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Bimetallic Organic Framework Derivation of Three-Dimensional and Heterogeneous Metal Selenides/Carbon Composite for High-Performance Lithium-Ion Batteries

Abstract

Heterogeneous structures are attracting increasing attention in energy storage and conversion applications due to the phase boundaries and synergistic effect of multi-components. Herein, bimetal organic framework analogues were introduced to construct a Zn/Co bimetallic selenide heterostructure within 3D-porous N-doped carbon matrix by a NaCl template-assisted lyophilization and annealing process. The cross-linked 3D network can enhance the transport kinetics for both lithium ions and electrons. The stress resulting from the cycling process can be released by the interconnected channels in the composite. The ZnSe and CoSe2 experience electrochemical reactions at different potentials, which can buffer the volume changes mutually to effectively increase the structural stability. Meanwhile, abundant active sites due to the heterostructure enhance pseudocapacitive performance and reaction kinetics, resulting in high specific capacity and good rate performance. As anode materials for lithium-ion batteries, the three-dimensional ZnSe/CoSe2-C composite exhibits superior cycling stability. It retains a high reversible capacity of 700 mA h g-1 after 500 cycles at 1 A g-1.

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Supplementary files

Article information


Submitted
22 Feb 2020
Accepted
13 May 2020
First published
13 May 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Paper

Bimetallic Organic Framework Derivation of Three-Dimensional and Heterogeneous Metal Selenides/Carbon Composite for High-Performance Lithium-Ion Batteries

K. Wang, Y. Wang, Y. Zhang, F. Liu, J. Shi, S. Liu, X. Xie, A. Pan and G. Cao, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR01528H

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