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      Preparation of Tough, Binder‐Free, and Self‐Supporting LiFePO 4 Cathode by Using Mono‐Dispersed Ultra‐Long Single‐Walled Carbon Nanotubes for High‐Rate Performance Li‐Ion Battery

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          Abstract

          Low‐contents/absence of non‐electrochemical activity binders, conductive additives, and current collectors are a concern for improving lithium‐ion batteries' fast charging/discharging performance and developing free‐standing electrodes in the aspects of flexible/wearable electronic devices. Herein, a simple yet powerful fabricating method for the massive production of mono‐dispersed ultra‐long single‐walled carbon nanotubes (SWCNTs) in N‐methyl‐2‐pyrrolidone solution, benefiting from the electrostatic dipole interaction and steric hindrance of dispersant molecules, is reported. These SWCNTs form a highly efficient conductive network to firmly fix LiFePO 4 (LFP) particles in the electrode at low contents of 0.5 wt% as conductive additives. The binder‐free LFP/SWCNT cathode delivers a superior rate capacity of 161.5 mAh g −1 at 0.5 C and 130.2 mAh g −1 at 5 C, with a high‐rate capacity retention of 87.4% after 200 cycles at 2 C. The self‐supporting LFP/SWCNT cathode shows excellent mechanical properties, which can withstand at least 7.2 MPa stress and 5% strain, allowing the fabrication of high mass loading electrodes with thicknesses up to 39.1 mg cm −2. Such self‐supporting electrodes display conductivities up to 1197 S m −1 and low charge‐transfer resistance of 40.53 Ω, allowing fast charge delivery and enabling near‐theoretical specific capacities.

          Abstract

          A simple yet powerful fabricating method for the massive production of mono‐dispersed ultra‐long single‐walled carbon nanotubes (SWCNTs) in N‐methyl‐2‐pyrrolidone solution, benefiting from the electrostatic dipole interaction and steric hindrance of dispersant molecules, is reported. These SWCNTs form a highly efficient conductive network to firmly fix LiFePO 4 particles in the electrode at low contents of 0.5 wt% as conductive additives.

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          Author and article information

          Contributors
          yanqingwang@scu.edu.cn
          Journal
          Adv Sci (Weinh)
          Adv Sci (Weinh)
          10.1002/(ISSN)2198-3844
          ADVS
          Advanced Science
          John Wiley and Sons Inc. (Hoboken )
          2198-3844
          11 March 2023
          May 2023
          : 10
          : 13 ( doiID: 10.1002/advs.v10.13 )
          : 2207355
          Affiliations
          [ 1 ] College of Polymer Science and Engineering Sichuan University Chengdu 610065 P. R. China
          [ 2 ] School of Physical Science and Technology Southwest Jiaotong University Chengdu 610031 P. R. China
          [ 3 ] Department of Physics Department of Chemistry Department of Materials Science and Engineering and Center for 2‐Dimensional and Layered Materials The Pennsylvania State University University Park PA 16802 USA
          Author notes
          Author information
          https://orcid.org/0000-0003-3323-0198
          Article
          ADVS5291
          10.1002/advs.202207355
          10161069
          36905241
          ad6eab8f-fae5-4794-9268-303be8af8282
          © 2023 The Authors. Advanced Science published by Wiley‐VCH GmbH

          This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

          History
          : 31 January 2023
          : 13 December 2022
          Page count
          Figures: 6, Tables: 0, Pages: 10, Words: 6175
          Funding
          Funded by: Sichuan Science and Technology Program
          Award ID: 2020YFH0104
          Funded by: Fundamental Research Funds for the Central Universities , doi 10.13039/501100012226;
          Award ID: 20826041E4280
          Award ID: YJ201952
          Funded by: Sichuan University‐Zigong Special Fund for University‐Local Science and Technology Cooperation
          Award ID: 2020CDZG‐2
          Categories
          Research Article
          Research Articles
          Custom metadata
          2.0
          May 5, 2023
          Converter:WILEY_ML3GV2_TO_JATSPMC version:6.2.8 mode:remove_FC converted:05.05.2023

          binder‐free,lithium‐ion batteries,lithium iron phosphate,mono‐dispersed single‐walled carbon nanotubes,self‐supporting

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