% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Jo:903991,
      author       = {Jo, Chang-Heum and Voronina, Natalia and Kim, Hee Jae and
                      Yashiro, Hitoshi and Yaqoob, Najma and Guillon, Olivier and
                      Kaghazchi, Payam and Myung, Seung-Taek},
      title        = {{B}io‐{D}erived {S}urface {L}ayer {S}uitable for {L}ong
                      {T}erm {C}ycling {N}i‐{R}ich {C}athode for
                      {L}ithium‐{I}on {B}atteries},
      journal      = {Small},
      volume       = {17},
      number       = {47},
      issn         = {1613-6810},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-05561},
      pages        = {2104532 -},
      year         = {2021},
      abstract     = {Since Ni-rich cathode material is very sensitive to
                      moisture and easily forms residual lithium compounds that
                      degrade cell performance, it is very important to pay
                      attention to the selection of the surface modifying media.
                      Accordingly, hydroxyapatite (Ca5(PO4)3(OH)), a tooth-derived
                      material showing excellent mechanical and thermodynamic
                      stabilities, is selected. To verify the availability of
                      hydroxyapatite as a surface protection material,
                      lithium-doped hydroxyapatite, Ca4.67Li0.33(PO4)3(OH), is
                      formed with ≈10-nm layer after reacting with residual
                      lithium compounds on Li[Ni0.8Co0.15Al0.05]O2, which
                      spontaneously results in dramatic reduction of surface
                      lithium residues to 2879 ppm from 22364 ppm. The
                      Ca4.67Li0.33(PO4)3(OH)-modified Li[Ni0.8Co0.15Al0.05]O2
                      electrode provides ultra-long term cycling stability,
                      enabling 1000 cycles retaining $66.3\%$ of its initial
                      capacity. Also, morphological degradations such as
                      micro-cracking or amorphization of surface are significantly
                      suppressed by the presence of Ca4.67Li0.33(PO4)3(OH) layer
                      on the Li[Ni0.8Co0.15Al0.05]O2, of which the
                      Ca4.67Li0.33(PO4)3(OH) is transformed to CaF2 via
                      Ca4.67Li0.33(PO4)3F during the long term cycles reacting
                      with HF in electrolyte. In addition, the authors’ density
                      function theory (DFT) results explain the reason of
                      instability of NCA and why CaF2 layers can delay the
                      micro-cracking during electrochemical reaction. Therefore,
                      the stable Ca4.67Li0.33(PO4)3F and CaF2 layers play a
                      pivotal role to protect the Li[Ni0.8Co0.15Al0.05]O2 with
                      ultra-long cycling stability.},
      cin          = {IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1221 - Fundamentals and Materials (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1221},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34677913},
      UT           = {WOS:000709875900001},
      doi          = {10.1002/smll.202104532},
      url          = {https://juser.fz-juelich.de/record/903991},
}