4.8 Article

An Open-Ended Ni3S2-Co9S8 Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium-Ion Batteries

Journal

ADVANCED MATERIALS
Volume 34, Issue 18, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202201420

Keywords

chemical etching; nanocage structures; Ni; S-3; (2)-Co; S-9; (8) heterostructures; potassium-ion batteries

Funding

  1. National Natural Science Foundation of China [51925207, 52161145101, U1910210, 52102322, 51872277, 52002083]
  2. National Synchrotron Radiation Laboratory [KY2060000173]
  3. Joint Fund of the Yulin University
  4. Dalian National Laboratory for Clean Energy [YLU-DNL Fund 2021002]
  5. National Postdoctoral Program for Innovative Talents [BX20200318]
  6. China Postdoctoral Science Foundation [2020M682031]
  7. Fundamental Research Funds for the Central Universities [WK2400000004]

Ask authors/readers for more resources

The Ni-Co-S@rGO nanocages were designed as anode materials for potassium-ion batteries, exhibiting excellent performance in reducing K+ diffusion length, improving reaction kinetics, and achieving high reversible capacity and low capacity degradation. Finite-element-simulation in situ characterizations revealed the unique structural advantages and electrochemical reaction mechanisms of Ni-Co-S@rGO, providing important guidance for designing high-performance energy-storage materials.
Sulfides are perceived as promising anode materials for potassium-ion batteries (PIBs) due to their high theoretical specific capacity and structural diversity. Nonetheless, the poor structural stability and sluggish kinetics of sulfides lead to unsatisfactory electrochemical performance. Herein, Ni3S2-Co9S8 heterostructures with an open-ended nanocage structure wrapped by reduced graphene oxide (Ni-Co-S@rGO cages) are well designed as the anode for PIBs via a selective etching and one-step sulfuration approach. The hollow Ni-Co-S@rGO nanocages, with large surface area, abundant heterointerfaces, and unique open-ended nanocage structure, can reduce the K+ diffusion length and promote reaction kinetics. When used as the anode for PIBs, the Ni-Co-S@rGO exhibits high reversible capacity and low capacity degradation (0.0089% per cycle over 2000 cycles at 10 A g(-1)). A potassium-ion full battery with a Ni-Co-S@rGO anode and Prussian blue cathode can display a superior reversible capacity of 400 mAh g(-1) after 300 cycles at 2 A g(-1). The unique structural advantages and electrochemical reaction mechanisms of the Ni-Co-S@rGO are revealed by finite-element-simulation in situ characterizations. The universal synthesis technology of bimetallic sulfide anodes for advanced PIBs may provide vital guidance to design high-performance energy-storage materials.

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