Enhanced potassium-ion storage performance of bimetallic-sulfide based on regulatory reaction mechanism

Shengyang Li, Hao Chen, Qiusheng Zhang, Hongli Deng, Song Chen, Xiaohua Shen, Yizhi Yuan, Yifang Ding, Yingliang Cheng, Hongtao Sun, Jian Zhu, Bingan Lu

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Developing advanced materials for reversibly accommodating K+ and understanding their electrochemical mechanism is essential for K+ storage. Herein, we report a bimetallic-sulfide with a hollow nanopyramid structure wrapped by reduced graphene oxide as an anode (NiCo1.15S4@rGO) for potassium ion batteries (PIBs). It is revealed that the NiCo1.15S4@rGO with octahedral sites can ensure reversible intercalation/deintercalation of K+. The irreversible phase transformation produces “death substances” during the potassium storage, leading to severe capacity degradation. In the regulated voltage window of 0.25–2.5 V, the NiCo1.15S4@rGO exhibited an intercalation/deintercalation reaction mechanism without irreversible phase transformation, which delivered a high reversible capacity of 436 mAh g−1 at 0.5 A g−1 and excellent rate properties (315 mAh g−1 at 1.5 A g−1). The corresponding reaction mechanisms and morphological evolution were further revealed by in-situ powder X-ray diffraction (XRD), in-situ electrochemical impedance spectroscopy (EIS), and ex-situ characterizations. An in-depth understanding of bimetallic sulfide anodes for advanced PIBs may provide decisive guidance for the design of high-performance anodes.

Original languageEnglish (US)
Article number143342
JournalChemical Engineering Journal
Volume466
DOIs
StatePublished - Jun 15 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

Keywords

  • Bimetallic-sulfide
  • Intercalation/deintercalation mechanism
  • Potassium-ion batteries
  • Reversible capacity
  • Voltage engineering

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