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Electrically Conductive Shell-Protective Layer Capping on the Silicon Surface as the Anode Material for
Ruiqi Na1, Krysten Minnici, Guoyan Zhang
1Key Laboratory of High Performance Plastics, Ministry of Education, College of Chemistry , Jilin University , Changchun 130012 , PR China.
ACS Applied Materials & Interfaces
|October 4, 2019
Summary
Researchers developed a new silicon anode (Si@PPBT) for lithium-ion batteries (LIBs) to overcome volume expansion issues. This innovative design significantly enhances battery performance and longevity, paving the way for more durable LIBs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon anodes offer high theoretical capacity for lithium-ion batteries (LIBs).
- Significant volumetric changes during cycling lead to capacity fading and poor cycle life.
- Effective strategies are needed to mitigate these volume expansions for practical LIB applications.
Purpose of the Study:
- To rationally design and construct silicon (Si) electrode structures that accommodate large volumetric changes during charge/discharge.
- To develop a novel Si anode material (Si@PPBT) with a poly[3-(potassium-4-butanoate)thiophene] (PPBT) capping layer to enhance stability and performance.
- To evaluate the electrochemical performance of the Si@PPBT anode in LIBs.
Main Methods:
- Synthesized Si nanoparticles coated with an electrically conductive PPBT capping layer (Si@PPBT).
- Fabricated anodes using Si@PPBT integrated with carboxymethyl cellulose (CMC) binder.
- Conducted electrochemical testing, including cycling stability and rate capability measurements.
Main Results:
- The PPBT layer effectively buffered Si volume expansion, improved binder dispersion, and enhanced electrolyte uptake.
- Si@PPBT anodes maintained electrical contact and stabilized the solid electrolyte interphase (SEI) layer.
- Achieved a high initial Coulombic efficiency of 84.9% and a reversible capacity of 1793 mA h g-1 after 200 cycles, 3.4 times higher than pristine Si anodes.
Conclusions:
- The Si@PPBT design effectively addresses the volumetric challenges of silicon anodes in LIBs.
- This approach demonstrates superior cycling stability and rate capability compared to traditional Si anodes.
- The Si@PPBT strategy offers a promising pathway for developing high-performance and durable LIBs, applicable to other high-volume-change anode materials.
