In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 48 ( 2021), p. 27408-27414
Abstract:
Zinc (Zn) metal with a high chemical stability and low cost has enabled aqueous zinc ion batteries (ZIBs) to show promise for use in large-scale energy storage. However, the unlimited growth of Zn dendrites is the Achilles' heel of ZIBs due to the nonuniform Zn nucleation and deposition. Herein, two-dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheets are employed for the first time to modify glass fibre (GF) separators for highly-stable dendrite-free zinc anodes, in which the g-C 3 N 4 layers act as a bifunctional Zn ion distributor to physically force the diffusion of Zn 2+ through the pores of the hybrid separators and chemically guide the Zn 2+ ion flux via coordination effects between Zn 2+ and the abundant nitrogen species in the g-C 3 N 4 nanosheets. Furthermore, the g-C 3 N 4 layers can efficiently avoid piercing through the hybrid separators and suppress the self-discharging of the ZIBs. As a result, the g-C 3 N 4 nanosheet-modified GF (g-C 3 N 4 /GF) separators endow the Zn//Zn symmetrical batteries with a long lifespan of 700 h at 2 mA cm −2 and 2 mA h cm −2 , which is superior to the counterpart with g-C 3 N 4 -free separators (64 h). In addition, the Zn//MnO 2 batteries with g-C 3 N 4 /GF separators deliver an enhanced capacity of 280 mA h g −1 at 1C after 400 cycles. Therefore, this work may pave the way to a reliable strategy to design 2D nanosheet-modified separators for high-performance ZIBs.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2702232-8
Permalink