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A Spidroin-Inspired Hierarchical-Structure Binder Achieves Highly Integrated Silicon-Based Electrodes
Pengzhou Mu1,2,3,4, Shu Zhang1,2,3, Huanrui Zhang1,2,3
1Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|July 20, 2023
Summary
A novel biomimetic binder stabilizes silicon electrodes in high-energy lithium-ion batteries, overcoming capacity fading caused by volume changes. This innovation extends electrode cycle life for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Silicon-based electrodes offer high capacity for next-generation lithium-ion batteries.
- Significant volume changes during cycling lead to rapid capacity fading, hindering practical application.
Purpose of the Study:
- To develop a novel binder that accommodates silicon electrode volume changes.
- To enhance the stability and cycle life of silicon-based electrodes.
Main Methods:
- Development of an aqueous-oil binary solution based blend (AOB) binder with a spidroin-like hierarchical structure.
- Incorporation of a hydrophobic polymer (PPB) and water-soluble poly(acrylic acid) to mimic spidroin structures.
- Testing of the AOB binder in Si/C composite anode and NCM811 cathode soft package cells.
Main Results:
- The AOB binder exhibits high tensile strength, elasticity, and electrode adhesion.
- Demonstrated stabilization of the silicon-based electrode structure during cycling.
- Achieved a discharge specific capacity of 2.92 Ah after 700 cycles in 3.3 Ah soft package cells.
Conclusions:
- The biomimetic AOB binder effectively mitigates capacity fading in silicon electrodes.
- This strategy significantly prolongs electrode cycle life, enabling high-energy-density lithium-ion battery applications.
- Represents a milestone in advancing silicon-based electrodes for practical battery use.
