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Improving Electrochemical Performance of Thick Silicon Film Anodes with Implanted Solid Lithium Source Electrolyte
Zhaozhe Yu1,2, Lihang Zhou1, Jiali Tong1
1Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology, Guilin University of Electronic Technology, Guilin 541004, PR China.
The Journal of Physical Chemistry Letters
|September 12, 2022
Summary
Researchers improved silicon anode performance for lithium-ion batteries by preimplanting a solid lithium source electrolyte. This strategy enhances electrochemical properties, enabling high capacity and long cycle life for advanced battery designs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon anodes offer high theoretical capacity for lithium-ion batteries but suffer from poor conductivity, volume expansion, and irreversible capacity loss.
- These limitations hinder the practical application of silicon in next-generation energy storage devices.
Purpose of the Study:
- To enhance the electrochemical performance of silicon anode materials for lithium-ion batteries.
- To address the challenges of poor electrical conductivity, large volume changes, and high irreversible capacity in silicon anodes.
Main Methods:
- A simple strategy involving pre-implantation of a solid lithium source electrolyte (Li2CO3 and Li2O) into a silicon (Si) thick film was employed.
- The implanted electrolyte was designed to participate in and induce the formation of a stable solid electrolyte interphase (SEI) within the Si film and at particle interfaces.
Main Results:
- The modified silicon thick film (∼10 μm) exhibited a specific capacity exceeding 2000 mAh g⁻¹.
- An initial Coulombic efficiency of over 92% was achieved.
- The material demonstrated approximately 87% capacity retention over 150 cycles at a current density of 400 mA g⁻¹.
Conclusions:
- Pre-implanting a solid lithium source electrolyte is an effective method to improve the electrochemical properties of silicon anodes.
- This approach facilitates the formation of a beneficial SEI layer, leading to high capacity and enhanced cycle life.
- The findings offer insights for designing high-performance electrode materials for various battery applications.
