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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

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

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Detail(s)

Original languageEnglish
Article number5100
Journal / PublicationNature Communications
Volume9
Publication statusPublished - 30 Nov 2018

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Abstract

Sodium transition metal oxides with layered structures are attractive cathode materials for sodium-ion batteries due to their large theoretical specific capacities. However, these layered oxides suffer from poor cyclability and low rate performance because of structural instability and sluggish electrode kinetics. In the present work, we show the sodiation reaction of Mn3O4 to yield crystal water free NaMnO2−y−δ(OH)2y, a monoclinic polymorph of sodium birnessite bearing Na/Mn(OH)8 hexahedra and Na/MnO6 octahedra. With the new polymorph, NaMnO2−y−δ(OH)2y exhibits an enlarged interlayer distance of about 7 Å, which is in favor of fast sodium ion migration and good structural stability. In combination of the favorable nanosheet morphology, NaMn2−y−δ(OH)2y cathode delivers large specific capacity up to 211.9 mAh g–1, excellent cycle performance (94.6% capacity retention after 1000 cycles), and outstanding rate capability (156.0 mAh g–1 at 50 C). This study demonstrates an effective approach in tailoring the structural and electrochemical properties of birnessite towards superior cathode performance in sodium-ion batteries.

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Citation Format(s)

A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage. / Xia, Hui; Zhu, Xiaohui; Liu, Jizi; Liu, Qi; Lan, Si; Zhang, Qinghua; Liu, Xinyu; Seo, Joon Kyo; Chen, Tingting; Gu, Lin; Meng, Ying Shirley.

In: Nature Communications, Vol. 9, 5100, 30.11.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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