Polymorphic cobalt sulfide-embedded graphene foam with ultralong cycling and ultrafast rate capability for potassium-ion batteries

Potassium-ion batteries (KIBs) attract growing attention due to their low price and abundant resources. However, the main drawback is the large-sized potassium ions, which results in a lack of superior capacity and desirable stable materials. We herein propose the Co9S8/GF nanocomposite synthesized...

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Bibliographic Details
Main Authors: Ye, Xinli, Zhang, Junxiong, Ma, Xiaomin, Shen, Zexiang
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
Subjects:
Online Access:https://hdl.handle.net/10356/170261
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Institution: Nanyang Technological University
Language: English
Description
Summary:Potassium-ion batteries (KIBs) attract growing attention due to their low price and abundant resources. However, the main drawback is the large-sized potassium ions, which results in a lack of superior capacity and desirable stable materials. We herein propose the Co9S8/GF nanocomposite synthesized by a solvothermal route followed by heat treatment under the reduction atmosphere with the CoS/GF nanocomposite as the control group. The as-synthesized Co9S8 has a typical morphology of vertically arranged uniform nanosheet arrays. The Co9S8/GF nanocomposite electrode delivers a capacity of 345.65 mAh·g-1 after 600 cycles at 500 mA·g-1 and even 343.06 mAh·g-1 after 1360 cycles at 5000 mA·g-1 in KIBs. Besides, the discharge capacity can reach 461.05 mAh·g-1 after the current increases to 5000 mA·g-1 and a reversible capacity of 578.40 mAh·g-1 when the current density recovers to 250 mA·g-1 again. At last, the charge storage behaviors are mainly discussed, and the unique structure can suffer the volumetric change, especially at high current density, which opens up a novel and effective way to build the embedded porous structure for the next-generation KIB technology.