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Confined Solid Electrolyte Interphase Growth Space with Solid Polymer Electrolyte in Hollow Structured Silicon Anode
Tianyi Ma1, Xiangnan Yu1, Xiaolu Cheng1
1Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
ACS Applied Materials & Interfaces
|April 5, 2017
Summary
Researchers developed hollow silicon spheres filled with solid polymer electrolyte to improve lithium-ion battery anodes. This novel approach enhances cycle stability and capacity by controlling solid electrolyte interphase (SEI) growth.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon anodes offer high specific capacity for lithium-ion batteries.
- Challenges include significant volume change during cycling, leading to electrode degradation and excessive solid electrolyte interphase (SEI) growth.
Purpose of the Study:
- To design a novel approach to mitigate volume expansion and control SEI growth in silicon anodes.
- To enhance the cycle stability and performance of silicon-based lithium-ion batteries.
Main Methods:
- Fabrication of hollow silicon spheres filled with solid polymer electrolyte (SPE).
- Electrochemical characterization including specific capacity and cycle stability testing.
- Investigation of SEI growth behavior using electrochemical impedance spectroscopy and differential scanning calorimetry.
Main Results:
- The composite material achieved a high specific capacity exceeding 2100 mAh g-1.
- Demonstrated long-term cycle stability with a reversible capacity of 1350 mAh g-1 over 500 cycles.
- SPE effectively confined excessive SEI growth, occupying space and preventing electrode disintegration.
Conclusions:
- The SPE-filled hollow silicon spheres significantly improve the cycle performance and Coulombic efficiency of lithium-ion batteries.
- This strategy effectively addresses the volume expansion issue of silicon anodes.
- The findings present a promising pathway for developing advanced energy storage devices.