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Covalent-Organic-Framework-Based Li-CO_2 Batteries

机译：基于共价有机框架的Li-CO_2电池

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Covalent organic frameworks (COFs) are an emerging class of porous crystalline materials constructed from designer molecular building blocks that are linked and extended periodically via covalent bonds. Their high stability, open channels, and ease of functionalization suggest that they can function as a useful cathode material in reversible lithium batteries. Here, a COF constructed from hydrazone/hydrazide-containing molecular units, which shows good CO2 sequestration properties, is reported. The COF is hybridized to Ru-nanoparticle-coated carbon nanotubes, and the composite is found to function as highly efficient cathode in a Li-CO2 battery. The robust 1D channels in the COF serve as CO2- and lithium-ion-diffusion channels and improve the kinetics of electrochemical reactions. The COF-based Li-CO2 battery exhibits an ultrahigh capacity of 27 348 mAh g(-1) at a current density of 200 mA g(-1), and a low cut-off overpotential of 1.24 V within a limiting capacity of 1000 mAh g(-1). The rate performance of the battery is improved considerably with the use of the COF at the cathode, where the battery shows a slow decay of discharge voltage from a current density of 0.1 to 4 A g(-1). The COF-based battery runs for 200 cycles when discharged/charged at a high current density of 1 A g(-1).
机译：共价有机骨架（COF）是一类新兴的多孔晶体材料，由设计者分子构件构建而成，这些构件通过共价键定期连接和扩展。它们的高稳定性，开放通道和易于功能化表明它们可以用作可逆锂电池中有用的正极材料。在此，报道了由/酰肼的分子单元构成的COF，其显示出良好的CO 2螯合特性。将COF与覆有Ru-纳米颗粒的碳纳米管杂交，发现该复合材料在Li-CO2电池中起高效阴极的作用。 COF中强大的一维通道可充当CO2和锂离子扩散通道，并改善电化学反应的动力学。基于COF的Li-CO2电池在200 mA g（-1）的电流密度下具有27348 mAh g（-1）的超高容量，在1000的极限容量内具有1.24 V的低截止过电势mAh g（-1）。通过在阴极上使用COF，可大大提高电池的倍率性能，在阴极上，电池的放电电压从0.1到4 A g（-1）的电流密度会缓慢衰减。当以1 A g（-1）的高电流密度放电/充电时，基于COF的电池可运行200个循环。

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