Role of Ether‐Based Electrolytes in Enhancing Potential of Potassium‐ion Batteries

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(21)

Published: March 5, 2024

Abstract Potassium‐ion batteries are a promising advancement in secondary batteries, offering the potential to surpass even sodium‐ion replacing lithium‐ion batteries. Although technology has for high energy density, unresolved technical difficulties pose challenge. Fortunately, progress is made improving electrode materials, with studies demonstrating that controlling fundamental cause of electrolyte degradation can significantly enhance performance potassium‐ion However, ability ether‐based electrolytes improve battery overlooked despite their inherent characteristics. This work explores role and principles enhancing highlighting various controversies prospects this area arising from insufficient research.

Language: Английский

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Nonflammable Phosphate‐Based Electrolyte for Safe and Stable Potassium Batteries Enabled by Optimized Solvation Effect

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(29)

Published: May 6, 2024

Abstract Current potassium‐ion batteries (PIBs) are limited in safety and lifetime owing to the lack of suitable electrolyte solutions. To address these issues, herein, we report an innovative non‐flammable design strategy that leverages optimal moderate solvation phosphate‐based solvent which strikes a balance between capability salt dissociation ability, leading superior electrochemical performance. The formulated simultaneously exhibits advantages low concentration (only 0.6 M), viscosity, high ionic conductivity, oxidative stability, safety. Our also promotes formation self‐limiting inorganic‐rich interphases at anode surface, alongside robust cathode‐electrolyte interphase on iron‐based Prussian blue analogues, mitigating electrode/electrolyte side reactions preventing Fe dissolution. Notably, PIBs employing our exhibit exceptional durability, with 80 % capacity retention after 2,000 cycles high‐voltage 4.2 V coin cell. Impressively, larger scale pouch cell, it maintains over 81 its initial 1,400 1 C‐rate average Coulombic efficiency 99.6 %. This work represents significant advancement toward realization safe, sustainable, high‐performance PIBs.

Language: Английский

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Rational design of FeF₂‐based cathode to realize high‐performance potassium storage

Interdisciplinary materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 29, 2024

Abstract The poor electronic conductivity of conversion‐type materials (CMs) and the dissolution/diffusion loss transition metal (TM) ions in electrodes seriously hinder practical applications potassium ion batteries. Simply optimizing electrode or designing components is no longer effective improving performance CMs. Binders, as one components, play a vital role electrochemical Here we rationally designed FeF 2 for first time by with introduction carbon nanotubes (CNTs) combined sodium alginate (SA) binder based on strong interactions. We show that @CNTs‐SA cathode does not suffer from TM dissolution delivers high capacity 184.7 mAh g −1 at 10 mA . Moreover, 99.2 after 100 cycles , which twofold increase compared to @CNTs‐PVDF. After calculating average decay rate per cycle them, find about one‐third lower than Therefore, SA can be broadly used comprising several CMs, providing meaningful insights into mechanisms lead their improved performances.

Language: Английский

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Unveiling the Synergy of Architecture and Anion Vacancy on Bi₂Te_3–x@NPCNFs for Fast and Stable Potassium Ion Storage

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(11), P. 13858 - 13868

Published: March 5, 2024

Large volume strain and slow kinetics are the main obstacles to application of high-specific-capacity alloy-type metal tellurides in potassium-ion storage systems. Herein, Bi2Te3-x nanocrystals with abundant Te-vacancies embedded nitrogen-doped porous carbon nanofibers (Bi2Te3-x@NPCNFs) proposed address these challenges. In particular, a hierarchical fiber structure can be achieved by polyvinylpyrrolidone-etching method is conducive increasing Te-vacancy concentration. The unique together defect engineering modulates potassium mechanism Bi2Te3, suppresses structural distortion, accelerates K+ diffusion capacity. meticulously designed Bi2Te3-x@NPCNFs electrode exhibits ultrastable cycling stability (over 3500 stable cycles at 1.0 A g-1 capacity degradation only 0.01% per cycle) outstanding rate capability (109.5 mAh 2.0 g-1). Furthermore, systematic ex situ characterization confirms that undergoes an "intercalation-conversion-step alloying" for storage. Kinetic analysis density functional theory calculations reveal excellent pseudocapacitive performance, attractive adsorption, fast ability electrode, which essential Impressively, assembled Bi2Te3-x@NPCNFs//activated-carbon hybrid capacitors achieve considerable energy/power (energy up 112 Wh kg-1 power 1000 W kg-1) (1600 10.0 g-1), indicating their potential practical applications.

Language: Английский

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A crown-ether-enabled eutectic electrolyte for ultra-high temperature lithium metal batteries

Energy storage materials, Journal Year: 2024, Volume and Issue: 67, P. 103285 - 103285

Published: Feb. 20, 2024

Language: Английский

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