Synthesis of a 2D nitrogen-rich π-conjugated microporous polymer for high performance lithium-ion batteries

Abstract

Here we synthesized a 2D π-conjugated microporous polymer NGA-CMP. Heated sample NGA-CMP400 is used for the first time as an anode for LIBs and shows high capacity lithium-ion storage with excellent cycle performance at high current density.

Exploiting Polythiophenyl‐Triazine‐Based Conjugated Microporous Polymer with Superior Lithium‐Storage Performance

“…Even at an enhanced current rate of 5000 mA g −1 , TzThBT could still show a Li + storage capacity of 326 mAh g −1 after 1500 cycles (Figure b), implying the excellent cyclability for long‐term application. Compared with some other reported organic porous polymer anodes, the TzThBT anode also shows a much higher Li + storage capacity at various current rates, especially at a high current rate of 5000 mA g −1 (Figure c), demonstrating the superior rate performance of the TzThBT electrode.…”

“… Cycling stability and coulombic efficiency of TzThBT at (a) 500 mA g −1 and (b) 5000 mA g −1 . (c) Comparison of Li + storage capability of TzThBT and previously reported porous polymer anodes for LIBs (PDCzBT, PTTE, E‐SNW‐1/CNT, PBIM, PDASA, NGA‐CMP400, IISERP‐CON1).…”

Capturing Visible Light in Low‐Band‐Gap C4N‐Derived Responsive Bifunctional Air Electrodes for Solar Energy Conversion and Storage

“…1612 cm À1 )c orresponding to the stretch vibration of C = Ni np yrazine rings emerged in C 4 N, which implicated the successful transformation of the C = O group to the C = Nl inkage. [12,23] Furthermore,t he 13 Cs olidstate nuclear magnetic resonance (NMR) spectrum of C 4 N presented two distinct NMR peaks:o ne at ca. 130 ppm corresponded to the C=Ccarbon of benzene ring;the other at ca.…”

“…The high-resolution N1ss pectrum of C 4 N/CP can be deconvoluted into ap eak at 400.1 eV corresponding to pyrazine-like N-C signals and ap eak at 398.9 eV derived from residual -NH 2 groups,s imilar to C 4 Np owder (Figure 1d;F igure S4). [23,24] Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation of C 4 N/CP uncovered au niform coating layer consisting of numerous C 4 N particles with the size of several hundreds of nanometers on the carbon fiber surface of CP,i ns tark contrast to rather smooth surface of original CP (Figure 1e-g). Elemental mapping results of individual C 4 Ncoated carbon fiber clearly revealed the homogeneous distribution of Cand Ninthe C 4 N coating layers (Figure 1h).…”

“…1637 cm −1 assignable to C=O groups in HKH disappeared while the new peak (ca. 1612 cm −1 ) corresponding to the stretch vibration of C=N in pyrazine rings emerged in C 4 N, which implicated the successful transformation of the C=O group to the C=N linkage [12, 23] . Furthermore, the 13 C solid‐state nuclear magnetic resonance (NMR) spectrum of C 4 N presented two distinct NMR peaks: one at ca.…”