Non-flammable solvent-free liquid polymer electrolyte for lithium metal batteries

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Авг. 1, 2023

As a replacement for highly flammable and volatile organic liquid electrolyte, solid polymer electrolyte shows attractive practical prospect in high-energy lithium metal batteries. However, unsatisfied interface performance ionic conductivities are two critical challenges. A common strategy involves introducing solvents or plasticizers, but this violates the original intention of security design. Here, an concept called without any small molecular is proposed safe high-performance batteries, based on design room-temperature liquid-state brush-like as sole solvent salts. This non-flammable exhibits high conductivity (1.09 [Formula: see text] 10

Язык: Английский

---

Low Concentration Electrolyte Enabling Cryogenic Lithium–Sulfur Batteries

Advanced Functional Materials, Год журнала: 2022, Номер 32(44)

Опубликована: Авг. 26, 2022

Abstract Lithium–sulfur chemistry suffers from poor conversion reaction kinetics, causing low‐capacity utilization of sulfur cathodes, particularly at cryogenic temperatures. Herein, based on low‐cost and abundant commercial particles directly, a low concentration electrolyte (LCE, 0.1 m ) is employed to accelerate lithium–sulfur temperatures, demonstrating broad applicability this approach. Compared conventional (1.0 electrolytes, the proposed LCE successfully enhances kinetics Li 2 S 4 restrains shuttle effects polysulfides, resulting in higher capacity utilizations more stable cycle performance 0 −20 °C. Further interfacial analyses cycled electrodes reveal that hybrid surface layer dominated by organic species as well some favorable inorganics constructed LCE, smaller resistance. In situ EIS measurements °C CV tests main differences electrode 1 further explaining working mechanism two electrolytes. These findings elucidate roles LCEs realizing faster for batteries provide simple, low‐cost, widely applicable pathway achieving high‐performance under extreme conditions.

Язык: Английский

---

Reconstruction of LiF-rich interphases through an anti-freezing electrolyte for ultralow-temperature LiCoO₂ batteries

Energy & Environmental Science, Год журнала: 2022, Номер 16(3), С. 1024 - 1034

Опубликована: Ноя. 11, 2022

With iso-butyl formate (IF) as anti-freezing agent, a fluorine–sulfur electrolyte is designed to achieve low coordination number, high desolvation energy and stable LiF-rich interphase, enables the operation of an electric fan at −70 °C.

Язык: Английский

---

40 Years of Low‐Temperature Electrolytes for Rechargeable Lithium Batteries

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(37)

Опубликована: Май 15, 2023

Rechargeable lithium batteries are one of the most appropriate energy storage systems in our electrified society, as virtually all portable electronic devices and electric vehicles today rely on chemical stored them. However, sub-zero Celsius operation, especially below -20 °C, remains a huge challenge for greatly limits their application extreme environments. Slow Li+ diffusion charge transfer kinetics have been identified two main origins poor performance RLBs under low-temperature conditions, both strongly associated with liquid electrolyte that governs bulk interfacial ion transport. In this review, we first analyze kinetic behavior failure mechanism from an standpoint. We next trace history electrolytes past 40 years (1983-2022), followed by comprehensive summary research progress well introducing state-of-the-art characterization computational methods revealing underlying mechanisms. Finally, provide some perspectives future particular emphasis analysis practical application.

Язык: Английский

---

Strong Solvent and Dual Lithium Salts Enable Fast-Charging Lithium-Ion Batteries Operating from −78 to 60 °C

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(40), С. 22184 - 22193

Опубликована: Сен. 28, 2023

Current lithium-ion batteries degrade under high rates and low temperatures due to the use of carbonate electrolytes with restricted Li+ conduction sluggish desolvation. Herein, a strong solvent dual lithium salts surmounts thermodynamic limitations by regulating interactions among ions, anions, solvents at molecular level. Highly dissociated bis(fluorosulfonyl)imide (LiFSI) in dimethyl sulfite (DMS) favorable dielectric constant melting point ensures rapid while affinity between difluoro(oxalato)borate anions (DFOB-) ions guarantees smooth desolvation within wide temperature range. In meantime, ultrathin self-limited electrode/electrolyte interface electric double layer induced DFOB- result enhanced electrode compatibility. The as-formulated electrolyte enables stable cycles currents (41.3 mA cm-2) range from -78 60 °C. 1 Ah graphite||LiCoO2 (2 mAh pouch cell achieves 80% reversible capacity 2 C rate -20 °C 86% 0.1 -50 This work sheds new light on design further facilitates development high-performance operating extreme conditions.

