P2-type NaxCu0.15Ni0.20Mn0.65O2 cathodes with high voltage for high-power and long-life sodium-ion batteries

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

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Author(s)

  • Wenpei Kang
  • Zhenyu Zhang
  • Haidong Bian
  • Wenyue Li
  • Tsz-Wai Ng

Detail(s)

Original languageEnglish
Pages (from-to)31661-31668
Journal / PublicationACS Applied Materials and Interfaces
Volume8
Issue number46
Publication statusPublished - 23 Nov 2016

Abstract

Cu-Ni-Mn-based ternary P2-type NaxCu0.15Ni0.20Mn0.65O2 (x = 0.50, 0.67, and 0.75) cathodes for sodium-ion batteries (SIBs) are synthesized by a co-precipitation method. We find that Na content plays a key role on the structure, morphology, and the charge-discharge performances of these materials. For x = 0.67 and 0.75, superstructure from Na+-vacancy ordering is observed, while it is absent in the x = 0.50 sample. Despite the same synthesis conditions, materials with x = 0.67 and 0.75 show smaller particle sizes compared to that of the x = 0.50 sample. In addition, redox potentials of the materials differ significantly even though they have the same transition metal ratios. These differences are attributed to the changes in local structures of the as-prepared materials arising from the different amount of Na and possibly oxygen in the lattice. Materials with x = 0.67 and 0.75 show excellent rate performance and cycle stability when tested as cathode material of SIBs. Average discharge potential is as high as 3.41 V versus Na-Na+ with capacity of 87 mAh g-1 at 20 mA g-1. Excellent capacity and cycle stability are maintained even when they are tested with higher current rates. For instance, a capacity of 62.3 mAh g-1 is obtained from the x = 0.67 sample at 1000 mA g-1 after 1000 cycles between 3.0 and 4.2 V without any decrease in capacity.

Research Area(s)

  • cathode, high power, long life, P2-type, sodium-ion battery

Citation Format(s)

P2-type NaxCu0.15Ni0.20Mn0.65O2 cathodes with high voltage for high-power and long-life sodium-ion batteries. / Kang, Wenpei; Yu, Denis Y. W.; Lee, Pui-Kit; Zhang, Zhenyu; Bian, Haidong; Li, Wenyue; Ng, Tsz-Wai; Zhang, Wenjun; Lee, Chun-Sing.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 46, 23.11.2016, p. 31661-31668.

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