Hydrogen-bond regulation in organic/aqueous hybrid electrolyte for safe and high-voltage K-ion batteries

Energy & Environmental Science, Год журнала: 2024, Номер 17(3), С. 1255 - 1265

Опубликована: Янв. 1, 2024

Hydrogen-bond regulating organic/aqueous hybrid electrolyte with immobilized H 2 O provides new insights into realizing high-voltage aqueous batteries without compromising safety.

Язык: Английский

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Rational Regulation of High-Voltage Stability in Potassium Layered Oxide Cathodes

ACS Nano, Год журнала: 2024, Номер 18(20), С. 13415 - 13427

Опубликована: Май 10, 2024

Layered oxide cathode materials may undergo irreversible oxygen loss and severe phase transitions during high voltage cycling be susceptible to transition metal dissolution, adversely affecting their electrochemical performance. Here, address these challenges, we propose synergistic doping of nonmetallic elements in situ diffusion as potential solution strategies. Among them, the distribution element fluorine within material can regulated by boron, thereby suppressing manganese dissolution through surface enrichment fluorine. Furthermore, from into bulk after charging reduces energy barrier potassium ion while effectively inhibiting under voltage. The modified K0.5Mn0.83Mg0.1Ti0.05B0.02F0.1O1.9 layered exhibits a capacity 147 mAh g–1 at 50 mA long cycle life 2200 cycles 500 g–1. This work demonstrates efficacy provides valuable insights for optimizing rechargeable battery materials.

Язык: Английский

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Cosolvent electrolyte chemistries for high-voltage potassium-ion battery

National Science Review, Год журнала: 2024, Номер 11(11)

Опубликована: Окт. 15, 2024

ABSTRACT The poor oxidation resistance of traditional electrolytes has hampered the development high-voltage potassium-ion battery technology. Here, we present a cosolvent electrolyte design strategy to overcome limitations chemistries. breaks dissolution limitation salt through ion–dipole interactions, significantly enlarging anion-rich solvation clusters, as verified by insitu synchrotron-based wide-angle X-ray scattering experiments. Furthermore, large clusters also facilitate formation an effective electrode–electrolyte interphase, thereby enhancing compatibility with electrodes. enables K||Prussian blue cells (2–4.5 V) operate for >700 cycles capacity retention 91.9%. Our paves new avenues batteries and beyond.

Язык: Английский

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

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(29)

Опубликована: Май 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.

Язык: Английский

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Bio-inspired carbon electrodes for metal-ion batteries

Nanoscale, Год журнала: 2024, Номер 16(12), С. 5893 - 5902

Опубликована: Янв. 1, 2024

This mini-review highlights advances in multi-dimensional carbon electrodes with bio-inspired principles for metal-ion batteries.

Язык: Английский

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Chloro‐Functionalized Ether‐Based Electrolyte for High‐Voltage and Stable Potassium‐Ion Batteries

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(23)

Опубликована: Апрель 10, 2024

Abstract Ether‐based electrolyte is beneficial to obtaining good low‐temperature performance and high ionic conductivity in potassium ion batteries. However, the dilute ether‐based electrolytes usually result ion‐solvent co‐intercalation of graphite, poor cycling stability, hard withstand voltage cathodes above 4.0 V. To address aforementioned issues, an electron‐withdrawing group (chloro‐substitution) was introduced regulate solid‐electrolyte interphase (SEI) enhance oxidative stability electrolytes. The (~0.91 M) chloro‐functionalized not only facilitates formation homogeneous dual halides‐based SEI, but also effectively suppress aluminum corrosion at voltage. Using this functionalized electrolyte, K||graphite cell exhibits a 700 cycles, K||Prussian blue (PB) (4.3 V) delivers 500 PB||graphite full‐cell reveals long 6000 cycles with average Coulombic efficiency 99.98 %. Additionally, can operate under wide temperature range from −5 °C 45 °C. This work highlights positive impact functionalization on electrochemical performance, providing bright future application for long‐lasting, wide‐temperature, PIBs beyond.

