Title:AI Enabled High-Performance Li-S Battery Design: Material Innovations and Reevaluating the Role of LiPSs
Speaker: Gao Xin
Time: March 27, 10:00
Venue:Building 5, Phase II of Nano Valley, Zhongxin Knowledge City, Huangpu District, Guangzhou
Room 529, 5th Floor, Huagong Paper-based Materials Innovation Research Institute, Huangpu District, Guangzhou
[Abstract]
Lithium-sulfur (Li-S) batteries with high energy density and low cost are promising for next-generation energy storage. However, their cycling stability is plagued by the high solubility of lithium polysulfide (LiPS) intermediates, causing fast capacity decay and severe self-discharge. Exploring electrolytes with low LiPS solubility has shown promising results toward addressing these challenges. However, here, we report that electrolytes with moderate LiPS solubility are more effective for simultaneously limiting the shuttling effect and achieving good Li-S reaction kinetics. We explored a range of solubility from 37 to 1,100 mM (based on S atom, [S]) and found that a moderate solubility from 50 to 200 mM [S] performed the best. Using a series of electrolyte solvents with various degrees of fluorination, we formulated the Single-Solvent, Single-Salt, Standard Salt concentration with Moderate LiPSs solubility Electrolytes (termed S6MILE) for Li-S batteries.Among the designed electrolytes,Li-S cells using fuorinated-1,4-dimethoxybutane S6MILE gave the highest capacity of 1,526 mAh g-1 at 0.05 C and an average CE of 99.89% for 150 cycles at 0.2 C under lean electrolyte conditions.Moreover,we observed a long calendar aging life, with a capacity increase/recovery of 4.3% after resting for 30 d. Furthermore, the correlation between LiPS solubility,degree of fluorination of the electrolyte solvent,and battery performance was systematically investigated.
Announced by School of Light Industry and Engineering
