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Liang et al. Energy Mater 2023;3:300006 https://dx.doi.org/10.20517/energymater.2022.63 Page 11 of 14

Figure 8. EIS spectra of Li-S batteries containing the different separators (A) before and (B) after cycling, with enlargement in the inset;
(C) long cycle life tests of Li-S batteries based on CZGNF separator under 2 C.

Figure 9. CV curves of Li-S batteries with different separators: (A) PP separator; (B) GNF separator; (C) CZGNF separator.

and accelerates the oxidation reaction kinetics [Figure 8A]. The battery impedance decreases slightly after
cycling due to the gradual penetration of the electrolyte into the electrode and the re-diffusion of sulfur on
the electrode surface [Figure 8B]. The Li-S battery with CZGNF separator yielded a capacity retention rate
of 72.9% after 400 cycles at 2 C [Figure 8C]. The excellent performance of Li-S batteries with CZGNF
separators is owing to the gelatin matrix of the separator with its high ion migration number and the fast
transport of lithium ions, as well as the strong capture and catalysis of lithium polysulfides by ZIF-67
particles and C , improving the redox kinetics of the bulk sulfur.
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