Radially aligned hierarchical columnar structure as a cathode material for high energy density sodium-ion batteries
- Authors
- Hwang, Jang-Yeon; Oh, Seung-Min; Myung, Seung-Taek; Chung, Kyung Yoon; Belharouak, Ilias; Sun, Yang Kook
- Issue Date
- Apr-2015
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/25004
- DOI
- 10.1038/ncomms7865
- ISSN
- 2041-1723
- 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[Ni0.75Co0.02Mn0.23]O-2) to the outer end (Na[Ni0.58Co0.06Mn0.36]O-2) of the structure. With this cathode material, we show that an electrochemical reaction based on Ni2+/3+/4+ is readily available to deliver a discharge capacity of 157 mAh (g-oxide)(-1) (15 mA g(-1)), a capacity retention of 80% (125 mAh g(-1)) during 300 cycles in combination with a hard carbon anode, and a rate capability of 132.6 mAh g(-1) (1,500 mA g(-1), 10 degrees C-rate). The cathode also exhibits good temperature performance even at -20 degrees 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.
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