Insight into the structural evolution mechanism and potassium storage performance of expanded graphitic onion-like carbon

Meng, Chenyang; Yuan, Man; Cao, Bin; Jiang, Zipeng; Zhang, Jiapeng; Li, Ang; Chen, Xiaohong; Jia, Mengqiu; Song, Huaihe

doi:10.1039/d2ta06038h

Cited by 16 publications

(15 citation statements)

References 61 publications

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“…Graphitic onion-like carbon (GOC) was prepared from pyridine by one-step injection pyrolysis and subsequent graphitization. , The oxidized graphitic onion-like carbon (O-GOC) was prepared by the modified Hummer’s method from GOC . Then, the O-GOC sample was carbonized at 300, 500, and 700 °C kept for 1 h with a heating rate of 2 °C min –1 in a N 2 atmosphere to obtain a series of mild-expanded graphitic onion-like carbon (MEGOC) samples, which are denoted as MEGOC300, MEGOC500, and MEGOC700, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…We have previously prepared expanded graphitic onion-like carbon with superior electrochemical properties by rapid thermal reduction. However, the large specific surface area of expanded graphitic onion-like carbon makes its initial Coulombic efficiency low (∼18%) . Further structural optimization is required to improve the electrochemical properties of GOC by increasing the initial Coulombic efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…However, the large specific surface area of expanded graphitic onion-like carbon makes its initial Coulombic efficiency low (∼18%). 22 Further structural optimization is required to improve the electrochemical properties of GOC by increasing the initial Coulombic efficiency.…”

Section: ■ Introductionmentioning

confidence: 99%

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Mild-Expanded Graphitic Onion-like Carbon with Nonflammable Electrolytes for Safety and High-Performance Potassium Storage

Meng

Jiang

Cao

et al. 2023

ACS Sustainable Chem. Eng.

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Potassium-ion batteries (PIBs) are attractive energy storage devices due to the abundant low-cost potassium resources, and graphite is one of the most competing anodes of PIBs. Nevertheless, graphite often suffers from sluggish kinetics, large volume variations, and high activity of K + , leading to poor rate and low-temperature performance, insufficient cyclability, and safety issues. Herein, mild-expanded graphitic onion-like carbon (MEGOC) with an enlarged interlayer distance is prepared from confined graphitic onion-like carbon by liquid-phase oxidation and slow thermal reduction, which can accommodate volume variations and promote potassium diffusion. Meanwhile, using triethyl phosphate, a nonflammable and low-melting-point electrolyte ensures safety and low-temperature operation performance. In the nonflammable potassium-ion electrolyte, MEGOC exhibits long cycle life at a high rate (175 mA h g −1 at 2C after 1500 cycles) and superior low-temperature performance (165 mA h g −1 at −40 °C). Furthermore, an assembled nonflammable potassium-ion capacitor with MEGOC as the anode exhibits high reversibility and superior energy/power density at ambient and low temperatures. Accordingly, combining structural engineering and electrolyte engineering is an effective strategy for improving the safety and high performance of potassium-based electrochemical energy storage devices.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mild-Expanded Graphitic Onion-like Carbon with Nonflammable Electrolytes for Safety and High-Performance Potassium Storage

Meng

Jiang

Cao

et al. 2023

ACS Sustainable Chem. Eng.

Self Cite

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“…Copyright © 2015, American Chemical Society; b) Structural transition from GOC to EGOC. [32] Reprinted from Meng et al, with permission. Copyright © 2022, Royal Society of Chemistry; c) Schematic illustration of the evolution of the surface on the graphite.…”

Section: Graphitic Carbon Materialsmentioning

confidence: 99%

Carbon Electrode Materials for Advanced Potassium‐Ion Storage

Zhang

Huang

et al. 2023

Angew Chem Int Ed

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Tremendous progress has been made in the field of electrochemical energy storage devices that rely on potassium‐ions as charge carriers due to their abundant resources and excellent ion transport properties. Nevertheless, future practical developments not only count on advanced electrode materials with superior electrochemical performance, but also on competitive costs of electrodes for scalable production. In the past few decades, advanced carbon materials have attracted great interest due to their low cost, high selectivity, and structural suitability and have been widely investigated as functional materials for potassium‐ion storage. This article provides an up‐to‐date overview of this rapidly developing field, focusing on recent advanced and mechanistic understanding of carbon‐based electrode materials for potassium‐ion batteries. In addition, we also discuss recent achievements of dual‐ion batteries and conversion‐type K−X (X=O2, CO2, S, Se, I2) batteries towards potential practical applications as high‐voltage and high‐power devices, and summarize carbon‐based materials as the host for K‐metal protection and possible directions for the development of potassium energy‐related devices as well. Based on this, we bridge the gaps between various carbon‐based functional materials structure and the related potassium‐ion storage performance, especially provide guidance on carbon material design principles for next‐generation potassium‐ion storage devices.

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“…Besides, Meng et al demonstrated the transformation of confined graphite into a bamboo shoot-like structure using Hummers oxidation and rapid thermal expansion with graphitic onion-like carbon (GOC). [33] The polyhedral structure and interlaced graphitic layers of GOC restrict the escape of gas, forming expanded graphitic onion-like carbon (EGOC) with a helical structure and numerous wavy wrinkles (Figure 3a). The work provides a highperformance expanded graphite electrode for developing and applying potassium-ion energy storage systems.…”

Section: Graphitementioning

confidence: 99%

Advanced Electrode Materials for Potassium‐Ion Hybrid Capacitors

Chen

Shen

Xiong

et al. 2023

Batteries & Supercaps

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Potassium‐ion hybrid capacitors (PIHCs) overcome the limitations of potassium‐ion batteries (PIBs) and supercapacitors (SCs) and integrate the advantages of both, including high energy density, high power density, low cost, long cycle life, and stable electrochemical performance. However, the development of PIHCs is hindered by thermodynamic instability and kinetic hysteresis. Additionally, the dynamic mismatch between anode and cathode materials poses an urgent challenge. To this end, many research works related to material development have been dedicated to overcoming the drawbacks. In this review, the energy storage mechanism of PIHCs is briefly introduced. Moreover, the research progress and achievements of anode and cathode materials in recent years are reviewed, including carbon‐based materials, MXenes, transition metal materials, Prussian blue and its analogues. Finally, the challenges and prospects of PIHCs are proposed, together with guiding significant research directions in the future.

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Insight into the structural evolution mechanism and potassium storage performance of expanded graphitic onion-like carbon

Abstract: Although expanded graphite prepared from flake graphite has been well developed, the expanded mechanism of graphite with confined structure has not been well researched. Herein, we systematically reveal how the...

Cited by 16 publications

References 61 publications

Mild-Expanded Graphitic Onion-like Carbon with Nonflammable Electrolytes for Safety and High-Performance Potassium Storage

Mild-Expanded Graphitic Onion-like Carbon with Nonflammable Electrolytes for Safety and High-Performance Potassium Storage

Carbon Electrode Materials for Advanced Potassium‐Ion Storage

Advanced Electrode Materials for Potassium‐Ion Hybrid Capacitors

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