Donor–Acceptor Conjugated Microporous Polymer toward Enhanced Redox Kinetics in Lithium–Sulfur Batteries

Abstract

Conjugated microporous polymers (CMPs) with porous structure and rich polar units are favorable for high-performance lithium−sulfur (Li−S) batteries. However, understanding the role of building blocks in polysulfide catalytic conversion is still limited. In this work, two triazine-based CMPs are constructed by electron-accepting triazine with electron-donating triphenylbenzene (CMP-B) or electron-accepting triphenyltriazine (CMP-T), which can grow on a conductive carbon nanotube (CNT) to serve as separator modifiers for Li−S batteries.

Metal-free corrole-based donor–acceptor porous organic polymers as efficient bifunctional catalysts for hydrogen evolution and oxygen reduction reactions

“…Cor-BTDA-D–A-POP and Cor-TDA-D–A-POP model systems possess a HOMO–LUMO energy gap of 1.90 and 1.94 eV, respectively. The subtle difference in the HOMO–LUMO gap suggests the relatively stronger charge transfer ability provided by the Cor-BTDA-D–A-POP model system, 48,54 which is further confirmed by Nyquist curves and electrical resistivities.…”

Multi-heterostructured MXene/NiS2/Co3S4 with S-Vacancies to Promote Polysulfide Conversion in Lithium–Sulfur Batteries

“…In addition, based on the I – t curves in Figure e), the Li + transference number ( t Li + ) values of MXene/NiS 2 , MXene/Co 3 S 4 , and MXene/NiS 2 /Co 3 S 4 are determined to be 0.64, 0.62, and 0.74, respectively. MXene/NiS 2 /Co 3 S 4 has the highest σ and t Li + because its excellent pore structure and electrolyte wettability are more conducive to Li + transference. , …”

“…MXene/NiS 2 /Co 3 S 4 has the highest σ and t Li + because its excellent pore structure and electrolyte wettability are more conducive to Li + transference. 29,30 To evaluate the electrocatalytic activity of different catalysts, we assembled and tested symmetrical cells. Figure 7a shows the CV curves at a scan rate of 2 mV s −1 , where the current density and peak area of MXene/NiS 2 /Co 3 S 4 increase significantly, while peak separation decreases relative to MXene/NiS 2 and MXene/Co 3 S 4 , indicating that the S-vacancy rich multi-heterostructure effectively accelerates the transformation of LiPSs and significantly improves the redox reaction kinetics.…”