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@ARTICLE{Thottungal:641789,
      author       = {Thottungal, Aswathi and Surendran, Ammu and Enale, Harsha
                      and Sarapulova, Angelina and Ganesan, Muthucharan and
                      Murugan, Paranjothi and Mangold, Stefan and Dolotko,
                      Oleksandr and Knapp, Michael and Dixon, Ditty and Bhaskar,
                      Aiswarya},
      title        = {{T}uning the upper cut-off voltage for enabling
                      {C}o$^{3+}$/{C}o$^{2+}$ redox in a {P}2/{P}3/spinel
                      composite cathode material for sodium-ion batteries: {A}n in
                      operando study},
      journal      = {Journal of power sources},
      volume       = {662},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PUBDB-2025-05199},
      pages        = {238803},
      year         = {2026},
      note         = {Waiting for fulltext},
      abstract     = {Recently, research developments on layered-spinel composite
                      cathodes have surfaced as a promising approach to improving
                      the electrochemical performance of cathode materials for
                      sodium-ion batteries (SIBs). Here, a P2/P3 layered-spinel
                      composite, (P2/P3-LS-Na1/2Mn2/3Ni1/6Co1/6O2 (LS-NMNC)), has
                      been synthesized and evaluated as a promising cathode
                      material for SIBs. The material exhibited distinct
                      electrochemical characteristics across different voltage
                      ranges of 1.50–4.00 V and 1.50–4.50 V. In operando X-ray
                      diffraction and X-ray absorption spectroscopy were employed
                      to investigate the remarkable charge capacity and rapid
                      capacity degradation observed in broader voltage range. It
                      was determined that material undergoes various
                      electrochemical mechanisms when adjusting the upper cut-off
                      voltage. A unique Co3+/Co2+ redox process was activated
                      during the intercalation of sodium ions at a potential of
                      1.94 V within 1.50–4.00 V range, accompanied by a phase
                      transition from P2/P3 to P′2/O′3. This phase transition,
                      in conjunction with the Co3+/Co2+ redox process, is likely
                      responsible for the enhanced structural stability and
                      capacity exhibited by the material when upper cut-off
                      voltage is restricted. Additionally, presence of an anionic
                      redox couple and strain in the structure was noted with the
                      increase in the upper cut-off to 4.50 V, which leads to
                      instability and diminished electrochemical performance.},
      cin          = {DOOR ; HAS-User},
      ddc          = {620},
      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-P02.1-20150101 /
                      EXP:(DE-H253)P-P65-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.jpowsour.2025.238803},
      url          = {https://bib-pubdb1.desy.de/record/641789},
}