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Reversible Silicon Anodes with Long Cycles by Multifunctional Volumetric Buffer Layers.

Tiansheng Mu^1,2, Shuaifeng Lou¹, Nathaniel Graham Holmes²

¹MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

ACS Applied Materials & Interfaces

|January 14, 2021

Summary

A novel silicon composite anode (T-Si@C) with integrated free space and carbon shells enhances stability and lithium-ion diffusion for high energy density lithium-ion batteries. This design ensures long-term cycling reversibility and improved rate capability.

Keywords:

free space ion-electron transport mechanical stability multifunctional buffer silicon anodes

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Silicon anodes are crucial for high energy density lithium-ion batteries.
Volume expansion during cycling leads to instability and capacity fading.
Developing stable silicon anodes is essential for advanced battery performance.

Purpose of the Study:

To design and synthesize a stable silicon composite anode (T-Si@C) for improved lithium-ion battery performance.
To investigate the role of integrated free space and carbon shells doped with nanoparticles in enhancing anode stability.
To evaluate the electrochemical performance and cycling reversibility of the T-Si@C anode.

Main Methods:

Synthesis of a silicon composite anode (T-Si@C) featuring free space and mixed carbon shells.
Doping carbon shells with rigid TiO2/Ti5Si3 nanoparticles.
Electrochemical characterization including cycling performance and rate capability tests.
Fabrication and testing of T-Si@C//LiFePO4 full cells.

Main Results:

The T-Si@C anode effectively accommodates silicon volume fluctuations.
Embedded TiO2/Ti5Si3 nanoparticles enhance structural stability and lithium-ion diffusion.
The T-Si@C anode exhibits excellent lithium storage performance with long-term cycling reversibility.
Good rate capability and superior electrochemical reversibility in full cells were achieved.

Conclusions:

Rational structural design of silicon anodes is critical for achieving long cycle life.
The T-Si@C composite anode offers a promising strategy for developing advanced silicon anodes.
This work provides insights into creating stable and high-performance silicon anodes for lithium-ion batteries.