Highly Stable Silicon Anode Enabled by a Water-Soluble Tannic Acid Functionalized Dual-Network Binder

Fang WU, Jiarun LIU, Ziyu YANG, Fei LI, Yong XIANG, Yilan PAN*, Zhiyu XUE*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

Abstract

Silicon (Si), a high-capacity electrode material, is crucial for achieving high-energy-density lithium-ion batteries. However, Si suffers from poor cycling stability due to its significant volume changes during operation. In this work, a tannic acid functionalized aqueous dual-network binder with an intramolecular tannic acid functionalized network has been synthesized, which is composed of covalent-cross-linked polyamide and ionic-cross-linked alginate (Alg(Ni)-PAM-TA), and employed as an advanced binder for stabilizing Si anodes. The resultant Alg(Ni)-PAM-TA binder, incorporating diverse functional groups including amide, carboxylic acid, and dynamic hydrogen bonds, can easily interact with both Si nanoparticles and the Cu foil, thereby facilitating the formation of a highly resilient network characterized by exceptional adhesion strength. Moreover, molecular dynamics (MD) simulations indicate that the Alg(Ni)-PAM-TA network shows an increased intramolecular hydrogen bond number with increasing concentration of TA and a decreased intramolecular hydrogen bond between PAM and Alg as a result of the aggregation behavior of tannic acids themselves. Consequently, the binder significantly enhances the Si electrode’s integrity throughout repeated charge/discharge cycles. At a current density of 0.84 A g-1, the Si electrode retains a capacity of 1863.4 mAh g-1 after 200 cycles. This aqueous binder functionalized with the intramolecular network via the incorporation of TA molecules holds great promise for the development of high-energy-density lithium-ion batteries.

Original languageEnglish
Pages (from-to)23396-23405
Number of pages10
JournalACS Applied Materials and Interfaces
Volume16
Issue number18
Early online date26 Apr 2024
DOIs
Publication statusPublished - 8 May 2024
Externally publishedYes

Bibliographical note

The authors gratefully acknowledge the financial support by The National Natural Science Foundation of China (22008026,5220221) and Natural Science Foundation of Sichuan Province (2023NSFSC0956).

Keywords

  • alginate
  • aqueous binder
  • dual-network
  • lithium-ion batteries
  • silicon
  • tannic acid

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