Radially aligned hierarchical columnar structure as a cathode material for high energy density sodium-ion batteries

Jang Yeon Hwang, Seung Min Oh, Seung Taek Myung, Kyung Yoon Chung, Ilias Belharouak, Yang Kook Sun

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Abstract

Delivery of high capacity with good retention is a challenge in developing cathodes for rechargeable sodium-ion batteries. Here we present a radially aligned hierarchical columnar structure in spherical particles with varied chemical composition from the inner end (Na[Ni<inf>0.75</inf>Co<inf>0.02</inf>Mn<inf>0.23</inf>]O<inf>2</inf>) to the outer end (Na[Ni<inf>0.58</inf>Co<inf>0.06</inf>Mn<inf>0.36</inf>]O<inf>2</inf>) of the structure. With this cathode material, we show that an electrochemical reaction based on Ni<sup>2+/3+/4+</sup> is readily available to deliver a discharge capacity of 157 mAh (g-oxide)<sup>-1</sup> (15mAg<sup>-1</sup>), a capacity retention of 80% (125mAhg<sup>-1</sup>) during 300 cycles in combination with a hard carbon anode, and a rate capability of 132.6 mAhg<sup>-1</sup> (1,500mAg<sup>-1</sup>, 10 C-rate). The cathode also exhibits good temperature performance even at -20°C. These results originate from rather unique chemistry of the cathode material, which enables the Ni redox reaction and minimizes the surface area contacting corrosive electrolyte.

Original languageEnglish
Article number7865
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 17 Apr 2015

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

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