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Interface Engineering Enables Wide-Temperature Li-Ion Storage in Commercial Silicon-Based Anodes
Chenwu Zhang1, Fengjun Ji1, Deping Li1
1State Key Laboratory of Advanced Welding and Joining, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 27, 2024
Summary
This study introduces an aluminum oxide (Al2O3) coating for silicon-carbon anodes in lithium-ion batteries. The coating enhances stability, improves performance across a wider temperature range, and boosts battery longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon anodes offer high capacity for lithium-ion batteries but suffer from interface instability and volume expansion issues.
- Electrolyte decomposition and byproduct formation at the silicon/electrolyte interface lead to poor battery performance and limited cycle life.
Purpose of the Study:
- To develop an artificial solid electrolyte interphase (SEI) using an aluminum oxide (Al2O3) coating on silicon-carbon (Si-C) anodes.
- To enhance the stability, ionic transport, and mechanical properties of Si-C anodes for improved lithium-ion battery performance.
Main Methods:
- Surface modification of Si-C anodes with a thin Al2O3 coating.
- Electrochemical testing of Al2O3-coated Si-C anodes in lithium-ion battery cells.
- Analysis of Coulombic efficiency, capacity retention, volume expansion, and operating temperature range.
Main Results:
- The Al2O3 coating acted as a protective barrier, preventing electrolyte decomposition and byproduct invasion.
- Al2O3-coated Si-C anodes demonstrated a high initial Coulombic efficiency (80%) and improved capacity retention (81.9% after 100 cycles).
- Volume expansion was significantly reduced (from 103% to 50%), and stable operation was achieved from 0 °C to 60 °C.
Conclusions:
- Surface Al2O3 coating effectively regulates interface reactions and enhances the electrochemical performance of Si-based anodes.
- This strategy offers a promising approach for developing robust and high-performance silicon anodes for next-generation lithium-ion batteries under practical conditions.
