Structural regulation chemistry of lithium ion solvation for lithium batteries

EcoMat, Journal Year: 2022, Volume and Issue: 4(4)

Published: March 22, 2022

Abstract The performance of Li batteries is influenced by the + solvation structure, which can be precisely adjusted components electrolytes. In this review, we overview strategies for optimizing electrolyte structures from three different perspectives, including anion regulation, binding energy and additive regulation. These optimize composition electrode‐electrolyte interface, enhance anti‐oxidative stability electrolytes as well regulate behaviors anions, solvents, during cycling process. Moreover, also provide our insights into these aspects present perspectives on high‐performance batteries. image

Language: Английский

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Discerning Roles of Interfacial Model and Solid Electrolyte Interphase Layer for Stabilizing Antimony Anode in Lithium-Ion Batteries

ACS Materials Letters, Journal Year: 2022, Volume and Issue: 4(11), P. 2233 - 2243

Published: Oct. 17, 2022

Electrolyte solvation chemistry has attracted great attention since the recent discovery of its effect on performances metal-ion batteries. However, it is challenging to discern decisive influence from well-known solid electrolyte interphase (SEI) layer. This issue becomes more complex upon introducing additives into electrolyte, as key role in forming SEI layer or changing structure also become hard be discerned. Herein, we design a new dimethyl ether-based and then unravel effects determining electrode performances, such antimony (Sb) anode promising example for lithium-ion batteries (LIBs). We find that both unique structure-derived interfacial model are necessary stabilize Sb anode. The influences components, particularly lithium difluoro(oxalato)borate additive, were elucidated first time by dynamic molecular behaviors ranging structure, model, microstructure SEI. Finally, extremely high performance with capacity 668 mAh g–1, high-rate over 5 A long cycle life 100 cycles obtained, which superior previously reported. work provides comprehensive guideline designing electrolytes via synergetic approach aspects.

Language: Английский

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Advances in Fine Structure Optimizations of Layered Transition‐Metal Oxide Cathodes for Potassium‐Ion Batteries

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 13(2)

Published: Nov. 20, 2022

Abstract Potassium‐ion batteries (PIBs) have attracted significant research interest in the context of driving advancement grid energy storage due to K's elemental abundance and high theoretical output voltage. The main challenge facing PIBs is find suitable cathode materials with fast transport kinetics stable framework structures intercalate/de‐intercalate large‐size K + . Among these candidates, transition‐metal layered oxides are excellent potential been extensively exploited their skeleton structure, simple synthetic chemistry, working potential. Herein, current status prospects oxide cathodes summarized, especially focussing on fine structure optimization engineering mechanism. In addition, a brief overview advanced characterization techniques for introduced detail. Finally, directions hot spots new‐type also predicted, order guide future development PIBs.

Language: Английский

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A High‐Energy and Safe Lithium Battery Enabled by Solid‐State Redox Chemistry in a Fireproof Gel Electrolyte

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(28)

Published: May 7, 2022

Recent years have witnessed thriving efforts in pursuing high-energy batteries at an unaffordable cost of safety. Herein, a and safe quasi-solid-state lithium battery is proposed by solid-state redox chemistry polymer-based molecular Li2 S cathode fireproof gel electrolyte. This fully eliminates not only the negative effect extremely reactive Li metal oxygen species on cell safety but also damage electrode reversibility soluble intermediates. The exhibits exceptional lifetime 2000 cycles, 100% Coulombic efficiency, high capacity 830 mA h g-1 with ultralow loss 0.005-0.01% per cycle superior rate capability up to 10 C. Meanwhile, it shows stability carbonate-involving electrolyte for maximizing compatibility carbonate-efficient Si anode. optimized exerts energy over 750 W kg-1 500 cycles fast response, high-temperature adaptability, no self-discharge. A fire-retardant composite developed further strengthen intrinsic between anode, which secures remarkable against extreme abuse overheating, short circuits, mechanical air/water or even when fire.

Language: Английский

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Stabilizing High‐Nickel Cathodes with High‐Voltage Electrolytes

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 15, 2023

Abstract Electrolytes connect the two electrodes in a lithium battery by providing Li + transport channels between them. Advanced electrolytes are being explored with high‐nickel cathodes and lithium‐metal anode to meet high energy density cycle life goals, but origin of performance differences different is not fully understood. Here, mechanisms involved protecting high‐capacity, cobalt‐free cathode LiNiO 2 model high‐voltage electrolyte (HVE) delineated. The kinetic barrier posed thick surface degradation layer poor ‐ion found be major contributor fast capacity fade conventional carbonate electrolyte. In contrast, HVE reduces side reactions electrodes, leading thinner nano‐interphase comprised more beneficial species. Crucially, leads reorganization pathway involving formation nanoscale LiNi O 4 spinel phase on surface. With 3D electronic conductivity, nanolayer preserves across cathode–electrolyte interface, reaction heterogeneity electrode alleviates intergranular cracking within secondary particles, resulting superior long‐term life.

