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Dual Active Site of the Azo and Carbonyl-Modified Covalent Organic Framework for High-Performance Li Storage
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-03-05 , DOI: 10.1021/acsenergylett.0c00069 Genfu Zhao 1 , Yuhao Zhang 1 , Zhihui Gao 1 , Huani Li 1 , Shuming Liu 1 , Sheng Cai 1 , Xiaofei Yang 2 , Hong Guo 1 , Xueliang Sun 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-03-05 , DOI: 10.1021/acsenergylett.0c00069 Genfu Zhao 1 , Yuhao Zhang 1 , Zhihui Gao 1 , Huani Li 1 , Shuming Liu 1 , Sheng Cai 1 , Xiaofei Yang 2 , Hong Guo 1 , Xueliang Sun 2
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Organic electrode materials play a crucial role in environmentally friendly and sustainable lithium-ion batteries (LIBs) due to their abundance, high theoretical capacity, inexpensiveness, and recyclability. However, critical issues such as fewer redox-active sites and poor structural stability limit their extensive application in LIBs. Herein, a unique covalent organic framework (Tp-Azo-COF) with a dual active site of N═N and C═O is designed and successfully applied as the anode material for LIBs. Benefiting from its abundance of active sites, large conjugate structure, large surface area, and accessible Li+ transport channels, the Tp-Azo-COF anode materials present high electrochemical kinetics and structural stability. The assembled LIBs deliver a specific capability of 305.97 mAh g–1 at a current density of 1000 mA g–1 after 3000 cycles. This work may inspire avenues for the development of advanced organic materials of inexpensive, sustainable, and durable rechargeable batteries.
中文翻译：
偶氮和羰基修饰的共价有机骨架的双重活性位，用于高性能锂存储
由于有机电极材料的丰度，高理论容量，廉价和可回收性，它们在环保和可持续的锂离子电池（LIB）中起着至关重要的作用。但是，诸如氧化还原活性位点较少和结构稳定性差等关键问题限制了它们在LIB中的广泛应用。本文中，设计了具有N = N和C = O双活性位的独特共价有机骨架（Tp-Azo-COF），并成功地将其用作LIB的阳极材料。Tp-偶氮-COF阳极材料得益于其丰富的活性位点，较大的共轭结构，较大的表面积以及可利用的Li +传输通道，具有较高的电化学动力学和结构稳定性。组装好的LIB提供305.97 mAh g –1的特定功能3000次循环后，电流密度为1000 mA g –1。这项工作可能会为开发廉价，可持续和耐用的可充电电池的高级有机材料开辟道路。
更新日期：2020-04-23
中文翻译：
偶氮和羰基修饰的共价有机骨架的双重活性位，用于高性能锂存储
由于有机电极材料的丰度，高理论容量，廉价和可回收性，它们在环保和可持续的锂离子电池（LIB）中起着至关重要的作用。但是，诸如氧化还原活性位点较少和结构稳定性差等关键问题限制了它们在LIB中的广泛应用。本文中，设计了具有N = N和C = O双活性位的独特共价有机骨架（Tp-Azo-COF），并成功地将其用作LIB的阳极材料。Tp-偶氮-COF阳极材料得益于其丰富的活性位点，较大的共轭结构，较大的表面积以及可利用的Li +传输通道，具有较高的电化学动力学和结构稳定性。组装好的LIB提供305.97 mAh g –1的特定功能3000次循环后，电流密度为1000 mA g –1。这项工作可能会为开发廉价，可持续和耐用的可充电电池的高级有机材料开辟道路。
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