A solvent molecule reconstruction strategy enabling a high-voltage ether-based electrolyte

Peng, Xudong; Wang, Tianshuai; Liu, Bin; Li, Yiju; Zhao, Tianshou

doi:10.1039/d2ee02344j

Cited by 44 publications

(28 citation statements)

References 50 publications

(63 reference statements)

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“…[ 29 ] This means, extremely high salt‐to‐solvent ratio (SSR) and diluent‐to‐solvent ratio (DSR) is still required to realize the desired CIP structure, which inevitably incur low ionic conductivity and high cost. [ 30 ] More importantly, in the Na–S system, the solvation configuration in the inner‐shell not only dictates anode stability, but also controls the sodium polysulfide (NaPS) conversion. However, how the interaction among solvent, diluent, and Na + ‐anion/NaPS impact the performance remain elusive, and the design rules are not well established.…”

Section: Introductionmentioning

confidence: 99%

Electrolytes with Solvating Inner Sheath Engineering for Practical Na–S Batteries

et al. 2023

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Sodium–sulfur (Na–S) batteries with durable Na‐metal stability, shuttle‐free cyclability, and long lifespan are promising to large‐scale energy storages. However, meeting these stringent requirements poses huge challenges with the existing electrolytes. Herein, a localized saturated electrolyte (LSE) is proposed with 2‐methyltetrahydrofuran (MeTHF) as an inner sheath solvent, which represents a new category of electrolyte for Na–S system. Unlike the traditional high concentration electrolytes, the LSE is realized with a low salt‐to‐solvent ratio and low diluent‐to‐solvent ratio, which pushes the limit of localized high concentration electrolyte (LHCE). The appropriate molecular structure and solvation ability of MeTHF regulate a saturated inner sheath, which features a reinforced coordination of Na+ to anions, enlarged Na+‐solvent distance, and weakened anion‐diluent interaction. Such electrolyte configuration is found to be the key to build a sustainable interphase and a quasi‐solid–solid sulfur redox process, making a dendrite‐inhibited and shuttle‐free Na–S battery possible. With this electrolyte, pouch cells with decent cycling performance under rather demanding conditions are demonstrated.

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Section: Introductionmentioning

confidence: 99%

Electrolytes with Solvating Inner Sheath Engineering for Practical Na–S Batteries

et al. 2023

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“…Realizing this beneficial SEI by employing ether electrolytes will still require accommodation for their relatively poor high-voltage stability, 54,55 which currently prevent their use with high-voltage cathode materials. 56 Continued research into strategies that overcome their limited oxidation stability are ongoing, [57][58][59] and include employing a high salt concentration, 60,61 forming a localized high concentration via use of a cosolvent, 62 or by inclusion of stabilizing additives. 63,64…”

Section: Discussionmentioning

confidence: 99%

The role of an elastic interphase in suppressing gas evolution and promoting uniform electroplating in sodium metal anodes

Chen

Zhang

et al. 2023

Energy Environ. Sci.

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“…In optimum condition, the Li||LiNCM622 battery with 5.0 wt % PFPBA‐contained electrolyte delivered 91.2 % capacity retention after 400 cycles at 4.6 V charge cut‐off voltage. Compared with recent other electrolyte research, the cycling stability achieved by our electrolyte strategy shows that the armor‐like inorganic‐rich CEI with high mechanical strength and high ionic conductivity can more effectively stabilize the high‐voltage cycle performance (Table S1) [5, 34, 37–41] …”

Section: Introductionmentioning

confidence: 88%

Armor‐like Inorganic‐rich Cathode Electrolyte Interphase Enabled by the Pentafluorophenylboronic Acid Additive for High‐voltage Li||NCM622 Batteries

et al. 2023

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Lithium metal batteries (LMBs) comprising Li metal anode and high-voltage nickel-rich cathode could potentially realize high capacity and power density. However, suitable electrolytes to tolerate the oxidation on the cathode at high cut-off voltage are urgently needed. Herein, we present an armor-like inorganic-rich cathode electrolyte interphase (CEI) strategy for exploring oxidation-resistant electrolytes for sustaining 4.8 V Li j j LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) batteries with pentafluorophenylboronic acid (PFPBA) as the additive. In such CEI, the armored lithium borate surrounded by CEI up-layer represses the dissolution of inner CEI moieties and also improves the Li + conductivity of CEI while abundant LiF is distributed over whole CEI to enhance the mechanical stability and Li + conductivity compared with polymer moieties. With such robust Li + conductive CEI, the Li j j NCM622 battery delivered excellent stability at 4.6 V cut-off voltage with 91.2 % capacity retention after 400 cycles. The excellent cycling performance was also obtained even at 4.8 V cut-off voltage.

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A solvent molecule reconstruction strategy enabling a high-voltage ether-based electrolyte

Abstract: Electrolytes of high compatibility with Li metal anodes (LMAs) and high voltage resistance are critical for high-energy-density Li-metal batteries (LMBs). Localized high-concentration electrolytes (LHCEs) have been recently demonstrated, which, however,...

Cited by 44 publications

References 50 publications

Electrolytes with Solvating Inner Sheath Engineering for Practical Na–S Batteries

Electrolytes with Solvating Inner Sheath Engineering for Practical Na–S Batteries

The role of an elastic interphase in suppressing gas evolution and promoting uniform electroplating in sodium metal anodes

Armor‐like Inorganic‐rich Cathode Electrolyte Interphase Enabled by the Pentafluorophenylboronic Acid Additive for High‐voltage Li||NCM622 Batteries

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