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Poly(siloxane imide) Binder for Silicon-Based Lithium-Ion Battery Anodes via Rigidness/Softness Coupling
Liujia Ma1,2, Jian-Qiang Meng1, Ya-Jun Cheng2,3
1School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin, 300387, People's Republic of China.
Chemistry, an Asian Journal
|July 2, 2020
Summary
A novel poly(siloxane imide) copolymer binder enhances silicon anode performance in lithium-ion batteries by accommodating volume expansion, improving cyclic stability and rate capability.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Binders are essential for electrode mechanical integrity in lithium-ion batteries.
- Conventional binders lack elasticity, limiting their use with high-volume-change silicon anodes.
Purpose of the Study:
- To design, synthesize, and evaluate a poly(siloxane imide) copolymer (PSI) as a binder for silicon-based anodes.
- To investigate the rigidness/softness coupling mechanism of the PSI binder for accommodating silicon anode volume expansion.
Main Methods:
- Synthesis of a novel poly(siloxane imide) copolymer (PSI).
- Utilization of PSI as a binder for silicon nanoparticle anodes.
- Electrochemical performance testing, including cyclic stability and rate capability analysis.
Main Results:
- The PSI binder demonstrated a rigidness/softness coupling mechanism.
- This mechanism effectively accommodated the significant volume expansion of silicon anodes during lithiation.
- Improved cyclic stability and rate capability were observed for silicon nanoparticle anodes using the PSI binder.
Conclusions:
- The developed poly(siloxane imide) copolymer is a promising binder for high-performance silicon anodes.
- PSI binders offer a viable solution for managing volume changes in next-generation lithium-ion battery anodes.
