Extremely-Long-Lifespan and Ultrahigh-Rate Li-Ion Batteries Using Conjugated Porous Triazine Polymers

Abstract

As promising electrode materials, porous organic polymers (POPs) have been extensively investigated for rechargeable lithium-ion batteries (LIBs) owing to their significant surface area, tunable redox nature, open channels, and π-conjugated system. Herein, a nitrogen-rich two-dimensional triazine-containing microporous polymer (ACT) is designed and developed as an electrode material of a half-cell for rechargeable lithium-ion storage. The specialized porous and conjugated structure improves the effectiveness of electron transformation and physicochemical stability. Since it has a higher molecular weight, it performs well over exceptionally long cycling performance. According to the results, ACT-based LIBs display stable rate performance and may deliver a specific capacity of 247 mAh g–1 after more than 4000 cycles at 5 A g–1. Additionally, extensive experimental investigation and calculations are used to examine the lithium-ion diffusion mechanism of double active sites in the ACT. This work offers a possible strategy to design excellent organic materials of electrochemical performance for next-generation high-performance LIBs.

Stable Hexaazatrinaphthalene-Based Planar Polymer Cathode Material for Organic Lithium-Ion Batteries

“…The stretching vibrations of CN, CO, and NN groups are apparently weakened from the pristine state to full lithiation. Meanwhile, three new signal-absorbed bonds at 1435, 1330, and 1200 cm –1 appear, assigned as the stretching vibrations of Li–N–N–Li, C–N, and C–O groups. , Subsequently, the delithiation process shows the restoration of NN, CN, and CO groups, presenting a reversible transformation process of these redox-active groups. Overall, the ex situ XPS and ex situ FTIR experimental results of the AZO-HATN-AQ cathode demonstrate that all CN, CO, and NN groups are reversibly involved in the lithiation and delithiation processes.…”

Synthesis of extended π‐conjugated hypercrosslinked polymers via a Friedel–Crafts reaction and an intramolecular Scholl coupling reaction

“…31,32 Moreover, the Li + storage capability of the C-HCP is comparable to that of some conjugated porous polymer anodes, such as the reported N 2 -COF, Cz-COFs1, PTTE, NGA-CCMP400, and so forth (Figure S10). [33][34][35][36][37][38][39][40][41][42] The EIS measurements were used to further understand the influence of C C coupling via the Scholl reaction on the charge storage capability. The better conductivities of C-HCP-ATA and C-HCP-TPB than HCP-ATA and HCP-TPB have been revealed by the fact that they exhibited lower interfacial charge transfer impedance than their precursors (Figure 3C,D).…”

A phthalocyanine-based porous organic polymer for a lithium-ion battery anode

“…9,10 Therefore, it remains a great research hot topic that researchers are still extensively exploring. [11][12][13][14][15] A porous organic polymer (POP) is a kind of porous material that can be used as an electrode, separator, or electrolyte in different batteries including lithium-ion batteries, 16 sodium-ion batteries, 17 potassium-ion batteries, 18 lithiumsulfur batteries, 19 etc. Different from covalent organic frameworks (COFs), POPs are always bound by irreversible covalent bonds constructed by various coupling reactions.…”