A flexible solid-state electrolyte based on comb-like PEG-functionalized covalent organic frameworks for lithium metal batteries

Abstract

Solid-state batteries have great potential for increased safety and energy density, but most solid-state electrolytes show relatively low ionic conductivity and can’t fully meet the requirements of solid-state batteries. Herein,...

Recent Progress in Using Covalent Organic Frameworks to Stabilize Metal Anodes for Highly‐Efficient Rechargeable Batteries

“…Tan et al incorporated poly(ethylene glycol) methyl ether methacrylate (PEGMA) in the ethylene-based COF (Bt-COF) channels and successfully prepared a homogeneous composite solid polymer electrolyte (Bt-COF x% -SPE) (Figure 9d). [69] When 2 % content of Bt-COF was used, the crystallinity of PEGMA was decreased and the surface of the formed electrolyte membrane was smooth and dense (Figure 9e). Moreover, the Bt-COF-contained electrolytes exhibited a high ionic conductivity of 5.3×10 À 5 S cm À 1 (vs. 1.2×10 À 6 S cm À 1 for Bt-COF-free electrolytes; Table 4) and a satisfying t Li + (0.47) at room temperature (Figure 9f, g).…”

“…h) Cycling performance of LFP j j Bt-COF 2% -SPE j j Li cell. [69] Copyright 2024, Royal Society of Chemistry. lyte (HGPE) is conducive to the performance and safety of batteries (Figure 10a).…”

“…Inset in (g): electrochemical impedance spectroscopy before and after polarization. h) Cycling performance of LFP j j Bt-COF 2% -SPE j j Li cell [69]. Copyright 2024, Royal Society of Chemistry.…”

Enhancement of covalent triazine frameworks containing S heteroatom for photocatalytic hydrogen evolution: the role of composite PEG

“…Filling polyethylene glycol (PEG) into the pores of covalent organic frameworks (COFs) can improve the stability of COF significantly. 18–22 In 2021, Ting Zhou et al reported that the structure of BT-COF filled with PEG (BT-COF@PEG) was more stable, and its hydrogen evolution rate was 1.44 times that of BT-COF without PEG, indicating that the addition of PEG could also increase the photocatalytic hydrogen evolution rate. 20 As an important member of the COF family, CTFs may show high crystallinity and stability by PEG, so the optimal composite ratio should be explored in order to achieve higher photocatalytic hydrogen evolution performance.…”