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Expanded Nanofibrous Cellulose Electrode Binder: Declustering Lithium Polysulfides for Lean-Electrolyte Li‒S
Hyunseok Moon1, Jung-Hui Kim1, Nan Yao2
1Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
Advanced Materials (Deerfield Beach, Fla.)
|April 7, 2025
Summary
A new cellulose nanofiber binder improves lithium-sulfur batteries by preventing polysulfide clustering in lean electrolytes. This enhances energy density and sulfur utilization for advanced battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium-sulfur (Li-S) batteries offer potential but face energy density limits due to high electrolyte requirements.
- Lean electrolytes reduce electrolyte volume but can worsen lithium polysulfide (LiPS) clustering, hindering performance.
Purpose of the Study:
- To develop an effective electrode binder for lean-electrolyte Li-S batteries.
- To address LiPS clustering and improve sulfur utilization and energy density.
Main Methods:
- Utilized TEMPO-oxidized cellulose nanofiber (TOCN) as a binder in Li-S battery cathodes.
- Investigated the effect of TOCN's fibrous structure and inter-glucose spacing on LiPS interactions.
- Tested cells with high sulfur loading and lean electrolyte conditions.
Main Results:
- TOCN binder suppressed LiPS clustering even at 1 wt% loading.
- Achieved high sulfur loading (72 wt%) and specific capacity (1221 mAh g⁻¹).
- Demonstrated high cell-level energy density (503 Wh kg⁻¹) under lean electrolyte conditions.
Conclusions:
- TOCN is a promising binder for lean-electrolyte Li-S batteries.
- The binder's structure facilitates LiPS interaction, improving electrochemical performance.
- Achieved superior energy density compared to conventional binders in Li-S systems.
