Issue 27, 2024

Co/Li2S of chemical confinement decorated electrochemically stable Co(OH)F nanoarrays enabling dendrite-free flexible 3D Li anodes

Abstract

Lithium (Li) metal is regarded as a promising anode for high-energy-density Li-ion batteries because of its high theoretical specific capacity and low potential. Unfortunately, the safety issues derived from Li dendrite formation have hindered their commercialization. Thus, fabricating a flexible, three-dimensional (3D) composite Li anode is an effective strategy to suppress Li dendrite growth. Lithiophilic nanoarrays are commonly constructed on a 3D skeleton to increase its surface area and lithiophilicity. However, the lithiophilic nanoarrays are unstable due to the conversion reaction during Li plating/stripping. Therefore, designing composite nanoarrays with an electrochemically stable inner core and a lithiophilic outer shell is conducive to providing a large surface area and promoting uniform Li deposition. Herein, CoS2 shell–Co(OH)F core composite nanowire arrays were prepared on carbon cloth (CoS2–Co(OH)F/CC) to fabricate a flexible 3D composite Li anode (Li@CoS2–Co(OH)F/CC), in which the electrochemically stable Co(OH)F core ensures the stability of the nanoarray and the lithiophilic CoS2 shell facilitates uniform Li adsorption. Moreover, the Co/Li2S configuration derived from the lithiation of CoS2 could promote homogeneous Li deposition, in which the lithiophilic Li2S phase and electron-conductive Co phase jointly facilitate uniform Li nucleation and charge transfer. Consequently, the symmetric cells and full cells paired with a LiFePO4 (LFP) cathode based on the flexible Li@CoS2–Co(OH)F/CC anode presented superior cycling stability.

Graphical abstract: Co/Li2S of chemical confinement decorated electrochemically stable Co(OH)F nanoarrays enabling dendrite-free flexible 3D Li anodes

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2024
Accepted
27 May 2024
First published
01 Jun 2024

J. Mater. Chem. A, 2024,12, 16491-16501

Co/Li2S of chemical confinement decorated electrochemically stable Co(OH)F nanoarrays enabling dendrite-free flexible 3D Li anodes

L. Song, Y. Wang, H. Qian, M. Bai, Q. Chen, M. Xiao, T. Zhao, Z. Xiao, J. Wang and X. Li, J. Mater. Chem. A, 2024, 12, 16491 DOI: 10.1039/D4TA02143F

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