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High Initial Coulombic Efficiency of SiO Enabled by Controlling SiO2 Matrix Crystallization
Geunho Choi1, Jeonghan Kim1, Byoungwoo Kang1
1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
ACS Applied Materials & Interfaces
|September 20, 2022
Summary
Silicon oxycarbide (SiO) anodes for lithium-ion batteries show improved initial Coulombic efficiency (ICE) and stability. A novel chemical treatment enhances SiO
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Silicon oxycarbide (SiO) is a promising anode material for lithium-ion batteries, offering higher capacity than graphite.
- However, SiO's practical application is limited by its poor initial Coulombic efficiency (ICE).
Purpose of the Study:
- To develop a new method for enhancing the ICE of SiO anodes.
- To achieve high capacity and long-term cycle stability simultaneously in SiO.
Main Methods:
- Amorphous SiO2 in SiO was crystallized by reacting with LiOH·H2O at 900 °C.
- Controlled crystallization of SiO was achieved to reduce irreversible electrochemical reactions.
Main Results:
- The Li-added SiO demonstrated a significantly increased ICE of approximately 82.7%.
- The material achieved high reversible capacity and superior capacity retention (100% at 1C for 100 cycles).
Conclusions:
- Controlling SiO crystallization is key to simultaneously achieving high ICE, capacity, and stability.
- This approach offers a pathway for designing advanced SiO anodes for high energy density batteries.
