Potassium‐Ion Batteries: Disordered, Large Interlayer Spacing, and Oxygen‐Rich Carbon Nanosheets for Potassium Ion Hybrid Capacitor (Adv. Energy Mater. 19/2019)

Chen, Jiangtao; Yang, Bingjun; Hou, Hongjun; Li, Hongxia; Liu, Li; Zhang, Li; Yan, Xingbin

doi:10.1002/aenm.201970069

Cited by 79 publications

(43 citation statements)

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“…The slight deformation of the curve under a high voltage close to 4.0 V, possibly results from the electrolyte decomposition. [ 17,57 ] The energy‐power densities of the BN‐PC//BN‐PC PIHC devices were calculated based on the total active materials mass of both anode and cathode (Figure 7d and Figure S15, Supporting Information). The optimal BN‐PC//BN‐PC PIHC device with mass matching of 1:1 displays an ultrahigh energy density of 174 Wh kg −1 at a power density of 497 W kg −1 .…”

Section: Resultsmentioning

confidence: 99%

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Liquid‐State Templates for Constructing B, N, Co‐Doping Porous Carbons with a Boosting of Potassium‐Ion Storage Performance

Feng

Liu

et al. 2020

Advanced Energy Materials

123

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lithium resources greatly limits the large-scale promotion and application of LIBs. [4-7] As possible candidates, sodium and potassium ion systems are receiving intense attention owing to their low cost and high natural abundant resources. [8-14] Particularly, recent studies indicated that compared with sodium ions, potassium ions exhibited more merits on the basis of its similar intercalation behaviors in graphite and closer redox potential (K/K + , −2.92 V) with Li ions. [15,16] Therefore, potassium ion energy storage system, including potassium ion batteries (PIBs) and potassium ion hybrid capacitors (PIHCs) demonstrates a promising prospect in practical applications, and the corresponding studying upsurge is just beginning. [16,17] In the exploration of potassium electrode materials, porous carbons are highly preferable owing to their elastic framework, rich porosity and good conductivity, which can efficiently alleviate the volume expansion caused by the larger K + (ionic radius, 1.38 Å) intercalation and provides more pathways for fast K + diffusion. [16,18-21] So far, many carbons with various porosities have been successfully used in potassium ion system, exhibiting excellent electrochemical performance. [22,23] In current strategies of producing porous carbons, the template method is considered as one ideal way owing to its good control of porous architectures. [16] Presently, solid-phase templates including salts, SiO 2 nanospheres, and metal foams have been applied widely in constructing porous carbons. [24-26] Besides, gas-phase templates such as gas bubbles and foams are also popular due to their facile and economical process. [23,27] Despite a great process, several challenges still remain. For example, salt or gas-phase templates are simple and scalable, but always create large-size pores, giving rise to the severe decrease of the volumetric capacitance. [28] The nanosized solid-phase templates can lead to small-size pores, but are hindered by high cost and the probability of contamination from the removal process. [29] Therefore, the development of a scalable and green template strategy for the synthesis of carbons with rich nanosized porosity is important. Notably, in contrast to the success of solid-and gas-phase templates, liquid-state templates are rarely reported so far, which might be Template-assistant design and fabrication of porous carbon electrode materials has experienced great progress throughout the past decades and yielded lots of successes via various gas or solid state templates. Nevertheless, liquid-state templates are rather rare in preparing porous carbon materials to date. In this work, melting B 2 O 3 beads are used as both templates and a B dopant, leading to unique B, N co-doping hierarchically porous carbons containing a "bubble pool"-like skeleton built of interconnected carbon nanobubbles. Notably, an interesting amending effect of doped B atoms on the N-doped carbon network can be identified for the first time, which creates a "paddy field"-like hybrid microstructure wi...

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Section: Resultsmentioning

confidence: 99%

“…[ 15,16 ] Therefore, potassium ion energy storage system, including potassium ion batteries (PIBs) and potassium ion hybrid capacitors (PIHCs) demonstrates a promising prospect in practical applications, and the corresponding studying upsurge is just beginning. [ 16,17 ]…”

Section: Introductionmentioning

confidence: 99%

Liquid‐State Templates for Constructing B, N, Co‐Doping Porous Carbons with a Boosting of Potassium‐Ion Storage Performance

Feng

Liu

et al. 2020

Advanced Energy Materials

123

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“…Both energy density and power density are comparable to or even exceed most of the reported lithium‐/sodium‐/PIHCs. [ 8,11,13,15,51,54–65 ] In terms of cycling stability, the CBC@G//ACBC device delivers an extraordinary cycling stability with a capacity retention of 81.5% over 5000 cycles at 5 A g −1 , only 0.0037% capacity decay per cycle (Figure 5f and Figure S21, Supporting Information). In addition, a CBC@G//ACBC fully charged at 5 A g −1 can easily light up a “BUCT” panel welded by yellow light‐emitting diodes (inset of Figure 5d).…”

Section: Resultsmentioning

confidence: 99%

Cucurbit[6]uril‐Derived Nitrogen‐Doped Hierarchical Porous Carbon Confined in Graphene Network for Potassium‐Ion Hybrid Capacitors

