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@ARTICLE{Risthaus:851211,
      author       = {Risthaus, Tim and Zhou, Dong and Cao, Xia and He, Xin and
                      Qiu, Bao and Wang, Jun and Zhang, Li and Liu, Zhaoping and
                      Paillard, Elie and Schumacher, Gerhard and Winter, Martin
                      and Li, Jie},
      title        = {{A} high-capacity {P}2 {N}a 2/3 {N}i 1/3 {M}n 2/3 {O} 2
                      cathode material for sodium ion batteries with oxygen
                      activity},
      journal      = {Journal of power sources},
      volume       = {395},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2018-04911},
      pages        = {16 - 24},
      year         = {2018},
      abstract     = {Na2/3Ni1/3Mn2/3O2 with a P2 phase is investigated as a
                      cathod material for sodium ion batteries. It delivers a high
                      discharge capacity of 228 mAh g−1 within 1.5–4.5 V
                      in half cells, which is much higher than the theoretical
                      value of 172 mAh g−1. Metal K-edge X-ray absorption near
                      edge spectroscopy results show that the Mn ions remain in 4
                      + oxidation state during sodiation/desodiation and the
                      charge compensation is due to the Ni2+/Ni4+ redox. Soft
                      X-ray absorption spectroscopy results reveals a gradient in
                      the valence state of Ni ions from bulk to surface for the
                      charged electrode, and a change in the integrated intensity
                      of O K-edge peak after charging, strongly suggesting that
                      part of the charge compensation takes place at the oxygen
                      sites. In addition, the reduction of Mn ions on the surface
                      is observed on the discharged electrode, which indicates
                      that the carbonate-based electrolyte reacts with the cathode
                      material, resulting in a fast capacity drop. By utilizing an
                      ionic liquid (IL) electrolyte (1 M NaTFSI in Pyr14TFSI) to
                      reduce the interfacial reactions, the discharge capacity of
                      ∼200 mAh g−1 is retained.},
      cin          = {IEK-12},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-12-20141217},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000438001800003},
      doi          = {10.1016/j.jpowsour.2018.05.026},
      url          = {https://juser.fz-juelich.de/record/851211},
}