T}ype {C}athode {M}aterial in
                      {S}odium-{I}on {B}atteries},
      journal      = {Chemistry of materials},
      volume       = {37},
      number       = {4},
      issn         = {0897-4756},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {PUBDB-2025-03804},
      pages        = {1588 - 1599},
      year         = {2025},
      note         = {Waiting for fulltext},
      abstract     = {In view of the tunable composition and higher theoretical
                      capacity, layered transition metal oxide cathode materials
                      (Na$_x$TMO$_2$, TM: transition metal) have attained
                      substantial attention. In this work, a P2-type layered metal
                      oxide with the nominal composition
                      Na$_{0.67}$Fe$_{0.20}$Ni$_{0.15}$Mn$_{0.65}$O$_2$ (NFNM) was
                      synthesized via a sol–gel method; electrochemical
                      performance and the operating mechanism of the electrode
                      material in half-cells were investigated. The material
                      delivered an initial discharge capacity of 166 mA h
                      g$^{–1}$ where the capacity retention after 50 cycles is
                      65\% when cycled in the voltage range 1.50–4.30 V at a
                      C-rate of C/20. At 1C, the capacity delivered by the
                      material was 110 mA h g$^{–1}$ and the capacity retention
                      noted after 80 cycles was 80\%. A combination of in operando
                      synchrotron diffraction and X-ray absorption spectroscopy
                      (XAS) elucidates the electrochemical mechanism in a Na/NFNM
                      half-cell. The structural evolution of the electrode
                      material was analyzed using in operando XRD from which the
                      evidence of reversible P2-Z phase transformations was
                      obtained. Investigation of the charge-compensation mechanism
                      and local structure changes in the electrode material during
                      cycling were carried out via the XAS technique which
                      revealed the coupled Fe migration, anionic activity, and
                      phase transformations.},
      cin          = {DOOR ; HAS-User},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / DFG project
                      G:(GEPRIS)390874152 - EXC 2154: POLiS - Post Lithium Storage
                      Cluster of Excellence (390874152)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(GEPRIS)390874152},
      experiment   = {EXP:(DE-H253)P-P65-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1021/acs.chemmater.4c03201},
      url          = {https://bib-pubdb1.desy.de/record/637195},
}