Язык: Английский

---

Critical Review of Fluorinated Electrolytes for High‐Performance Lithium Metal Batteries

Advanced Functional Materials, Год журнала: 2023, Номер 33(32)

Опубликована: Апрель 27, 2023

Abstract Lithium metal batteries (LMBs), due to their ultra‐high energy density, are attracting tremendous attentions. However, commercial application is severely impeded by poor safety and unsatisfactory cycling stability, which induced lithium dendrites, side reactions, inferior anodic stability. Electrolytes, as the indispensable necessary components in batteries, play a crucial role regulating electrochemical performance of LMBs. Recently, fluorinated electrolytes widely investigated high‐performance Thus, design strategies thoroughly summarized, including salts, solvents, additives LMBs, insights suppressing improving stability Finally, an outlook with several challenges will be proposed for novel electrolytes.

Язык: Английский

---

Bifunctional Interphase with Target‐Distributed Desolvation Sites and Directionally Depositional Ion Flux for Sustainable Zinc Anode

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(25)

Опубликована: Апрель 18, 2023

Aqueous zinc batteries (AZBs) feature high safety and low cost, but intricate anodic side reactions dendrite growth severely restrict their commercialization. Herein, ethylenediaminetetraacetic acid (EDTA) grafted metal organic framework (MOF-E) is proposed as a dually-functional interphase for sustainable Zn anode. Specifically, the target-distributed EDTA serves an ion-trapped tentacle to accelerate desolvation ionic transport by powerful chemical coordination, while MOFs offer suitable channels induce oriented deposition. As result, MOF-E fundamentally suppresses guides horizontally arranged deposition with (002) preferred orientations. The Zn|MOF-E@Cu cell exhibits markedly improved Coulombic efficiency of 99.7 % over 2500 cycles, MOF-E@Zn|KVOH (KV12 O30-y ⋅ nH2 O) yields steady circulation 5000 [email protected] at 8 A g-1 .

Язык: Английский

---

Wide-temperature-range sodium-metal batteries: from fundamentals and obstacles to optimization

Energy & Environmental Science, Год журнала: 2023, Номер 16(11), С. 4759 - 4811

Опубликована: Янв. 1, 2023

This review comprehensively summarizes the operation fundamentals of SMBs in different environments and proposes various targeted optimization strategies.

Язык: Английский

---

A Multifunctional Electrolyte Additive With Solvation Structure Regulation and Electrode/Electrolyte Interface Manipulation Enabling High‐Performance Li‐Ion Batteries in Wide Temperature Range

Advanced Energy Materials, Год журнала: 2023, Номер 13(16)

Опубликована: Март 11, 2023

Abstract Improving the tolerance of Li‐ion batteries (LIBs) to extreme temperatures and climates worldwide is vital their global uptake. However, LIBs call for more strict requirements key components when operated in a wide temperature range, especially synchronously desirable interfacial kinetics thermal stability. Here, novel multifunctional electrolyte additive, N ‐tert‐butyl‐2‐thiophenesulfonamide (NTSA), fabricate stable under wide‐temperature conditions, reported. The solvation structure regulated involves less coordinated solvents (particularly fluoroethylene carbonate), leading superior Li + transportation. effective NTSA additive preferentially decomposed form uniform electrode/electrolyte interface with abundant multiphase inorganic LiF, 3 N, LiS species simultaneously on cathode anode surface. resulting inorganic‐rich can not only boost transfer at low but also protect active material enhance stability LIB devices high temperatures. By adopting NTSA‐containing electrolyte, LiCoO 2 ||ω‐Li V O 5 be stably cycled range between −30 °C 80 °C, delivering capacity ≈100.1 mAh g −1 (0.2 A ) −20 retention 94.5% after 200 cycles (0.5 55 °C.

Язык: Английский

---

Inhibiting gas generation to achieve ultralong-lifespan lithium-ion batteries at low temperatures

Matter, Год журнала: 2023, Номер 6(7), С. 2274 - 2292

Опубликована: Май 10, 2023

Язык: Английский

---