Language: Английский

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Synergistic Additives Enabling Stable Cycling of Ether Electrolyte in 4.4 V Ni‐Rich/Li Metal Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(51)

Published: Aug. 17, 2023

Abstract Ether‐based electrolytes have high ionic conductivity and good stability toward the lithium metal anode relative to carbonate‐based electrolytes, but they typically exhibit poor oxidation (<4 V vs Li + /Li). Most approaches aimed at enhancing oxidative of ether‐based such as “salt‐in‐solvent” “weakly solvating” strategies, often sacrifice their inherent advantage conductivity. Herein, this article proposes a cost‐effective synergistic additive strategy by co‐adding LiNO 3 vinylene carbonate (VC) achieve an optimized electrolyte (OEE) that simultaneously offers Li‐ion (Li ) (11.52 mS cm −1 20 °C) high‐voltage (4.4 V). VC can enter inner solvation shell electrolyte, preferentially participating in film‐forming progress electrode surface, leading formation unique organic–inorganic bilayer interfacial protective layer. This layer could effectively suppress side reactions enhance stability. As result, 4.4 Li‐LiNi 0.8 Mn 0.1 Co O 2 (NCM811) full cells assembled with OEE stable cycling performance both room temperature low temperature. work provides new approach design for batteries.

Language: Английский

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Vanadium fluorophosphates: advanced cathode materials for next-generation secondary batteries

Materials Horizons, Journal Year: 2023, Volume and Issue: 10(6), P. 1901 - 1923

Published: Jan. 1, 2023

The recent progress on vanadium fluorophosphate cathodes for sodium (potassium) ion batteries is systematically summarized, including their crystal structure, Na + /K storage mechanism, modification strategy, and electrochemical performance.

Language: Английский

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Molecular regulated polymer electrolytes for solid-state lithium metal batteries: Mechanisms and future prospects

eTransportation, Journal Year: 2023, Volume and Issue: 18, P. 100264 - 100264

Published: July 13, 2023

Language: Английский

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Conductive Li⁺ Moieties‐Rich Cathode Electrolyte Interphase with Electrolyte Additive for 4.6 V Well‐Cycled Li||LiCoO₂ Batteries

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(20)

Published: April 7, 2023

Abstract Increasing the cut‐off voltage of cathodes can improve energy density Li||LiCoO 2 batteries. However, electrolyte and cathode suffer from oxidation deterioration at high voltage, respectively, which lead to rapid battery degradation. Herein, a uniform, highly Li + conductive interphase (CEI) is constructed by using bis‐(benzenesulfonyl)imide (BBSI) as an additive stabilize batteries 4.6 with superior cycling high‐rate performance. Such CEI comprised LiF moieties (e.g., S 3 N), migration, alleviate degradation, other secondary degradation factors caused uneven local intercalation/deintercalation. As expected, 1% BBSI‐containing sustain 81.30% initial capacity after 300 cycles 0.5C, 88.27% even 500 2C/3C.

Language: Английский

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An electrolyte additive for the improved high voltage performance of LiNi_0.5Mn_1.5O₄ (LNMO) cathodes in Li-ion batteries

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(14), P. 7670 - 7678

Published: Jan. 1, 2023

High-voltage cathode materials are important for the implementation of high-energy-density Li-ion batteries. However, with increasing cut-off voltages, interfacial instabilities between electrodes and electrolyte limit their commercial development. This study addresses this issue by proposing a new additive, (3-aminopropyl)triethoxysilane (APTS). APTS stabilises interface LiNi0.5Mn1.5O4 (LNMO) in LNMO‖Li half-cells due to its multifunctional character. The amino groups facilitate formation robust protective layer. Its silane improve layer stability neutralising electrolyte's detrimental hydrogen fluoride water. Electrochemical measurements reveal that addition 0.5 wt% significantly improves long-term cycling at room temperature 55 °C. APTS-addition delivers excellent capacity retention 92% after 350 cycles 71% 300 °C (1C) contrasting much lower performances additive-free electrolyte. (3-glycidyloxypropyl)trimethoxysilane (GLYMO) which contains only siloxane group, but lacks amine displayed 73% degraded upon

Language: Английский

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