About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Materials for Energy Conversion and Storage 2023
|
| Presentation Title |
On the Specific Capacity and Cycle Stability of Si Anodes: Effects of Charge/Discharge Protocol |
| Author(s) |
Bingyu Lui, Mei Luo, Ziyong Wang, Christopher Passolano, Leon L. Shaw |
| On-Site Speaker (Planned) |
Leon L. Shaw |
| Abstract Scope |
Silicon has potential to be a high-performance anode material, but its practical application is impeded by huge volume expansion during lithiation. Here we show that by introducing engineered voids into a Si/C core-shell structure to form Si@void@C structure, volume expansion of Si@void@C particles can be minimized, thereby improving the cycle stability. We further investigate the effects of charge/discharge protocol, showing that lower and upper cutoff voltages in charge/discharge have profound impact on the specific capacity and cycle stability. Importantly, cutoff voltages in formation cycles have long-lasting effects on the cycle stability, indicating the critical role of forming a robust SEI layer during formation cycles. Using constant current charge followed by potentiostatic hold charge can further improve the cycle stability. With proper choices of charge/discharge protocols, the specific capacity of Si@void@C anodes at the electrode level is 71% higher than that of graphite anodes over 300 cycles with 82% capacity retention. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Other, |