About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Materials for Energy Conversion and Storage 2026
|
| Presentation Title |
Phase-Controlled Dual Redox Mediator Enabled High-Performance All-Solid-State Lithium–Sulfur Batteries |
| Author(s) |
Se Young Kim, Hamin Choi, Eunbyoul Lee, KyuJung Jun, Kyung Yoon Chung |
| On-Site Speaker (Planned) |
Se Young Kim |
| Abstract Scope |
All-solid-state lithium-sulfur batteries (ASSLSBs) emerge as next-generation energy storage systems due to high theoretical capacity (1,672 mAh g⁻¹) and ability to mitigate sulfur shuttle effects in liquid electrolytes (LEs). However, interfacial resistance at sulfur/solid electrolytes (SEs) interfaces, sulfur’s insulating nature and volume changes hinder performance. We introduce a new hybrid cathode incorporating tungsten sulfide (WS2) as a dual redox mediator (DRM) utilizing unprecedented W4+/5+/6+ redox. It enhances electron and Li⁺ transport facilitating sulfur redox and stabilizing interfacial resistance via WS2’s DRM mechanism. WS2 forms reversible amorphous LixWS(4-α) instead of LiWS2, which irreversibly reduces to W metal and Li2S. This unique mechanism further mitigated the total volume expansion during cycling. The hybrid cathode in ASSLSB retains ~83 % with discharge capacity of 831 mAh‧g⁻¹ after 50 cycles at low pressure (~0.3 MPa) and room temperature (25 ℃), whereas conventional sulfur cathodes retain 34% and 371 mAh g⁻¹. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Ceramics, Composites |