Amorphous CoS1.4 ultrathin nanosheets/amorphous N-doped carbon nanobox : A dual-amorphous confined structure for superior potassium storage

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

View graph of relations

Author(s)

  • Qiyao Yu
  • Bo Wang
  • Jun Hu
  • Guoquan Suo
  • Qingxin Wang
  • Haozheng Mei
  • Kai Xi
  • Wei (Alex) Wang
  • Jianguo Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number230117
Journal / PublicationJournal of Power Sources
Volume506
Online published6 Jun 2021
Publication statusPublished - 15 Sep 2021

Abstract

Potassium-ions batteries (KIBs) are regarded as an alternative to lithium-ion batteries (LIBs) owing to their affordable cost, abundance and high working voltage. Transition metal sulfides (TMSs) are considered to be attractive anode materials for KIBs, but the practical development is hampered by their inferior conductivity and large volume expansion upon potassiation/depotassiation process. Herein, we report a dual-amorphous confined structure composing of amorphous CoS1.4 ultrathin nanosheets confined in amorphous N-doped carbon nanobox (a-CoS NS/NCB) as an anode material for KIBs. The isotropic nature of amorphous CoS1.4 ultrathin nanosheets (about four atomic layers in thickness) can effectively accommodate volume strain as well as decrease the resistance of the carrier to phase transition due to their high level of disorder. Besides, the amorphous N-doped carbon nanobox has the advantages of enhancing electronic conductivity, avoiding the direct contact of active material and electrolyte and restraining the excessive growth of solid electrolyte interphase film. As a result, the a-CoS NS/NCB anode delivers a capacity of 235.3 mAh g−1 at 100 mA g−1 after 800 cycles. While the results prove the new anode is a promising candidate for KIBs, it also opens the door for broader application of amorphous composite in metal-ions batteries.

Research Area(s)

  • CoS1.4 ultrathin nanosheets, Dual-amorphous, Enhanced electronic conductivity, High stability, Potassium ion batteries

Citation Format(s)

Amorphous CoS1.4 ultrathin nanosheets/amorphous N-doped carbon nanobox : A dual-amorphous confined structure for superior potassium storage. / Yu, Qiyao; Wang, Bo; Hu, Jun; Suo, Guoquan; Wang, Qingxin; Mei, Haozheng; Xi, Kai; Lu, Shiyao; Wang, Wei (Alex); Zhang, Jianguo.

In: Journal of Power Sources, Vol. 506, 230117, 15.09.2021.

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