Dynamic hydrogen bond cross-linking binder with self-healing chemistry enables high-performance silicon anode in lithium-ion batteries

Jiahao Chen; Yaxin Li; Xinyuan Wu; Huihua Min; Jin Wang; Xiaomin Liu; Hui Yang

doi:10.1016/j.jcis.2023.12.057

Dynamic hydrogen bond cross-linking binder with self-healing chemistry enables high-performance silicon anode in lithium-ion batteries

J Colloid Interface Sci. 2024 Mar:657:893-902. doi: 10.1016/j.jcis.2023.12.057. Epub 2023 Dec 10.

Authors

Jiahao Chen¹, Yaxin Li¹, Xinyuan Wu¹, Huihua Min², Jin Wang¹, Xiaomin Liu³, Hui Yang⁴

Affiliations

¹ College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China.
² Electron Microscope Lab, Nanjing Forestry University, Nanjing 210037, Jiangsu, China.
³ College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China. Electronic address: liuxm@njtech.edu.cn.
⁴ College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China. Electronic address: yanghui@njtech.edu.cn.

PMID: 38091912
DOI: 10.1016/j.jcis.2023.12.057

Abstract

The structure instability and cycling decay of silicon (Si) anode triggered by stress buildup hinder its practical application to next-generation high-energy-density lithium-ion batteries (LIBs). Herein, a cross-linking polymeric network as a self-healing binder for Si anode is developed by in situ polymerization of tannic acid (TA) and polyacrylic acid (PAA) binder labelled as TA-c-PAA. The branched TA as a physical cross-linker complexes with PAA main chains through abundant dynamic hydrogen bonds, endowing the cross-linking TA-c-PAA binder with unique self-healing property and strong adhesion for Si anode. Benefiting from the mechanical robust and hard adhesion, the Si@TA-c-PAA electrode exhibits high reversible specific capacities (3250 mAh/g at 0.05C (1C = 4000 mA g^-1)), excellent rate capability (1599 mAh/g at 2C), and impressive cycling stability (1742 mAh/g at 0.25C after 450 cycles). After Ex situ morphology characterization, in situ swelling analysis, and finite element simulation, it is found that the TA-c-PAA binder allows the Si anode to dissipate stress and prevent pulverization during lithiation and delithiation, thus the hydrogen bonds among interpenetrating network may be adaptable to the stress intensity. Our work paves a new avenue for the design of efficient and cost-effective binders for next-generation Si anode in LIBs.

Keywords: Dynamic hydrogen bond; Lithium-ion batteries; Self-healing binder; Silicon anode.