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Extending the Lifespan of Soluble Lead Flow Batteries with a Sodium Acetate Additive
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Enhancing Li-S Battery Performance with Limiting Li[N(SO2F)2] Content in a Sulfolane-Based Sparingly Solvating
Jiali Liu1, Shanglin Li2, Nao Nomura2
1Advanced Chemical Energy Research Center, Institute of Advanced Sciences, Yokohama National University, Yokohama 240-8501, Japan.
ACS Applied Materials & Interfaces
|February 8, 2024
Summary
Researchers improved lithium-sulfur battery lifespan by controlling the solid electrolyte interface (SEI) film and lithium deposition. Elevated initial charging temperatures enhanced lithium reversibility and cycling performance in pouch cells.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high energy density but suffer from short lifespans due to lithium anode instability and dendrite formation.
- Lithium bis(fluorosulfonyl)imide (Li[FSA]) in electrolytes can form inorganic-rich solid electrolyte interphase (SEI) films, stabilizing the lithium anode.
- Side reactions between lithium polysulfides (LiPSs) and [FSA] anions limit the effectiveness of Li[FSA]-based electrolytes in Li-S batteries.
Purpose of the Study:
- To investigate the impact of SEI composition and lithium morphology on lithium anode reversibility in Li-S batteries.
- To optimize electrolyte design and initial charging conditions to enhance the cycling performance of Li-S batteries.
Main Methods:
- Utilized a LiPS sparingly solvating electrolyte with a controlled, restricted content of Li[FSA].
- Implemented an elevated temperature during the initial charging process to influence SEI formation and lithium deposition.
- Evaluated lithium anode reversibility and cycling performance in practical Li-S pouch cells under optimized conditions.
Main Results:
- Achieved significant enhancement in lithium anode reversibility by controlling SEI composition and lithium morphology.
- The optimized electrolyte and initial charging strategy mitigated detrimental side reactions.
- Demonstrated enhanced cycling performance in practical Li-S pouch cells, indicating improved battery lifespan.
Conclusions:
- Controlling SEI film composition and lithium morphology through electrolyte design and thermal management is crucial for Li-S battery performance.
- Elevated initial charging temperature in a LiPS sparingly solvating electrolyte with restricted Li[FSA] content effectively improves lithium reversibility.
- The findings present a viable strategy for enhancing Li-S battery cycling performance despite challenges in electrolyte development.
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