Journal of Power Sources, Journal Year: 2024, Volume and Issue: 624, P. 235563 - 235563
Published: Oct. 5, 2024
Language: Английский
Carbon Neutralization, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 3, 2024
ABSTRACT The solvent‐rich solvent sheath in low‐concentration electrolytes (LCEs) not only results high desolvation energy of Li + , but also forms organic‐rich solid electrolyte interface film (SEI) with poor conductivity, which hinders transport at the electrode‐electrolyte and greatly limits application LCEs. Here, electrochemical performance LCEs is enhanced by dual interfacial modification LiNO 3 vinylene carbonate (VC) additives. Results show that preferentially reduced about 1.65 V to form an inorganic‐rich incomplete SEI inner layer. formation N LiN x O y inorganic components helps achieve rapid film, bare electrode surface caused layer provides a place for subsequent decomposition VC. Then, lower potential 0.73 V, VC generate poly(VC)‐rich outer layer, lithium‐philic sites weakens interaction between ethylene (EC). modulates solvation structure reduces . This ingenious design bilayer enhances inhibits traditional solvents swelling graphite. As result, battery using 0.5 M LiPF 6 EC/diethyl (DEC) 0.012 vt% improved higher level than one 1.0 EC/DEC electrolyte. research expands strategy promising applications constructing favorable enhance interface.
Language: Английский
Citations
10
Next Energy, Journal Year: 2024, Volume and Issue: 3, P. 100115 - 100115
Published: March 23, 2024
Lithium-ion batteries (LIBs) often encounter performance decline issues in cold conditions when temperature significantly drops, despite being widely regarded as a leading battery technology. Functioning typical rocking-chair battery, lithium ions shuttle through the "blood" (the electrolyte) of LIBs between graphite anode commonly-used negative electrode) and intercalation compound cathode (positive electrode), where ion movement tends to slow down with decreasing temperature. Considering relative maturity electrode materials, researchers generally pay attention electrolyte corresponding electrode/electrolyte interphase order accelerate transport. In light significant advancements, we herein try delineate categorize engineering depict what next can be done build better suitable for cooler temperatures near future. Specifically, advances are summarized goal improving ionic conductivity bulk electrolyte, facilitating desolvation dynamics at interface, accelerating across interfacial film. Furthermore, viable strategies outlined understand design principles low-temperature inspire more endeavors overcome critical challenges faced by extreme conditions.
Language: Английский
Citations
9
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: June 27, 2024
Abstract Lithium‐ion batteries (LIBs) suffer from energy loss and safety hazards under high‐rate conditions, because of the sluggish electrochemical kinetics unstable interfacial passivation. Herein, a PC‐based electrolyte using weakly solvated solvent ethyl trifluoroacetate is developed to improve stability in LIBs. A microsolvating competition revealed bulk electrolyte, forming loose Li + coordination configuration with benign affinity high ionic conductivity. Furthermore, an inorganic‐rich interphase constructed on graphite anode, affording smooth desolvation reliable Consequently, NCM622/graphite cell shows improved cycling (82.2% after 200 cycles) rate capability (83% at 4C compared 0.1C) high‐voltage 4.5 V, much better than those EC‐based (76.2% cycles 74% 4C). Additionally, affords reversible operation –40 °C while fails °C. This work highlights potential solvation structure engineering for low‐energy‐barrier electrolyte.
Language: Английский
Citations
8
Chemical Science, Journal Year: 2024, Volume and Issue: 15(34), P. 13768 - 13778
Published: Jan. 1, 2024
Lithium-ion batteries (LIBs) are extensively employed in various fields. Nonetheless, LIBs utilizing ethylene carbonate (EC)-based electrolytes incur capacity degradation a wide-temperature range, which is attributable to the slow Li+ transfer kinetics at low temperatures and solvent decomposition during high-rate cycling high temperatures. Here, we designed novel electrolyte by substituting nitrile solvents for EC, characterized de-solvation energy ionic conductivity. The correlation between carbon chain length of with reduction stability Li+-solvated coordination was investigated. results revealed that valeronitrile (VN) displayed an enhanced lowest unoccupied molecular orbital level energy, helped construct robust SEI interfacial layers improved ion LIBs. VN-based graphite‖NCM523 pouch cells achieved discharge 89.84% 20C rate room temperature. Meanwhile, cell exhibited 3C even temperature 55 °C. Notably, conductivity 1.585 mS cm-1 -50 retained 75.52% 65.12% their -40 °C °C, respectively. Wide-temperature-range have potential be applied extreme environments.
