Tuning Metallic Co0.85Se Quantum Dots/Carbon Hollow Polyhedrons with Tertiary Hierarchical Structure for High-Performance Potassium Ion Batteries

Liu, Zhiwei; Han, Kun; Li, Ping; Wang, Wei; He, Donglin; Tan, Qiwei; Wang, Leying; Li, Yang; Qin, Mingli; Qu, Xuanhui

doi:10.1007/s40820-019-0326-5

Cited by 54 publications

(44 citation statements)

References 64 publications

(65 reference statements)

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“…The gradual capacity increase of CFSe/C composites could be ascribed to the sluggish activation process by hierarchical structure and the formation of SEI layer by electrolyte decomposition. [41,51,52] The CFSe/C-300 composite exhibits a similar electrochemical performance as CFSe/C-250, whereas the CFSe/C-500 composite exhibits a rapid capacity decrease after 90 cycles. The aggregates of bimetallic selenides in CFSe/C-500 are prone to cracking during a repeated charge-discharge process, leading to a significant capacity decay.…”

Section: Resultsmentioning

confidence: 99%

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Yang

Kang

Park

et al. 2020

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Potassium‐ion batteries (KIBs) are considered as promising alternatives to lithium‐ion batteries owing to the abundance and affordability of potassium. However, the development of suitable electrode materials that can stably store large‐sized K ions remains a challenge. This study proposes a facile impregnation method for synthesizing ultrafine cobalt–iron bimetallic selenides embedded in hollow mesoporous carbon nanospheres (HMCSs) as superior anodes for KIBs. This involves loading metal precursors into HMCS templates using a repeated “drop and drying” process followed by selenization at various temperatures, facilitating not only the preparation of bimetallic selenide/carbon composites but also controlling their structures. HMCSs serve as structural skeletons, conductive templates, and vehicles to restrain the overgrowth of bimetallic selenide particles during thermal treatment. Various analysis strategies are employed to investigate the charge–discharge mechanism of the new bimetallic selenide anodes. This unique‐structured composite exhibits a high discharge capacity (485 mA h g−1 at 0.1 A g−1 after 200 cycles) and enhanced rate capability (272 mA h g−1 at 2.0 A g−1) as a promising anode material for KIBs. Furthermore, the electrochemical properties of various nanostructures, from hollow to frog egg‐like structures, obtained by adjusting the selenization temperature, are compared.

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Section: Resultsmentioning

confidence: 99%

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Yang

Kang

Park

et al. 2020

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“…[31][32][33][34] Carbonaceous materials are not only used as active material, but also as carbon skeleton to improve reaction kinetics of Na + / K + and structural stability of composite materials, such as anode (alloying materials, conversion materials, intercalation materials) and cathode (polyanionic, layered oxides, hexacyanometallates). [6,[35][36][37][38][39] Specifically, the introducing carbon skeleton could provide electrochemically protective layer to accommodate volume variation and prevent the direct reaction between active component and electrolyte, which induced a stable SEI layer on the surface of carbon layer to avoid pulverization and failure of active component. [40,41] In addition, carbon materials not only boost the electron conduction in carbon component but also tune the electronic properties of active component.…”

