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


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
Issue number18
Early online date26 Apr 2024
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).


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


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