4.8 Article

Realizing Fast Diffusion Kinetics Based on Three-Dimensional Ordered Macroporous Cu9S5@C for Potassium-Ion Batteries

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 31, Pages 36982-36991

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c05563

Keywords

3D ordered macroporous structure; ion diffusion; copper sulfide; potassium-ion batteries; metal-organic frameworks

Funding

  1. National Natural Science Foundation of Guangdong Province [2021A1515012362]
  2. R&D Projects in Key Areas of Guangdong Province [2019B090908001]
  3. Natural Science Foundation of China [51621001]

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Through a sulfidation and ion exchange strategy, a copper sulfide embedded in a three-dimensional ordered macroporous carbon framework was prepared as an advanced anode material for high-performance potassium-ion batteries. The unique structure provides rapid transport channels and enhances the ionic diffusion kinetics of batteries.
Recently, potassium-ion batteries (PIBs) have been deemed to be a potential next-generation energy storage system for large-scale application because of the similar metal-ion storage mechanism as lithium-ion batteries and rich potassium resources. However, the large-sized potassium ion will cause sluggish reaction kinetics of K+ during charge/discharge processes, hindering the development of high-performance PIBs. In this work, copper sulfide embedded in three-dimensional ordered macroporous carbon framework (3DOM Cu9S5@C) was prepared through a sulfidation and subsequent ion exchange strategy with 3D ordered macropore Zn-based metal-organic frameworks as a precursor for an advanced PIBs anode. In particular, the interconnected 3D ordered macroporous structure can provide rapid transport channels for the large potassium ions and create a sufficient contact area for solid electrode materials and the liquid electrolyte, which is conducive to improve the ionic diffusion kinetics of batteries. Consequently, when the prepared 3DOM Cu9S5@C composite was used as a PIBs anode material, it shows a remarkable potassium storage rate capacity of 170 mA h g(-1) at 2.0 A g(-1) and an excellent cycling stability of 316 mA h g(-1) at 100 mA g(-1) after 200 cycles.

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