It has been a long-standing challenge to design and fabricate high
Li+ conductive polymer electrolytes at the atomic level
with superior thermal stability for solid-state lithium-ion batteries.
Covalent organic frameworks (COFs) with tailor-made 1D nanochannels
provide a potential pathway for fast ion transport, but it remains
elusive. In this work, three crystalline thiophene-based imine-linked
COFs were constructed and explored as Li+-conducting composite
electrolytes by doping ionic liquids into their 1D nanochannels. The
COF–IL composite electrolytes exhibited excellent thermal stability
(up to 400 °C) and high Li+ conductivity (up to 2.60
× 10–3 S/cm at 120 °C, one of the highest
values of doped porous organic materials). Furthermore, the COF–IL
composite electrolytes exhibited stable cycling in a LiFePO4–Li full cell with a high initial discharge specific capacity
of 140.8 mA·h/g at 100 °C, more stable than common poly(ethylene
oxide)-based electrolytes, indicating great potential application
under a high-temperature operation. This work opens a new avenue for
the development of fast Li+-conducting COF-based electrolytes
for high-temperature solid-state lithium-ion batteries.
Proton conducting materials are key components for constructing high-energy-density electronic devices. In this work, by accumulation of NH4Br into the nanospace of classical metal organic framework MIL-101-Cr, the highest proton...
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