Aggregate‐Dominated Dilute Electrolytes with Low‐Temperature‐Resistant Ion‐Conducting Channels for Highly Reversible Na Plating/Stripping

Advanced Materials, Год журнала: 2024, Номер 36(41)

Опубликована: Авг. 13, 2024

Abstract Developing rechargeable batteries with high power delivery at low temperatures (LT) below 0 °C is significant for cold‐climate applications. Initial anode‐free sodium metal (AFSMBs) promise LT performances because of the de‐solvation energy and smaller Stokes radius Na + , nondiffusion‐limited plating/stripping electrochemistry, maximized density. However, severe reduction in electrolyte ionic conductivity formation unstable solid interphase (SEI) hinder their practical applications LT. In this study, a 2‐methyltetrahydrofuran‐based dilute designed to concurrently achieve an anion‐coordinated solvation structure impressive 3.58 mS cm −1 −40 °C. The dominant aggregate solvates enable highly efficient LT‐resistant hopping channels electrolyte. Moreover, methyl‐regulated electronic 2‐methyltetrahydrofuran induces gradient decomposition toward inorganic‐organic bilayer SEI mobility, composition homogeneity, mechanical robustness. As such, record‐high Coulombic efficiency beyond 99.9% achieved even as‐constructed AFSMBs sustain 300 cycles 80% capacity maintained, 0.5‐Ah level pouch cell delivers 85% over 180 −25 This study affords new insights into formulation fast conduction superior reversibility ultralow temperatures.

Язык: Английский

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Tailoring Na⁺ Solvation Environment and Electrode‐Electrolyte Interphases with Sn(OTf)₂ Additive in Non‐flammable Phosphate Electrolytes towards Safe and Efficient Na‐S Batteries

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(12)

Опубликована: Янв. 29, 2024

Room-temperature sodium-sulfur (RT Na-S) batteries are promising for low-cost and large-scale energy storage applications. However, these plagued by safety concerns due to the highly flammable nature of conventional electrolytes. Although non-flammable electrolytes eliminate risk fire, they often result in compromised battery performance poor compatibility with sodium metal anode sulfur cathode. Herein, we develop an additive tin trifluoromethanesulfonate (Sn(OTf)

Язык: Английский

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Constructing Anion Solvation Microenvironment Toward Durable High‐Voltage Sodium‐Based Batteries

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 26, 2025

Abstract Sodium‐based rechargeable batteries are some of the most promising candidates for electric energy storage with abundant sodium reserves, particularly, sodium‐based dual‐ion (SDIBs) perform advantages in high work voltage (≈5.0 V), high‐power density, and potentially low cost. However, irreversible electrolyte decomposition co‐intercalation solvent molecules at electrode interface under a charge state blocking their development. Herein, high‐salt concentration microenvironment is created proposed by tailoring solvation structures carriers including both cations anions, which maintains highly oxidation‐resistant contact ion pairs aggregates provides conductivity. The tailored structure makes great contribution to protecting graphite cathode from oxidation, co‐intercalation, structural degradation constructing robust cathode‐electrolyte interphase standout electrochemical stability. Based on this, SDIBs achieved an excellent high‐voltage cycling stability 81% capacity retention after 10 000 cycles battery showed improved rate performance 97.4 mAh g −1 maintained 100 C. It identified that regulating anion responsible stable chemistry enhanced reaction kinetics, deep insight into compatibility design between specialized electrodes.

Язык: Английский

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Regulating Interfacial Wettability for Fast Mass Transfer in Rechargeable Metal-Based Batteries

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Фев. 26, 2025

The interfacial wettability between electrodes and electrolytes could ensure sufficient physical contact fast mass transfer at the gas-solid-liquid, solid-liquid, solid-solid interfaces, which improve reaction kinetics cycle stability of rechargeable metal-based batteries (RMBs). Herein, engineering multiphase interfaces is summarized from electrolyte electrode aspects to promote interface rate durability RMBs, illustrates revolution that taking place in this field thus provides inspiration for future developments RMBs. Specifically, review presents principle macro- microscale summarizes emerging applications concerning effect on Moreover, deep insight into development provided outlook. Therefore, not only insights but also offers strategic guidance modification optimization toward stable electrode-electrolyte

Язык: Английский

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Temperature-Robust Solvation Enabled by Solvent Interactions for Low-Temperature Sodium Metal Batteries

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Янв. 28, 2025

The broad temperature adaptability associated with the desolvation process remains a formidable challenge for organic electrolytes in rechargeable metal batteries, especially under low-temperature (LT) conditions. Although traditional approach involves utilizing high degree of anion participation solvation structure, known as weakly (WSEs), structure these is highly susceptible to fluctuations, potentially undermining their LT performance. To address this limitation, we have devised an innovative electrolyte that harnesses interplay between solvent molecules, effectively blending strong and weak solvents while incorporating mostly unchanged by variations. Remarkably, competitive coordination two molecules introduces local disorder, which not only boosts ionic conductivity but also prevents salt precipitation solidification. Therefore, has 3.12 mS cm-1 at -40 °C. Na3V2(PO4)3||Na cells demonstrated reversible capacity 95.9 mAh g-1 °C, 87.6% room temperature, well stable cycling 3400 cycles retention 98.2% -20 °C 5 C 600 96.1% 1 C. This study provides new perspective on designing regulating temperature-robust structures.

Язык: Английский

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