Section: Introductionmentioning

confidence: 99%

Carbon Anode Materials: A Detailed Comparison between Na‐ion and K‐ion Batteries

Zhang

Wang

et al. 2021

Advanced Energy Materials

185

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distribution make it difficult to meet the demand of large-scale energy storage device with low cost and high performance. [1,2] Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs), as "post Li-ion batteries," share similar operation principles and battery device to LIBs. [3-8] In recent years, they have drawn great attention due to obvious advantages such as high sodium/potassium abundance, even distribution and low cost, which are ideal candidates for high-performance secondary batteries in large-scale storage systems. With the continuous development of clean energy technology (including wind energy, solar energy, biomass energy, geotherm energy and water energy) and increasing proportion of clean power generation in the total power generation (the installed capacity of wind energy and solar energy may reach 7059 GW accounting for 49.21% in 2040), smart management of intermittent electricity is increasingly important. [9,10] The generated intermittent electricity needs to be regulated by a smart grid, which can be stored in high-performance SIBs/PIBs during low demand periods and released during peak demand periods, such as electricity supply of slow electric vehicles, residences, manufactories and remote area (Figure 1). [11-13] In some remote mountainous areas, there is no electricity transmission line and therefore SIBs/PIBs energy storage system can provide a continuous electricity supply as a power source. When electricity power is in short supply or out of power, SIBs/PIBs energy storage systems can provide considerable power to keep manufactory running or to power residences. Considering obvious advantages of carbon-based materials, such as abundant sources, low cost and chemical inertness, they show enormous potential as anode materials of SIBs and PIBs. [14-17] Carbon-based materials have different structures (graphite, graphene, hard carbon and soft carbon) and morphologies (0D, 1D, 2D, and 3D, here D represents dimension), [15,18-21] which makes it possible to control these factors of carbon-based materials to meet the demand of highly efficient Na + /K + storage. Graphite delivers two different Na + /K + storage behaviors with theoretical capacities of 35 mAh g −1 (Na + intercalation) and 279 mAh g −1 (K + intercalation), and the high theoretical capacity indicates that graphite is a potential candidate for PIBs. [22,23] Due to high specific surface area and abundant defects, graphene materials (except for pristine single-layered As novel "post lithium-ion batteries," sodium-ion batteries/potassium-ion batteries (SIBs/PIBs) are emerging and show bright prospect in large-scale energy storage applications due to abundant Na/K resources. Further benefits of this technology include, its low cost, chemical inertness and safety. Extensive research findings have demonstrated that carbon-based materials are promising candidates for both SIBs and PIBs. Although the two alkali-ion batteries have similar internal components and electrochemical reaction mechanisms, in carbon-based materials the stora...

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“…In spite of these advantages, scientific issues including the huge volume variation and sluggish ion transport in electrode materials caused by the much larger crystallographic radius of K + (1.38 Å) than that of Li + (0.76 Å) are still unresolved yet. For example, the commonly studied anode materials such as alloys Sn, Sb, P, or their alloys [7][8][9], sulfides [10] and selenides [11][12][13], suffered severe capacity decay problem although they could achieve high capacity.…”

Section: Introductionmentioning

confidence: 99%

Engineering Mesoporous Structure in Amorphous Carbon Boosts Potassium Storage with High Initial Coulombic Efficiency

et al. 2020

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Amorphous carbon shows great potential as an anode material for high-performance potassium-ion batteries; however, its abundant defects or micropores generally capture K ions, thus resulting in high irreversible capacity with low initial Coulombic efficiency (ICE) and limited practical application. Herein, pore engineering via a facile self-etching strategy is applied to achieve mesoporous carbon (meso-C) nanowires with interconnected framework. Abundant and evenly distributed mesopores could provide short K+ pathways for its rapid diffusion. Compared to microporous carbon with highly disordered structure, the meso-C with Zn-catalyzed short-range ordered structure enables more K+ to reversibly intercalate into the graphitic layers. Consequently, the meso-C shows an increased capacity by ~ 100 mAh g−1 at 0.1 A g−1, and the capacity retention is 70.7% after 1000 cycles at 1 A g−1. Multiple in/ex situ characterizations reveal the reversible structural changes during the charging/discharging process. Particularly, benefiting from the mesoporous structure with reduced specific surface area by 31.5 times and less defects, the meso-C generates less irreversible capacity with high ICE up to 76.7%, one of the best reported values so far. This work provides a new perspective that mesopores engineering can effectively accelerate K+ diffusion and enhance K+ adsorption/intercalation storage.

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Tuning Metallic Co0.85Se Quantum Dots/Carbon Hollow Polyhedrons with Tertiary Hierarchical Structure for High-Performance Potassium Ion Batteries

Cited by 54 publications

References 64 publications

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Carbon Anode Materials: A Detailed Comparison between Na‐ion and K‐ion Batteries

Engineering Mesoporous Structure in Amorphous Carbon Boosts Potassium Storage with High Initial Coulombic Efficiency

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