Covalent Organic Frameworks as the Coating Layer of
Ceramic Separator for High-Efficiency Lithium–Sulfur Batteries
Jianyi Wang
Liping Si
Qin Wei
Xujia Hong
Songliang Cai
Yuepeng Cai
10.1021/acsanm.7b00057.s001
https://acs.figshare.com/articles/journal_contribution/Covalent_Organic_Frameworks_as_the_Coating_Layer_of_Ceramic_Separator_for_High-Efficiency_Lithium_Sulfur_Batteries/5734911
Covalent organic
frameworks (COFs) have been proven to be an efficient host material
for trapping sulfur in lithium–sulfur batteries. However, the
potential application as the coating layer of the separator has not
been well-addressed yet. Here, we synthesized an imine-based COF,
DMTA-COF, which exhibited an AB-stacking mode and had a pore size
of 0.56 nm. For the first time, we applied this nanoporous COF as
the coating layer of the ceramic separator; the corresponding cell
gave an initial discharge capacity up to 1415 mA h/g, and 1000 mA
h/g remained after 100 cycles at 0.5 C. The performance is much better
than that of the pristine ceramic separator and the super-P coated
ceramic separator, demonstrating that the nanopores in the composite
separator can effectively block the polysulfide across the separator,
thus reducing the “shuttle” effect and the loss of active
materials. This study provides a new design strategy for separators
in lithium–sulfur batteries.
2017-12-12 00:00:00
DMTA-COF
Covalent Organic Frameworks
COF
coating layer
separator