Carbonaceous Anode Materials for Non-aqueous Sodium- and Potassium-Ion Hybrid Capacitors

ACS Energy Letters, Год журнала: 2021, Номер 6(11), С. 4127 - 4154

Опубликована: Ноя. 1, 2021

Sodium- and potassium-ion (Na-/K-ion) hybrid capacitors are promising electrochemical energy storage systems that more cost-effective than corresponding lithium-based alternatives. Their configuration integrates a battery-type anode capacitor-type cathode affords high density, power good cycling stability. However, the primary issue encountered in Na-/K-ion is lack of reliable anodes because sluggish reaction kinetics large Na-/K-ions. In recent years, significant advancements have been achieved carbonaceous their feasibility, natural abundance, low cost, non-toxicity. This review encompasses fundamental principles provides insights into intimate structure–performance relationship anodes. The existing challenges alternative strategies for improving performance emphasized. Finally, future prospects possible directions further presented.

Язык: Английский

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Recent trends in supercapacitor-battery hybrid energy storage devices based on carbon materials

Journal of Energy Storage, Год журнала: 2022, Номер 52, С. 104938 - 104938

Опубликована: Май 30, 2022

Язык: Английский

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Unraveling the Effect of Intrinsic Carbon Defects on Potassium Storage Performance

Advanced Functional Materials, Год журнала: 2022, Номер 32(48)

Опубликована: Сен. 28, 2022

Abstract Defects engineering is an attractive strategy to improve the potassium storage performance of carbon anodes. The current studies mainly focus on introduction external defects via heteroatom doping, however, exploration effect intrinsic caused by loss atoms or distortion in crystal lattice still lacking date. Hence, a series materials with different defect levels are developed soft‐template assisted method. It found that content synergistically determined application template and pyrolysis temperature, higher more likely expose enormous edge active sites. This greatly promotes K‐adsorption during surface‐induced capacitive process, therefore strong positive correlation between capacity/capacity retention confirmed. As result, electrode maximum realizes good capacity rate capability long cycle lifespan (225.9 mAh g −1 at 2 A over 2000 cycles). study offers insight into role performance.

Язык: Английский

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Accordion‐Like Carbon with High Nitrogen Doping for Fast and Stable K Ion Storage

Advanced Energy Materials, Год журнала: 2021, Номер 11(41)

Опубликована: Сен. 24, 2021

Abstract Potassium ion battery (PIB) is a potential candidate for future large‐scale energy storage. A key challenge that the (de)potassiation stability of graphitic carbon anodes hampered by limited (002) interlayer spacing. Amorphous with hierarchical structure can buffer volume change during repeated and enable stable cycling. Herein, direct pyrolysis approach demonstrated to synthesize highly nitrogen‐doped (26.7 at.%) accordion‐like anode composed thin nanosheets turbostratic crystalline structure. The endowed self‐assembly process carbonization. accordion enables high reversible capacity 346 mAh g −1 superior cycling stability. This work constitutes general synthesis methodology be used prepare advanced PIBs.

Язык: Английский

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Coupling of Metallic VSe₂ and Conductive Polypyrrole for Boosted Sodium-Ion Storage by Reinforced Conductivity Within and Outside

ACS Nano, Год журнала: 2022, Номер 16(5), С. 7772 - 7782

Опубликована: Апрель 19, 2022

Although transitional metal dichalcogenides have been regarded as appealing electrodes for sodium/potassium-ion batteries (SIBs/PIBs) owing to their high theoretical capacity, it is a key challenge realize dichalcogenide anodes with long-period cycling performance and high-rate capability because of poor conductivity large volumetric change. Herein, polypyrrole-encapsulated VSe2 nanoplates (VSe2@PPy) were prepared by the selenization VOOH hollow nanospheres subsequent in situ polymerization coating pyrrole. Benefiting from inherent metallicity VSe2, improvement structural protection provided PPy layer, VSe2@PPy exhibited enhanced sodium/potassium-storage performances, delivering superior rate capacity 260.0 mA h g-1 at 10 A SIBs 148.6 5 PIBs, well revealing an ultrastability 324.6 after 2800 cycles 4 SIBs. Moreover, insertion conversion mechanisms intermediates Na0.6VSe2, NaVSe2, VSe elucidated situ/ex X-ray diffraction combined ex transmission electron microscopy observation potentio-electrochemical impedance spectroscopy during sodiation desodiation processes. Density functional theory calculations show that strong coupling between not only causes stronger total density states built-in electric field, leading increased electrical conductivity, but also effectively decreases ion diffusion barrier.

Язык: Английский

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Defect Engineering of Carbons for Energy Conversion and Storage Applications

Energy & environment materials, Год журнала: 2022, Номер 6(3)

Опубликована: Апрель 13, 2022

Sustainable energy conversion and storage technologies are a vital prerequisite for neutral future carbon. To this end, carbon materials with attractive features, such as tunable pore architecture, good electrical conductivity, outstanding physicochemical stability, abundant resource, low cost, have used promising electrode storage. Defect engineering could modulate the structures of materials, thereby affecting their electronic properties. The presence defects on carbons may lead to asymmetric charge distribution, change in geometrical configuration, distortion structure that result unexpected electrochemical performances. In review, recent advances were examined terms types, regulation strategies, fine characterization means defects. applications supercapacitors, rechargeable batteries, electrocatalysis also discussed. perspectives toward development defect proposed. all, novel insights related improvement high‐performance provided.

