Encapsulation of Sn Sub‐Nanoclusters in Multichannel Carbon Matrix for High‐Performance Potassium‐Ion Batteries

Angewandte Chemie, Год журнала: 2024, Номер 136(45)

Опубликована: Авг. 7, 2024

Abstract Sub‐nanoclusters with ultra‐small particle sizes are particularly significant to create advanced energy storage materials. Herein, Sn sub‐nanoclusters encapsulated in nitrogen‐doped multichannel carbon matrix (denoted as Sn‐SCs@MCNF) designed by a facile and controllable route flexible anode for high‐performance potassium ion batteries (PIBs). The uniformly dispersed can be precisely identified, which ensure us clarify the size influence on electrochemical performance. sub‐nanoscale effect of Sn‐SCs@MCNF restrains electrode pulverization enhances K + diffusion kinetics, leading superior cycling stability rate As freestanding PIBs, manifests properties, such exceptional ( around 331 mAh g −1 after 150 cycles at 100 mA ) capability. Especially, Sn‐SCs@MCNF||KFe[Fe(CN) 6 ] full cell demonstrates impressive reversible capacity 167 0.4 A even 200 cycles. Theoretical calculations that ultrafine beneficial electron transfer contribute lower barriers intermediates, thereby resulting promising Comprehensive investigation intrinsic process is revealed situ analysis. This work provides vital guidance design functional materials energy‐storage devices.

Язык: Английский

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Nucleophilic cleavage of C–F bonds by Brønsted base for rapid synthesis of fluorophosphate materials

National Science Review, Год журнала: 2025, Номер 12(3)

Опубликована: Янв. 20, 2025

Fluorochemicals are a rapidly expanding class of materials used in variety fields including pharmaceuticals, metallurgy, agrochemicals, refrigerants, and particular, alkali metal ion batteries. However, achieving one-step synthesis pure fluorophosphate compounds well-controlled manner remains formidable challenge due to the volatilization fluorine during heat treatment process. One feasible method is cleave C-F bond polytetrafluoroethylene (PTFE) create fluorine-rich atmosphere strongly reducing environment. inert nature PTFE presents significant obstacle, as it strongest single organic compounds. To address this predicament, we propose fluorine-compensating strategy that involves cleavage bonds by nucleophilic SN2-type reactions Brønsted base (ammonia) enabling compensation. The decomposed products (NH2· C·) also result formation micropores (via NH3 escape) in-situ carbon coating C· polymerization). resultant cathode delivers superior potassium storage capability high rate performance capacity retention. This contribution not only overcomes obstacles associated with fluororesin, but represents step forward development fluorine-containing

Язык: Английский

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High-Rate SiO Lithium-Ion Battery Anode Enabled by Rationally Interfacial Hybrid Encapsulation Engineering

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(5), С. 5915 - 5925

Опубликована: Янв. 26, 2024

The development of a high-rate SiO lithium-ion battery anode is seriously limited by its low intrinsic conductivity, sluggish interfacial charge transfer (ICT), and unstable dynamic interface. To tackle the above issues, encapsulation engineering for effectively regulating reaction thus realizing stable solid electrolyte interphase significantly important. Hybrid coating, which aims to enhance coupled e-/Li+ transport via employment dual layers, has emerged as promising strategy. Herein, we construct hybrid MXene-graphene oxide (GO) coating layer on microparticles. In design, Ti3C2Tx MXene acts "bridge", forms close covalent connection with GO through Ti-O-Si Ti-O-C bonds, respectively, greatly reducing ICT resistance. Moreover, rich surface groups (e.g., -OH, -F) outer layers an intertwined porous framework synergistically enable pseudocapacitance dominated behavior, beneficial fast storage. Accordingly, as-made Si@MXene@GO exhibits considerably reinforced storage performance in terms superior rate (1175.9 mA h g-1 at 5 A g-1) long cycling stability (1087.6 capacity retained after 1000 cycles 2.0 g-1). In-depth chemical composition analysis further reveals that inorganically gradient distribution LiF Li2O formed electrolyte/anode interface ensures mechanical during repeated cycles. This work paves feasible way maximizing potential anodes toward fast-charging batteries.

Язык: Английский

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Novel high-voltage cathode for aqueous zinc ion batteries: Porous K0.5VOPO4·1.5H2O with reversible solid-solution intercalation and conversion storage mechanism

Journal of Energy Chemistry, Год журнала: 2024, Номер 93, С. 71 - 78

Опубликована: Янв. 30, 2024

Язык: Английский

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Fluorine Doping Modulating Pore Structure and Adsorption Capability of Carbon Matrix Boosting Potassium Storage Performance of Red Phosphorus Anode

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 2, 2024

Abstract The application of alloying‐typed red phosphorus (red P) anode in potassium‐ion batteries (KIBs) with ultra‐high theoretical capacity is hindered by the limited and fast decay due to poor electronic conductivity huge volume change. Herein, a facile efficient strategy fluorine (F) doping innovatively developed modulate pore structure carbon matrix (F‐CNS) encapsulate P enhanced potassium storage capability. Theoretical calculations reveal that F induces additional defects within layer, which facilitates 4 molecules embedding into F‐doping‐induced micropores, enhances adsorption ability toward K atoms molecules, improves electrochemical kinetics assisted more charge transfer obtained from electron density difference, thus enabling robust capability for such unique Red P@F‐CNS anode. Accordingly, demonstrates outstanding cycling stability (90% retention after 800 cycles at 2A g −1 ), full cell (Red P@F‐CNS//KFeHCF) exhibits exceptional long‐term performance (129 mAh 2500 5 A only 0.014% per cycle). In situ characterizations confirm superior structural integrity carbon‐based matrix. This study offers rational design principle engineering high‐performance carbon‐supported anodes KIBs.

Язык: Английский

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