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Ionic Covalent Organic Framework Membranes with Single Li-Ion Conduction
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DOI：10.1021/acs.chemmater.5c01420.png)
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Abstract
En 中文
Two-dimensional covalent organic frameworks (2D-COFs) are chemically and thermally stable, and their ionic COFs have recently been reported as solid electrolytes that exhibit lithium-ion (Li-ion) conductivity due to their well-ordered one-dimensional ion channels. However, there are very few examples of high Li-ion conductivity (sigma(r.t.) > 10(-5) S cm(-1)) achieved with pure 2D-COF, not combined with other materials (e.g., solvents, other electrolytes, and electrolyte salts). One concern is that composites with other materials may cause undesirable side reactions. In addition, Li-ions may conduct through other materials, leading to incorrect Li conductivity measurements of the 2D-COFs. This study developed a synthesis process for ionic COF (TpBD-(SO3Li)(2)) membranes, which are Li salts of a beta-ketoenamine-type COF with a high density of sulfonic acid groups fixed in the framework. After the Li-ion exchange reaction, the system was rinsed with LiOH solution and washed with cold water to obtain TpBD-(SO3Li)(2) in a stable fashion. The resulting TpBD-(SO3Li)(2) membrane achieved a high Li-ion conductivity of 4.0 x 10(-5) S cm(-1) at 30 degrees C as well as a high (similar to 1) transference number. A Li-ion transference number near 1 signifies both the suitability of the membrane as a substitute for inorganic solid electrolytes and a clear distinction from polymer-based organic solid electrolytes. Therefore, this study provides guidelines for designing solvent-free and additive-free single Li-ion conductors based solely on COF materials.
Keywords:
DENDRITE-FREE
ELECTROLYTE
Journal
IF:
7
Papers:
2.8W
Citations:
11.4W