High-Lithium-Affinity Chemically Exfoliated 2D Covalent Organic Frameworks

被引：312

作者：

Chen, Xiudong ^{[1
]}

Li, Yusen ^{[2
,3
]}

Wang, Liang ^{[1
,4
]}

Xu, Yi ^{[1
]}

Nie, Anmin ^{[5
]}

Li, Qianqion ^{[5
]}

Wu, Fan ^{[1
]}

Sun, Weiwei ^{[1
]}

Zhang, Xiang ^{[4
]}

Vajtai, Robert ^{[4
,6
]}

Ajayan, Pulickel M. ^{[4
]}

Chen, Long ^{[2
,3
]}

Wang, Yong ^{[1
]}

机构：

[1] Shanghai Univ, Sch Environm & Chem Engn, Dept Chem Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China

[2] Tianjin Univ, Tianjin Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China

[3] Tianjin Univ, Dept Chem, Tianjin 300072, Peoples R China

[4] Rice Univ, Dept Mat Sci & NanoEngn, 6100 Main St, Houston, TX 77005 USA

[5] Shanghai Univ, Mat Genome Inst, Shanghai 200444, Peoples R China

[6] Univ Szeged, Dept Appl & Environm Chem, Interdisciplinary Excellence Ctr, Rerrich Bela Ter 1, H-6720 Szeged, Hungary

来源：

ADVANCED MATERIALS | 2019年 / 31卷 / 29期

基金：

中国国家自然科学基金;

关键词：

chemical exfoliation; covalent organic frameworks; lithium-organic batteries; organic nanosheets; ANODE MATERIALS; HIGH-CAPACITY; ION; PERFORMANCE; STORAGE; CATHODES; NANORODS; CARBON; NANOSHEETS; COMPOSITE;

D O I：

10.1002/adma.201901640

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Covalent organic frameworks (COFs) with reversible redox behaviors are potential electrode materials for lithium-ion batteries (LIBs). However, the sluggish lithium diffusion kinetics, poor electronic conductivity, low reversible capacities, and poor rate performance for most reported COF materials limit their further application. Herein, a new 2D COF (TFPB-COF) with six unsaturated benzene rings per repeating unit and ordered mesoporous pores (approximate to 2.1 nm) is designed. A chemical stripping strategy is developed to obtain exfoliated few-layered COF nanosheets (E-TFPB-COF), whose restacking is prevented by the in situ formed MnO2 nanoparticles. Compared with the bulk TFPB-COF, the exfoliated TFPB-COF exhibits new active Li-storage sites associated with conjugated aromatic pi electrons by facilitating faster ion/electron kinetics. The E-TFPB-COF/MnO2 and E-TFPB-COF electrodes exhibit large reversible capacities of 1359 and 968 mAh g(-1) after 300 cycles with good high-rate capability.

引用

页数：8

共 52 条

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