铜配位金属共价有机框架作为锂离子电池负极材料的出色储锂性能

IF 13 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Derong Luo, Huizi Zhao, Feng Liu, Hai Xu, Xiaoyu Dong, Bing Ding, Hui Dou, Xiaogang Zhang
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引用次数: 0

摘要

金属-共价有机框架(MCOF)作为共价有机框架(COF)和金属有机框架(MOF)之间的桥梁,具有金属位点开放、结构稳定、结晶性好、可调性强以及孔隙率高等特点,但目前仍处于起步阶段。在这项工作中,通过简单的后修饰方法,将 3,3′-二羟基联苯二胺(DHBD)和三三甲基氯葡萄糖醇(TFP)缩合合成的具有酮烯胺结构的共价有机框架 DT-COF 与 Cu2+ 配位,得到了 Cu-DT COF 铜配位金属共价有机框架。由于 Cu2+ 的配位作用,DT-COF 的酮烯胺结构异构化为 Cu-DT COF 的烯醇亚胺结构。Cu-DT COF 结构的变化引起了 Cu-DT COF 中电子分布的变化,从而极大地促进了 COF 骨架的活化和深度储锂行为。作为锂离子电池(LIBs)的负极材料,Cu-DT COF 的电化学性能大大提高,在电流密度为 0.5 A g-1 的条件下,循环 200 次后比容量仍为 760 mAh g-1,循环 500 次后比容量仍为 505 mAh g-1。初步的储锂机理研究表明,Cu2+ 也参与了储锂过程。根据 FT-IR、XPS、EPR 表征和电化学分析,提出了 Cu-DT COF 的可能机理。这项工作为提高 COF 的储能性能提供了一种新的策略,并促进了 COF 和 MCOF 在锂离子电池中的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Outstanding Lithium Storage Performance of a Copper-Coordinated Metal-Covalent Organic Framework as Anode Material for Lithium-Ion Batteries

Outstanding Lithium Storage Performance of a Copper-Coordinated Metal-Covalent Organic Framework as Anode Material for Lithium-Ion Batteries

Outstanding Lithium Storage Performance of a Copper-Coordinated Metal-Covalent Organic Framework as Anode Material for Lithium-Ion Batteries

Metal-covalent organic frameworks (MCOF) as a bridge between covalent organic framework (COF) and metal organic framework (MOF) possess the characteristics of open metal sites, structure stability, crystallinity, tunability as well as porosity, but still in its infancy. In this work, a covalent organic framework DT-COF with a keto-enamine structure synthesized from the condensation of 3,3′-dihydroxybiphenyl diamine (DHBD) and triformylphloroglucinol (TFP) was coordinated with Cu2+ by a simple post-modification method to a obtain a copper-coordinated metal-covalent organic framework of Cu-DT COF. The isomerization from a keto-enamine structure of DT-COF to a enol-imine structure of Cu-DT COF is induced due to the coordination interaction of Cu2+. The structure change of Cu-DT COF induces the change of the electron distribution in the Cu-DT COF, which greatly promotes the activation and deep Li-storage behavior of the COF skeleton. As anode material for lithium-ion batteries (LIBs), Cu-DT COF exhibits greatly improved electrochemical performance, retaining the specific capacities of 760 mAh g−1 after 200 cycles and 505 mAh g−1 after 500 cycles at a current density of 0.5 A g−1. The preliminary lithium storage mechanism studies indicate that Cu2+ is also involved in the lithium storage process. A possible mechanism for Cu-DT COF was proposed on the basis of FT-IR, XPS, EPR characterization and electrochemical analysis. This work enlightens a novel strategy to improve the energy storage performance of COF and promotes the application of COF and MCOF in LIBs.

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来源期刊
Energy & Environmental Materials
Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
17.60
自引率
6.00%
发文量
66
期刊介绍: Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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