Qiu

Guan

et al. 2020

Advanced Science

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Potassium-ion hybrid capacitors (PIHCs) have attracted tremendous attention because their energy density is comparable to that of lithium-ion batteries, whose power density and cyclability are similar to those of supercapacitors. Herein, a pomegranate-like graphene-confined cucurbit[6]uril-derived nitrogen-doped carbon (CBC@G) with ultra-high nitrogen-doping level (15.5 at%) and unique supermesopore-macropores interconnected graphene network is synthesized. The carbonization mechanism of cucurbit[6]uril is verified by an in situ TG-IR technology. In a K half-cell configuration, CBC@G anode demonstrates a superior reversible capacity (349.1 mA h g −1 at 0.1 C) as well as outstanding rate capability and cyclability. Moreover, systematic in situ/ex situ characterizations, and theory calculations are carried out to reveal the origin of the superior electrochemical performances of CBC@G. Consequently, PIHCs constructed with CBC@G anode and KOH-activated cucurbit[6]uril-derived nitrogen-doped carbon cathode demonstrate ultra-high energy/power density (172 Wh kg −1 /22 kW kg −1) and extraordinary cyclability (81.5% capacity retention for 5000 cycles at 5 A g −1). This work opens up a new application field for cucurbit[6]uril and provides an alternative avenue for the exploitation of high-performance PIHCs.

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“…The parameter b can be determined by plotting log(| i |) against log( v ) . A b value of 0.5 indicates an ideal diffusion‐controlled process (intercalation) and the value of 1.0 presents a surface capacitive‐controlled process, i.e., pseudocapacitance K + storage . In our experiment, the b values (shown in Figure b and Figure S5 (Supporting Information)) for all electrodes are more than 0.7, indicating the surface capacitive process for potassium‐ion storage.…”

Section: Resultsmentioning

confidence: 68%

“…Figure a and Figure S3a–c (Supporting Information) exhibit the cyclic voltammetry (CV) curves of the MCCF electrodes at a scan rate of 0.1 mV s −1 for the initial five cycles. All the CV curves show a broad reduction peak located at ≈1.4 V only in the first cycle, which should correspond to the formation of the solid electrolyte interface film due to the decomposition of the electrolyte and other side reactions . The unsharp peaks below 0.4 V demonstrate the intercalation process of K + into MCCFs .…”

Section: Resultsmentioning

confidence: 91%

Constructing Multichannel Carbon Fibers as Freestanding Anodes for Potassium‐Ion Battery with High Capacity and Long Cycle Life

Yuan

Zhao

et al. 2019

Adv Materials Inter

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high reversible capacity of 273 mAh g −1 , close to the theoretical capacity of 279 mAh g −1 . [9] However, it suffers a significant capacity fading resulting from the large volume change of ≈60% during cycling process. [10,11] And, the rate performance needs to be improved at high current densities because of the poor diffusion kinetics of K + . [12,13] Thus, nongraphitic carbon-based materials prepared by various methods come into the research field of PIB anode. Such as, hard carbon microspheres fabricated by carbonizationetching strategy or hydrothermal reaction combined with pyrolysis method, [14,15] hard-soft composite carbon prepared by combination of hydrothermal reaction with pyrolysis method, [16] graphene prepared with a chemical vapor deposition (CVD) method, [17] graphene aerogel fabricated through Hummers' process combined with hydrothermal treatment process, [18] and carbon nanofiber prepared by a modified oxidative template assembly route following with annealing process. [19] Particularly, carbon nanofibers (CNFs) prepared by electrospinning organic precursor followed with heat treatment has gained great attention. The prepared CNFs possess many unique characteristics, such as flexibility, morphology controllability, and high conductivity, which suggest that the CNFs can be directly used as anode for PIB without binders and carbon-conductive additives, as well as the heavy metal foil. [12,20] In this way, the total specific capacity can be improved comparing with the electrode fabricated by traditional slurry-casting method. [21,22] As previous researches reported, designing specific structures, such as porous structure and hollow structure, is helpful to improve the electrochemical performance of PIB. [23][24][25][26] Porous structure can improve electrochemical performance by not only facilitating ion transport with shortened diffusion distance, but also providing small resistance. [24] For instance, Wan and co-workers have confirmed that hollow structure can facilitate the mass transportation by shorten diffusion pathway and buffer the volume change of anode material during cycling process. [25] Inspired by this, we introduce a unique structure amorphous carbon -multichannel carbon fibers (MCCFs) as freestanding PIB anode to solve the problems PIB suffered including the volume change and poor diffusion kinetics of K + during charge/ discharge process. Namely, on the one hand, the multichannels Potassium-ion battery (PIB) is a potential low-cost energy storage technology owing to the abundant source and wide distribution of potassium element. However, the PIB usually suffers from poor cycling and rate performance induced by volume expansion and sluggish potassiation kinetics. Herein, multichannel carbon fibers (MCCFs) are rationally constructed as freestanding PIB anodes by electrospinning suitable ratio of poly(methyl methacrylate)/polyacrylonitrile with subsequent calcination treatment. The MCCF electrode shows a high reversible capacity/charge capacity of 420.1/304.2 mAh g −1 at current dens...

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Potassium‐Ion Batteries: Disordered, Large Interlayer Spacing, and Oxygen‐Rich Carbon Nanosheets for Potassium Ion Hybrid Capacitor (Adv. Energy Mater. 19/2019)

Cited by 79 publications

References 0 publications

Liquid‐State Templates for Constructing B, N, Co‐Doping Porous Carbons with a Boosting of Potassium‐Ion Storage Performance

Liquid‐State Templates for Constructing B, N, Co‐Doping Porous Carbons with a Boosting of Potassium‐Ion Storage Performance

Cucurbit[6]uril‐Derived Nitrogen‐Doped Hierarchical Porous Carbon Confined in Graphene Network for Potassium‐Ion Hybrid Capacitors

Constructing Multichannel Carbon Fibers as Freestanding Anodes for Potassium‐Ion Battery with High Capacity and Long Cycle Life

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