Language: Английский
Citations
8
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: Oct. 14, 2024
Rechargeable batteries with high durability over wide temperature is needed in aerospace and submarine fields. Unfortunately, Current battery technologies suffer from limited operating temperatures due to the rapid performance decay at extreme temperatures. A major challenge for wide-temperature electrolyte design lies restricting parasitic reactions elevated while improving reaction kinetics low Here, we demonstrate a temperature-adaptive by regulating dipole-dipole interactions various simultaneously address issues both subzero This approach prevents degradation endowing it ability undergo adaptive changes as varies. Such favors form solvation structure thermal stability rising transits one that salt precipitation lower ensures stably within range of ‒60 −55 °C. opens an avenue design, highlighting significance structures. High instability sluggishness electrolytes pose significant barriers towards sodium-ion batteries. authors report
Language: Английский
Citations
8
Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(23), P. 9100 - 9111
Published: Jan. 1, 2024
A novel sulfonate-based eutectic electrolyte has been designed for ultra-fast charging LMBs, benefiting from the high Li + transference number and gradient SEI layer resulting strong solvent-anion interactions due to conjugation effect.
Language: Английский
Citations
7
ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(9), P. 4386 - 4398
Published: Aug. 15, 2024
Cyclic carbonate solvents have been extensively utilized as cosolvents and/or additives in formulating electrolytes for lithium-ion batteries. However, their application often relies on empirical knowledge, lacking a universally applicable perspective to elucidate how different functional groups cyclic carbonates affect battery performance. Herein, by focusing the substituted group at α-H ethylene (EC) solvent, it is discovered that containing electron-withdrawing (e.g., −F) enable reversible Li+ (de)intercalation graphite electrodes, while those with electron-donating −CH3, −CH2CH3) may lead Li+-solvent cointercalation. Furthermore, can help achieve (de)intercalation, whereas reverse not feasible. These phenomena are elucidated through intermolecular interactions, characterized 2D 1H–19F heteronuclear Overhauser enhancement spectroscopy, revealing interactions between and -donating electrolyte solvation structure. This study offers insights into roles of or -withdrawing formulations.
Language: Английский
Citations
7
Small, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 6, 2024
Abstract Sodium‐ion batteries (SIBs) have emerged as one of today's most attractive battery technologies due to the scarcity lithium resources. Aqueous sodium‐ion (ASIBs) been extensively researched for their security, cost‐effectiveness, and eco‐friendly properties. However, aqueous electrolytes are extremely limited in practical applications because narrow electrochemical stability window (ESW) with poor low‐temperature performance. The first part this review is an in‐depth discussion reasons inferior performance electrolytes. Next, research progress extending stabilization improving using various methods such “water‐in‐salt”, eutectic, additive‐modified highlighted. Considering shortcomings existing solid electrolyte interphase (SEI) theory, recent on solvation behavior summarized based which elucidates correlation between structure performance, three upgrade by modulating introduced detail. Finally, common design ideas high‐temperature resistant that hoped help future wide temperature ranges summarized.
Language: Английский
Citations
7
ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(10), P. 4843 - 4851
Published: Sept. 13, 2024
Language: Английский
Citations
7
Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(4)
Published: Dec. 6, 2023
Abstract Electrolyte molecule engineering, especially symmetrically fluorinated molecules, is recognized as an efficacious approach for solving the insufficient stability of conventional none‐fluorinated electrolyte molecules to stabilize energy‐dense Li metal batteries (LMB). However, weak solvation and low ionic conductivity formation low‐ionic‐conductivity unstable interphase derived from electrolyte, are main challenges that limit applications improving LMB performance. Here, asymmetrically‐fluorinated design principle proposed by combining a high‐inertness structure on one side with solvation‐promoting other side, successfully integrating high strong solvation/ion‐conduction advantages while remedying their limitations at same time. The using exhibits significantly improved performances 98.97% plating/stripping Coulombic efficiency, decent cathode protection, 240 stable cycles in Li||LiNi 0.8 Co 0.1 Mn O 2 full‐cell under ultralow anode amount, uniform deposition morphology excellent fire‐retardancy overwhelm similar or symmetrically‐fluorinated structure. provides new molecule‐level understanding fluorination degree/position‐related structure‐property relationship electrolytes solves fluorination‐related dilemma achieving practical high‐performance LMB.
Language: Английский
Citations
14