Regulating cation-solvent interactions in PVDF-based solid-state electrolyte for advanced Li metal batteries

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Poly(vinylidene fluoride) (PVDF)-based solid-state electrolytes (SSEs) have been considered promising candidates for advanced Li metal batteries due to their adequate mechanical strength and acceptable thermal stability. However, the poor compatibility between residual solvent inevitably leads fast capacity decay. Herein, we propose a multifunctional cation-anchor strategy regulate solvation chemistry in PVDF-based SSEs boost electrochemical performance of batteries. The strong interaction N,N-dimethylformamide (DMF) Zn2+ decreases participation DMF inner sheath Li+, inducing an anion-reinforced structure. unique structure facilitates formation robust LiF-rich solid electrolyte interphase layer eliminate interfacial side reactions. In addition, continuous ion-conducting network is constructed by introducing extra TFSI- anions, enabling accelerated Li+ transport. As result, corresponding Li‖Li symmetrical cells achieve stable lithium plating/stripping over 780 h, rate cycling stability Li‖LiFePO4 are significantly improved. This work highlights key role regulation

Language: Английский

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A scalable and flexible hybrid solid electrolyte based on NASICON-structure Li3Zr2Si2PO12 for high-voltage hybrid batteries

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 635, P. 236415 - 236415

Published: Feb. 18, 2025

Language: Английский

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Constructing PVDF‐Based Polymer Electrolyte for Lithium Metal Batteries by Polymer‐Induced Phase Structure Adjustment Strategy

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 18, 2025

Abstract The phase separation between solvents and polymers during the processing leads to porous structure of PVDF electrolyte, resulting in uneven distribution ion channels, accelerating growth lithium dendrites. Moreover, various crystal structures hinder migration Li + , setting obstacles for improvement conductivity. Here, an amorphous polymer system (BPE) with excellent salt affinity is introduced into electrolyte as a bridge eliminate structures. densified by utilizing properties BPE its salt, thus homogenizing channels. Furthermore, inhibited crystallization PVDF, improving conductivity electrolyte. obtained (BPLE) has high ionic (1.6 × 10 −3 S cm −1 ) transference number (0.66) at room temperature. LiFePO 4 ||Li cell assembled BPLE‐1 achieved initial capacity 149 mAh g retention rate 98% (1C, 500 cycles, RT). At current density 2C, battery specific 142 exceeds 84% after 800 cycles.

Language: Английский

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In Situ Reconstruction of the Ceramic Particle Surface Boosting High-Performance and Ultrathin Hybrid Solid-State Electrolyte

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Garnet-based solid electrolytes endow lithium-based batteries with higher safety and energy density as compared to those of conventional lithium-ion batteries. The dry process is a promising fabrication method eliminate energy-intensive drying solvent recovery steps, preventing degradation garnet-based during the production electrolytes. However, owing poor ion conduction Li2CO3 formed on ceramic particles, composite synthesized by processing normally exhibit unsatisfactory ionic conductivity. Herein, we propose an interface-reconstructing strategy in situ convert insulating into lithium salt-rich layer, which beneficial further form highly Li+ conductive eutectic bridge between particles. Based optimization, ultrathin electrolyte membrane (20 μm) exhibits excellent conductivity 5.56 × 10-4 S cm-1 at 30 °C high safety. After 500 cycles 1C rate, capacity retention rate assembled quasi-solid-state metal battery 80.2%, much better than similar work reported previously. Taken together, this facile can effectively improve electrochemical performance, facilitates mass membranes.

Language: Английский

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Recent fluorination strategies in solid electrolytes for high-voltage solid-state lithium-ion batteries

Rare Metals, Journal Year: 2025, Volume and Issue: unknown

Published: March 7, 2025

Language: Английский

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Host–Guest Inversion Engineering Induced Superionic Composite Solid Electrolytes for High-Rate Solid-State Alkali Metal Batteries

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: March 17, 2025

Abstract Composite solid electrolytes (CSEs) are promising for solid-state Li metal batteries but suffer from inferior room-temperature ionic conductivity due to sluggish ion transport and high cost expensive active ceramic fillers. Here, a host–guest inversion engineering strategy is proposed develop superionic CSEs using cost-effective SiO 2 nanoparticles as passive hosts poly(vinylidene fluoride-hexafluoropropylene) (PVH) microspheres polymer guests, forming an unprecedented “polymer guest-in-ceramic host” (i.e., PVH-in-SiO ) architecture differing the traditional “ceramic guest-in-polymer host”. The exhibits excellent Li-salt dissociation, achieving high-concentration free + . Owing low diffusion energy barriers coefficient, thermodynamically kinetically favorable migrate at /PVH interfaces. Consequently, delivers exceptional of 1.32 × 10 −3 S cm −1 25 °C (vs typically −5 –10 −4 high-cost ceramics), achieved under ultralow residual solvent content 2.9 wt% 8–15 in other CSEs). Additionally, electrochemically stable with anode various cathodes. Therefore, demonstrates high-rate cyclability LiFePO 4 |Li full cells (92.9% capacity-retention 3C after 300 cycles °C) outstanding stability high-mass-loading (9.2 mg high-voltage NCM622 (147.1 mAh g ). Furthermore, we verify versatility by fabricating Na-ion K-ion-based similarly promotions conductivity. Our offers simple, low-cost approach large-scale application beyond.

Language: Английский

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Strategically tailored polyethylene separator parameters enable cost-effective, facile, and scalable development of ultra-stable liquid and all-solid-state lithium batteries

Energy storage materials, Journal Year: 2025, Volume and Issue: unknown, P. 104191 - 104191

Published: March 1, 2025

Language: Английский

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Organic-inorganic composite electrolyte with in-situ polymerization poly(1,3-dioxolane) toward high-performance quasi-solid-state lithium metal batteries

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 120, P. 116459 - 116459

Published: April 3, 2025

Language: Английский

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Conduction of lithium ions in polymer-based electrolytes

Solid State Ionics, Journal Year: 2025, Volume and Issue: 424, P. 116858 - 116858

Published: April 8, 2025

Language: Английский

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Amide Induced Fast‐Ion Transport in Bulk Phases and Interfaces for Polymer‐In‐Ceramic Electrolytes

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 21, 2025

Abstract Polymer in ceramic (PIC) electrolytes have garnered significant attention due to their advantages over individual inorganic and organic polymer electrolytes. However, the slow movement of Li + on chain segments “hard contact” among particles with irregular surface severely impede smooth transport lithium ions. The bipolar character N‐methyl‐2,2,2‐trifluoroacetamide (MFA) makes it significantly enriched surface, accordingly converting between into a “soft mode, opening up ion multiple phases. structure fluorine substitution further disperses negative charge density carbonyl group from MFA accelerates ligand removal . Accordingly, interconnected PIC electrolyte (MPIC) exhibits an ionic conductivity 1.13 mS cm −1 transfer number 0.81 at 30 °C, also delivering remarkable critical current 2.6 mA −2 corresponding full cell can achieve stable cycling high 1.2 even −20 still retains 94% its capacity after 100 cycles, overcoming temperature limitations. This work paves way for designing commercial viability by interphase regulation.

Language: Английский

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