Fabrication of metal-organic framework-based nanofibrous separator via one-pot electrospinning strategy
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Fabrication of metal-organic framework-based nanofibrous separator via one-pot electrospinning strategy Congcong Chen1,§, Weidong Zhang2,§, He Zhu1,3 (), Bo-Geng Li1, Yingying Lu2, and Shiping Zhu3,4 () 1
State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China 3 School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen 518172, China 4 Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada § Congcong Chen and Weidong Zhang contributed equally to this work. 2
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 10 August 2020 / Revised: 24 September 2020 / Accepted: 19 October 2020
ABSTRACT Metal-organic framework (MOF)/polymer composites have attracted extensive attention in the recent years. However, it still remains challenging to efficiently and effectively fabricate these composite materials. In this study, we propose a facile one-pot electrospinning strategy for preparation of HKUST-1/polyacrylonitrile (PAN) nanofibrous membranes from a homogeneous stock solution containing HKUST-1 precursors and PAN. MOF crystallization and polymer solidification occur simultaneously during the electrospinning process, thus avoiding the issues of aggregation and troublesome multistep fabrication of the conventional approach. The obtained HKUST-1/PAN electrospun membranes show uniform MOF distribution throughout the nanofibers and yield good mechanical properties. The membranes are used as separators in Li-metal full batteries under harsh testing conditions, using an ultrathin Li-metal anode, a high mass loading cathode, and the HKUST-1/PAN nanofibrous separator. The results demonstrate significantly improved cycling performance (capacity retention of 83.1% after 200 cycles) under a low negative to positive capacity ratio (N/P ratio of 1.86). The improvement can be attributed to an enhanced wettability of the separator towards electrolyte stemmed from the nanofibrous structure, and a uniform lithium ion flux stabilized by the open metal sites of uniformly distributed HKUST-1 particles in the membrane during cycling.
KEYWORDS one-pot electrospinning strategy, metal-organic framework, composite nanofibrous membrane, battery separator
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Introduction
Metal-organic frameworks (MOFs), a class of crystalline porous materials consisting of metal centers connected by organic ligands, have drawn much attention in a wide range of fields including energy storage [1], catalysis [2], adsorption [3, 4], drug delivery [5], etc. However, a majority of the MOF family is not soluble or meltable. It is thus difficult to process the materials, which impedes exploitation for their industrial applications [6]. In this regard, combining MOFs with readily processable polymers is considered as an effective way to shape them i
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