Nature Communications (Nov 2018)

A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage

  • Hui Xia,
  • Xiaohui Zhu,
  • Jizi Liu,
  • Qi Liu,
  • Si Lan,
  • Qinghua Zhang,
  • Xinyu Liu,
  • Joon Kyo Seo,
  • Tingting Chen,
  • Lin Gu,
  • Ying Shirley Meng

DOI
https://doi.org/10.1038/s41467-018-07595-y
Journal volume & issue
Vol. 9, no. 1
pp. 1 – 10

Abstract

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Layered Na x MnO2 cathode suffers from structural instability and sluggish kinetics. Here the authors show a method to yield monoclinic NaMn2−y−δ(OH)2y, a new polymorph of Na-birnessite with maximum Na occupancy and enlarged interlayer spacing, enabling outstanding cyclability and rate performance.