Small Things Make a Big Difference: Conductive Cross-Linking Sodium Alginate@MXene Binder Enables High-Volumetric-Capacity and High-Mass-Loading Li-S Battery

Lu Cheng, Ruiyuan Tian, Yifan Zhao, Zhixuan Wei, Xin Pu, You Liang Zhu, Dong Zhang, Fei Du

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Binders are crucial for maintaining the integrity of an electrode, and there is a growing need for integrating multiple desirable properties into the binder for high-energy batteries, yet significant challenges remain. Here, we successfully synthesized a new binder by cross-linking sodium alginate (SA) with MXene materials (Ti3C2Tx). Besides the improved adhesion and mechanical properties, the integrated SA@Ti3C2Tx binder demonstrates much improved electronic conductivity, which enables ruling out the fluffy conductive additive from the electrode component with enhanced volumetric capacity. When SA@Ti3C2Tx is used to fabricate sulfur (S) cathodes, the conductive-additive-free electrode demonstrates extremely high capacity (1422 mAh cm-3/24.5 mAh cm-2) under an S loading of 17.2 mg cm-2 for Li-S batteries. Impressively, the SA@Ti3C2Tx binder shows remarkable feasibility in other battery systems such as Na-S and LiFePO4 batteries. The proposed strategy of constructing a cross-linking conductive binder opens new possibilities for designing high-mass-loading electrodes with high volumetric capacity.

Original languageEnglish
Pages (from-to)10538-10544
Number of pages7
JournalNano Letters
Volume23
Issue number22
DOIs
StatePublished - 22 Nov 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • Li−S battery
  • MXene
  • cross-linking binder
  • high mass loading
  • high volumetric capacity

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