Язык: Английский

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In Situ Construction of Uniform and Elastic Solid–Electrolyte Interphase for High‐Performance Potassium Batteries

Advanced Functional Materials, Год журнала: 2024, Номер 34(46)

Опубликована: Июнь 22, 2024

Abstract Solid electrolyte interphase (SEI) plays a crucial role in battery. This study leverages the assistance of weak interactions to construct uniform and elastic SEI for potassium batteries. The caffeic acid phenethyl ester (CAPE) is introduced into electrolyte, between CAPE anodes enable contact electrons preferentially during cycling. unsaturated carbon═carbon double bonds molecules receive undergo polymerization reactions on anode surface, forming SEI. Such exhibits good uniformity excellent mechanical elasticity, enabling adapt well huge volume changes maintain structural stability As result, graphite over 1500 stable cycles at current density 100 mA g −1 . metal full battery based Prussian blue (PB) cathode 5700 times 1000 In addition, pouch potassium‐ion PB also shows electrochemical performance, which operates stably 600 without significant attenuation capacity 200 , showing potential practical value.

Язык: Английский

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Super‐Ionic Conductor Soft Filler Promotes Li⁺ Transport in Integrated Cathode–Electrolyte for Solid‐State Battery at Room Temperature

Advanced Materials, Год журнала: 2024, Номер 36(27)

Опубликована: Апрель 7, 2024

Abstract Composite polymer solid electrolytes (CPEs), possessing good rigid flexible, are expected to be used in solid‐state lithium‐metal batteries. The integration of fillers into matrices emerges as a dominant strategy improve Li + transport and form ‐conducting electrode–electrolyte interface. However, challenges arise traditional fillers: 1) inorganic fillers, characterized by high interfacial energy, induce agglomeration; 2) organic with elevated crystallinity, impede intrinsic ionic conductivity, both severely hindering migration. Here, concept super‐ionic conductor soft filler, utilizing conductivity nanocellulose (Li‐NC) model, is introduced which exhibits conductivity. Li‐NC anchors anions, enhances speed, assists the cathode–electrolyte electrodes for room temperature tough dual‐channel electrolyte (TDCT) polyvinylidene fluoride (PVDF) demonstrates transfer number (0.79) due synergistic coordination mechanism transport. Integrated electrodes’ design enables stable performance LiNi 0.5 Co 0.2 Mn 0.3 O 2 |Li cells, 720 cycles at C, 88.8% capacity retention. Furthermore, lifespan Li|TDCT|Li cells over 4000 h Li‐rich 1.2 Ni 0.13 0.54 excellent performance, proving practical application potential filler energy density batteries temperature.

Язык: Английский

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Ether-Based High-Voltage Lithium Metal Batteries: The Road to Commercialization

ACS Nano, Год журнала: 2024, Номер 18(16), С. 10726 - 10737

Опубликована: Апрель 11, 2024

Ether-based high-voltage lithium metal batteries (HV-LMBs) are drawing growing interest due to their high compatibility with the Li anode. However, commercialization of ether-based HV-LMBs still faces many challenges, including short cycle life, limited safety, and complex failure mechanisms. In this Review, we discuss recent progress achieved in electrolytes for propose a systematic design principle electrolyte based on three important parameters: electrochemical performance, industrial scalability. Finally, summarize challenges commercial application suggest roadmap future development.

Язык: Английский

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Restructuring Electrolyte Solvation by a Partially and Weakly Solvating Cosolvent toward High-Performance Potassium-Ion Batteries

ACS Nano, Год журнала: 2024, Номер 18(19), С. 12512 - 12523

Опубликована: Май 3, 2024

Ether-based electrolytes are among the most important for potassium-ion batteries (PIBs) due to their low polarization voltage and notable compatibility with potassium metal. However, development is hindered by strong binding between K+ ether solvents, leading [K+–solvent] cointercalation on graphite anodes. Herein, we propose a partially weakly solvating electrolyte (PWSE) wherein local solvation environment of conventional 1,2-dimethoxyethane (DME)-based efficiently reconfigured diethoxy methane (DEM) cosolvent. For PWSE in particular, DEM participates shell weakens chelation DME, facilitating desolvation suppressing behavior. Notably, structure DME-based transformed into more cation–anion–cluster-dominated structure, consequently promoting thin stable solid–electrolyte interphase (SEI) generation. Benefiting from optimized SEI generation, enables electrode reversible (de)intercalation (for over 1000 cycles) K plating/stripping (the K||Cu cell an average Coulombic efficiency 98.72% 400 dendrite-free properties K||K operates 1800 h). We demonstrate that rational design provides approach tailoring toward PIBs.

Язык: Английский

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