Ultralight Electrolyte for High‐Energy Lithium–Sulfur Pouch Cells

Liu, Tao; Li, Huajun; Yue, Jinming; Feng, Jingnan; Mao, Minglei; Zhu, Xiangzhen; Hu, Yong‐Sheng; Li, Hong; Huang, Xuejie; Chen, Liquan; Suo, Liumin

doi:10.1002/ange.202103303

Cited by 13 publications

(2 citation statements)

References 53 publications

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“…Especially for the external pressure, however, important information on the testing procedures of reported pouch cells is often not stated. Mostly it is not mentioned whether the pressure is applied [11][12][13][14][15][16][17] or the exact pressure is not given [18,19]. This is especially problematic since it was demonstrated in the literature that the application of external pressure on the cell stack may have a beneficial influence on especially the cycle life of lithium anodes.…”

Section: Introductionmentioning

confidence: 99%

Influence of external stack pressure on the performance of Li-S pouch cell

et al. 2022

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The lithium-sulfur (Li-S) cell system is promising to satisfy the increasing need for cost-efficient energy storage with high theoretical energies due to the enormous theoretical gravimetrical capacity and the abundance of sulfur. Furthermore, the technology readiness level of Li-S batteries increased steadily in recent years due to extensive research, as well as the number of reported prototype cells. However, an often ignored test parameter is the application of external pressure to the cell stack. In this study, the influence of external pressure on the performance of Li-S cells is investigated. Therefore, five-layered pouch cells with solvent-free processed cathodes are assembled. These cells are tested under lean electrolyte conditions (electrolyte to sulfur ratio of 4.5 µl mg(S)−1). To evaluate the influence of the used electrolyte system either the state-of-the-art 1,2-dimethoxyethane/1,3-dioxolane electrolyte or the sparing polysulfide solvating hexyl methyl ether/1,3-dioxolane electrolyte is deployed. The impact of pressure application is evaluated electrochemically as well as by post-mortem focused ion beam-scanning electron microscopy of the cycled electrodes. Moreover, a technique for infiltration of sulfur into the carbon host matrix is presented, discussed, and successfully implemented.

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Section: Introductionmentioning

confidence: 99%

Influence of external stack pressure on the performance of Li-S pouch cell

et al. 2022

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“…Indeed, the long-chain polysulfides (Li 2 S n ) generated by the S 8 in the discharge process are easily dissolved in the ether electrolyte, thereby leaving the shuttling in the electrolyte, thus resulting in the decrease in capacity, Coulomb efficiency and cycle stability of Li–S cells [ 26 ]. In the pouch cell, the dosage of the injected electrolyte usually needs to be carefully calculated to ensure the overall energy density of assembled cell is comparable to the existing lithium-ion cells [ 27 – 29 ]. Accordingly, a low dosage of electrolyte with E / S < 5 is needed.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Lithium Fluoride Interface for Dendrite-Free Lithium Anode to Prolong the Cyclic Stability of Lithium–Sulfur Pouch Cells

et al. 2022

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Lithium–sulfur (Li–S) cells have been regarded as attractive alternatives to achieve higher energy densities because of their theoretical specific energy far beyond the lithium-ion cells. However, the achieved results of Li–S cells are exaggerating the cycle performance in their pouch formats because the considerable works are based on the coin cells where flood electrolyte and endless Li supply ensure the Li metal with nature structure features, resulting in a negligible effect on cycle performance caused by the Li dendrites and electrolyte dissipation during cycles. Herein, we demonstrate a strategy to enable the Li metal with lithium fluoride (LiF)-rich solid electrolyte interface via integrating a reinforced interface (RI) embedded with nano-LiF particles on the surface of the Li metal anode. The RI interface enables the solvent molecules of the electrolyte to gain fewer electrons from Li anode, resulting in a lower leakage current of assembled RI||Li–S cell (~ 0 μA) than pristine Li anode (~ 1.15 µA). Moreover, these results show that suppressing lithium dendrite growth is more urgent than inhibiting the shuttle effect of polysulfides in the pouch cell format. As a result, the RI layer-engineered Li metal bears witness to the cyclic stability of Li anode over 800 h, thus achieving stable cycles of Ah-scale Li–S pouch cell with an energy density of 410 Wh/kg at a current of 200 mA per cell. Our study demonstrates that the suppression of lithium dendrites by the RI could be a promising method to prolong the cycle number of Li–S pouch cells.

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Reclaiming Inactive Lithium with a Triiodide/Iodide Redox Couple for Practical Lithium Metal Batteries

et al. 2021

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High-energy-density lithium (Li)m etal batteries suffer from as hort lifespan owing to apparently ceaseless inactive Li accumulation, which is accompanied by the consumption of electrolyte and active Li reservoir,s eriously deteriorating the cyclability of batteries.H erein, at riiodide/ iodide (I 3 À /I À )redox couple initiated by stannic iodide (SnI 4 )is demonstrated to reclaim inactive Li. The reduction of I 3 À converts inactive Li into soluble LiI, which then diffuses to the cathode side.T he oxidation of LiI by the delithiated cathode transforms cathode into the lithiation state and regenerates I 3 À ,r eclaiming Li ion from inactive Li. The regenerated I 3 À engages the further redox reactions.F urthermore,t he formation of Sn mitigates the corrosion of I 3 À on active Li reservoir sacrificially.I nw orking Li j Li-Ni 0.5 Co 0.2 Mn 0.3 O 2 batteries,t he accumulated inactive Li is significantly reclaimed by the reversible I 3 À /I À redox couple, improving the lifespan of batteries by twice.This work initiates ac reative solution to reclaim inactive Li for prolonging the lifespan of practical Li metal batteries.

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Ultralight Electrolyte for High‐Energy Lithium–Sulfur Pouch Cells

Cited by 13 publications

References 53 publications

Influence of external stack pressure on the performance of Li-S pouch cell

Influence of external stack pressure on the performance of Li-S pouch cell

Tailoring Lithium Fluoride Interface for Dendrite-Free Lithium Anode to Prolong the Cyclic Stability of Lithium–Sulfur Pouch Cells

Reclaiming Inactive Lithium with a Triiodide/Iodide Redox Couple for Practical Lithium Metal Batteries

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