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首页> 外文期刊>Advanced energy materials >High and Reversible Lithium Ion Storage in Self- Exfoliated Triazole-Triformyl Phloroglucinol-Based Covalent Organic Nanosheets
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High and Reversible Lithium Ion Storage in Self- Exfoliated Triazole-Triformyl Phloroglucinol-Based Covalent Organic Nanosheets

机译：自剥落的三唑-三甲酰基间苯三酚基共价有机纳米片中的高可逆锂离子存储量

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摘要

Covalent organic framework (COF) can grow into self-exfoliated nanosheets. Their graphene/graphite resembling microtexture and nanostructure suits electrochemical applications. Here, covalent organic nanosheets (CON) with nanopores lined with triazole and phloroglucinol units, neither of which binds lithium strongly, and its potential as an anode in Li-ion battery are presented. Their fibrous texture enables facile amalgamation as a coin-cell anode, which exhibits exceptionally high specific capacity of approximate to 720 mA h g(-1) (@100 mA g(-1)). Its capacity is retained even after 1000 cycles. Increasing the current density from 100 mA g(-1) to 1 A g(-1) causes the specific capacity to drop only by 20%, which is the lowest among all high-performing anodic COFs. The majority of the lithium insertion follows an ultrafast diffusion-controlled intercalation (diffusion coefficient, D-Li(+) = 5.48 x 10(-11) cm(2) s(-1)). The absence of strong Li-framework bonds in the density functional theory (DFT) optimized structure supports this reversible intercalation. The discrete monomer of the CON shows a specific capacity of only 140 mA h g(-1) @50 mA g(-1) and no sign of lithium intercalation reveals the crucial role played by the polymeric structure of the CON in this intercalation-assisted conductivity. The potentials mapped using DFT suggest a substantial electronic driving-force for the lithium intercalation. The findings underscore the potential of the designer CON as anode material for Li-ion batteries.
机译：共价有机骨架（COF）可以成长为自剥落的纳米片。它们的石墨烯/石墨类似于微结构和纳米结构，适合电化学应用。在此，提出了具有衬有三唑和间苯三酚单元的纳米孔的共价有机纳米片（CON），它们均不能牢固地结合锂，并且它具有作为锂离子电池阳极的潜力。它们的纤维质构使得纽扣电池阳极可以轻松地合并，它表现出非常高的比容量，大约为720 mA h g（-1）（@ 100 mA g（-1））。即使经过1000次循环，它的容量也会保留。将电流密度从100 mA g（-1）增加到1 A g（-1）会使比容量仅下降20％，这是所有高性能阳极COF中最低的。锂的插入大部分遵循超快扩散控制插层（扩散系数，D-Li（+）= 5.48 x 10（-11）cm（2）s（-1））。密度泛函理论（DFT）优化的结构中不存在强力的Li骨架键，支持了这种可逆插值。 CON的离散单体仅显示140 mA hg（-1）@ 50 mA g（-1）的比容量，并且没有锂嵌入的迹象显示CON的聚合物结构在这种嵌入辅助下所起的关键作用电导率。使用DFT测绘的电位表明，锂嵌入的电子驱动力很大。这些发现强调了设计师CON作为锂离子电池负极材料的潜力。

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