Язык: Английский

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Designing carbon anodes for advanced potassium-ion batteries: Materials, modifications, and mechanisms

Advanced Powder Materials, Год журнала: 2022, Номер 1(4), С. 100057 - 100057

Опубликована: Май 10, 2022

Recently, the limited abundance and uneven geographical distribution of Li resources seriously hamper growing demand for lithium-based energy storage devices. In this regard, potassium-ion batteries (KIBs) sharing similar “rocking chair” working principles with lithium-ion have started to attract increasing attention due their high density abundant potassium resources. Carbon material is considered show great potential using as high-performance anode in KIBs. However, it still a challenge simultaneously achieve satisfactory specific gravimetric volumetric capacities, initial Coulombic efficiency, superior rate performance, excellent cycle stability sluggish reaction kinetics large-sized K-ions. Herein, we summarize latest research achievements different types carbon anodes KIBs, including graphite, graphene, hard carbon, soft nanotubes, which key factors affecting electrochemical performance are explored. Importantly, alternative strategies addressing low gravimetric/volumetric capacity efficiency carbons thoroughly emphasized. Finally, critical issues, challenges, perspectives proposed development direction We hope review can provide researchers new ideas design materials give insightful accelerate application electrodes

Язык: Английский

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Nitrogen and Sulfur Co‐Doped Hierarchically Porous Carbon Nanotubes for Fast Potassium Ion Storage

Small, Год журнала: 2022, Номер 18(42)

Опубликована: Сен. 23, 2022

Exploration of advanced carbon anode material is the key to circumventing sluggish kinetics and poor rate capability for potassium ion storage. Herein, a synergistic synthetic strategy engineering both surface structure adopted design N, S co-doped nanotubes (NS-CNTs). The as-designed NS-CNTs exhibit unique features defective surface, hollow tubular channel, enlarged interlayer space. These significantly contribute large storage capacity 307 mA h g-1 at 1 A remarkable performance with 151 even 5 . Furthermore, an excellent cyclability 98% retention after 500 cycles 2 also achieved. Systematic analysis by in situ Raman spectroscopy ex TEM demonstrates structural stability reversibility charge-discharge process. Although studies reveal capacitive-dominated process storage, density functional theory calculations provide evidence that co-doping contributes expanding space promote K-ion insertion, improving electronic conductivity, providing ample sites favor adsorption.

Язык: Английский

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Single‐atomic Co‐B ₂ N ₂ sites anchored on carbon nanotube arrays promote lithium polysulfide conversion in lithium–sulfur batteries

Carbon Energy, Год журнала: 2023, Номер 5(11)

Опубликована: Март 23, 2023

Abstract Due to low cost, high capacity, and energy density, lithium–sulfur (Li–S) batteries have attracted much attention; however, their cycling performance was largely limited by the poor redox kinetics sulfur utilization. Herein, predicted density functional theory calculations, single‐atomic Co‐B 2 N site‐imbedded boron nitrogen co‐doped carbon nanotubes (SA‐Co/BNC) were designed accomplish loading, fast kinetic, long service period Li–S batteries. Experiments proved that atomic sites can effectively catalyze lithium polysulfide conversion. Therefore, electrodes delivered a specific capacity of 1106 mAh g −1 at 0.2 C after 100 cycles exhibited an outstanding cycle over 1000 1 with decay rate 0.032% per cycle. Our study offers new strategy couple combined effect nanocarriers catalysts in novel coordination environments for high‐performance

Язык: Английский

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Defect Engineering of Disordered Carbon Anodes with Ultra-High Heteroatom Doping Through a Supermolecule-Mediated Strategy for Potassium-Ion Hybrid Capacitors

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Янв. 27, 2023

Amorphous carbons are promising anodes for high-rate potassium-ion batteries. Most low-temperature annealed amorphous display unsatisfactory capacities. Heteroatom-induced defect engineering of could enhance their reversible Nevertheless, most lignocellulose biomasses lack heteroatoms, making it a challenge to design highly heteroatom-doped (> 10 at%). Herein, we report new preparation strategy carbon anodes. Nitrogen/sulfur co-doped lignin-derived porous (NSLPC) with ultra-high nitrogen doping levels (21.6 at% N and 0.8 S) from renewable lignin biomacromolecule precursors were prepared through supramolecule-mediated pyrolysis strategy. This supermolecule/lignin composite decomposes forming covalently bonded graphitic carbon/amorphous intermediate product, which induces the formation high heteroatom in obtained NSLPC. unique chemistry NSLPC enable abundant defective active sites adsorption K+ improved kinetics. The anode delivered capacity 419 mAh g‒1 superior cycling stability (capacity retention 96.6% at 1 A 1000 cycles). Potassium-ion hybrid capacitors assembled by exhibited excellent (91% 2000 cycles) energy density 71 Wh kg-1 power 92 W kg-1.

Язык: Английский

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