Boosting the Alkali Metal Ions Storage Performance of Layered Nb2C with a Molecular Welding Strategy

作     者：Liu, Maocheng Zhang, Dongting Liu, Bao Tian, Chenyang Zhao, Bei Wang, Yaqin Wang, Yuanyi Hu, Yuxia Kong, Lingbin Luo, Dan Chen, Zhongwei 

作者机构：State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Xiangtan University Hunan Xiangtan411105 China Department of Chemical Engineering Waterloo Institute for Nanotechnology University of Waterloo WaterlooONN2L 3G1 Canada Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University Guangzhou510006 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Anodes 

摘      要：MXenes are promising 2D-layered anode materials for rechargeable batteries. However, MXenes suffer from severe volume expansion and sluggish ion diffusion kinetics during ions insertion/extraction, leading to inferior battery performance. Herein, we developed a molecular welding strategy to stabilize layered structure and enlarge interlayer spacing of Nb2C through a dehydration condensation reaction between the -COOH groups in 1,3,5-benzenetricarboxylic acid (BTC) molecules and -NH2 groups on the surface of the aminofunctionalized Nb2C, which enable the BTC to chemically weld into interlayers of Nb2C (named as Nb2C/BTC). The intercalation of BTC into Nb2C contributes both pillar and strain effects to the 2D-layered Nb2C, rendering its maximum utilization. Such Nb2C/BTC with enlarged interlayer spacing and inhibited volume variation could remarkably promote the rate capability and cycling stability of Nb2C when used as the electrodes of alkali metal ions batteries. A decent Li+/Na+ ions storage capacity-retention of 86.6% (0.1 A g-1)/93.5% (1.0 A g-1) can be presented. A much reduced ion diffusion barrier of 0.88 eV is also delivered in Nb2C/BTC through DFT theoretical calculations. This work provides a new strategy for broadening the interlayer spacing and inhibiting the severe volume variation of MXenes for enhanced alkali metal ions storage. © 2022, The Authors. All rights reserved.