Controllable engineering of intrinsic defects on carbon nanosheets enables fast and stable potassium storage performance

Dong, Sijin; Li, Yang; Zhang, Mengdi; Wang, Juntao; Li, Fengchun; Wu, Shuang; Dai, Pinqiang; Tong, Xing; Gu, Xin; Wu, Mingbo

doi:10.1016/j.carbon.2022.12.076

Cited by 10 publications

(5 citation statements)

References 56 publications

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“…These findings suggest that carbon has been successfully introduced. 35,36 Pure VO 2 exhibits two peaks at 515.8 and 522.8 eV in the V 2p spectrum, indicating the presence of V 4+ in VO 2 , as depicted in Fig. 2(d).…”

Section: Resultsmentioning

confidence: 87%

Synergistic carbon and oxygen vacancy engineering on vanadium dioxide nanobelts for efficient aqueous zinc-ion batteries

Gu,

Wang,

et al. 2023

Mater. Adv.

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Section: Resultsmentioning

confidence: 87%

Synergistic carbon and oxygen vacancy engineering on vanadium dioxide nanobelts for efficient aqueous zinc-ion batteries

Gu,

Wang,

et al. 2023

Mater. Adv.

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“…Contrastively, the corresponding E ads values of type 1, type 2, and type 3 were calculated to be −0.58, −0.71, and −0.51 eV, respectively. Moreover, the establishment of intrinsic defects can significantly enhance the interaction between Na and carbon layers, facilitating Na storage and increasing Na adsorption capacity. , Additionally, in terms of Na adsorption, the model with divacancy defects outperforms the model with single vacancy defects. Figure d–i shows top and side views, which intricately elucidate the variations in electron density of various defect models.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, the presence of the intrinsic defects promotes the adsorption of Na, thereby enhancing Na storage performance. 57 Furthermore, structures featuring divacancy defects exhibit a more apparent accumulation tendency of charge density. Therefore, this underscores the positive influence of intrinsic factors on enhancing Na + adsorption behavior.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Particularly, vacancy defects tend to concentrate more charge density, implying strong Na–C interaction. In this case, the presence of the intrinsic defects promotes the adsorption of Na, thereby enhancing Na storage performance . Furthermore, structures featuring divacancy defects exhibit a more apparent accumulation tendency of charge density.…”

Section: Resultsmentioning

confidence: 99%

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Dual-Functionalized Ca Enables High Sodiation Kinetics for Hard Carbon in Sodium-Ion Batteries

Li,

Shi,

et al. 2024

ACS Appl. Mater. Interfaces

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Hard carbons (HCs), while a leading candidate for sodium-ion battery (SIB) anode materials, face challenges in their unfavorable sodiation kinetics since the intricate microstructure of HCs complicates the Na + diffusion channel. Herein, a Hovenia dulcis-derived HC realizes a markedly enhanced highrate performance in virtue of dual-functionalized Ca. The interlayer doped Ca 2+ effectively enlarges the interlayer spacing, while the in situ-formed CaSe templates induce the formation of hierarchical pore structures and intrinsic defects, significantly providing fast Na + diffusion channels and abundant active sites and thus enhancing the sodium storage kinetics. Achieved by the synergistic effect of regulation of intrinsic microcrystalline and pore structures, the optimized HC shows remarkable performance enhancements, including a high reversible capacity of 350.3 mA h g −1 after 50 cycles at 50 mA g −1 , a high-capacity retention rate of 95.3% after 1000 cycles, and excellent rate performance (108.4 mA h g −1 at 2 A g −1 ). This work sheds light on valuable insight into the structural adjustment of high-rate HCs, facilitating the widespread utilization of SIBs.

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“…A couple of stable reduction peak near 0.01 V and oxidation peak at ≈0.55 V can be clearly observed, which are assigned to the reversible potassiation and depotassiation of TDPCNSs anode, respectively. [ 36 ] Galvanostatic charge‐discharge tests are further conducted to reveal the potassium storage behavior of TDPCNSs anode. As shown in Figure a, CNSs anode displays typical sloping charge/discharge curves with a relatively high average potassium storage potential of 0.54 V. In contrast, the average potassium storage potential for TDPCNSs anode is as low as 0.45 V, which is beneficial for promoting the energy density of PIBs.…”

Section: Resultsmentioning

confidence: 99%

Topological Defect‐Regulated Porous Carbon Anodes with Fast Interfacial and Bulk Kinetics for High‐Rate and High‐Energy‐Density Potassium‐Ion Batteries

Huang,

Chen,

Cen

et al. 2024

Advanced Materials

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Carbonaceous materials are regarded as one of the most promising anodes for potassium‐ion batteries (PIBs), but their rate capabilities have been largely limited by the slow solid‐state potassium diffusion kinetics inside anode and sluggish interfacial potassium ion transfer process. Herein, high‐rate and high‐capacity PIBs have been demonstrated by facile topological defect‐regulation of the microstructure of carbon anodes. The carbon lattice of the as‐obtained porous carbon nanosheets with abundant topological defects (TDPCNSs) holds high potassium adsorption energy yet low potassium migration barrier, thereby enabling efficient storage and diffusion of potassium inside graphitic layers. Moreover, the topological defects can induce preferential decomposition of anions, leading to the formation of high potassium ion conductive solid electrolyte interphase (SEI) film with decreased potassium ion de‐solvation and transfer barrier. Additionally, the dominant sp2‐hybridized carbon conjugated skeleton of TDPCNSs enables high electrical conductivity (39.4 S cm−1) and relatively low potassium storage potential. As a result, the as‐constructed TDPCNSs anode demonstrates high potassium storage capacity (504 mA h g−1 at 0.1 A g−1), remarkable rate capability (118 mA h g−1 at 40 A g−1) as well as long‐term cycling stability.This article is protected by copyright. All rights reserved

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Controllable engineering of intrinsic defects on carbon nanosheets enables fast and stable potassium storage performance

Cited by 10 publications

References 56 publications

Synergistic carbon and oxygen vacancy engineering on vanadium dioxide nanobelts for efficient aqueous zinc-ion batteries

Synergistic carbon and oxygen vacancy engineering on vanadium dioxide nanobelts for efficient aqueous zinc-ion batteries

Dual-Functionalized Ca Enables High Sodiation Kinetics for Hard Carbon in Sodium-Ion Batteries

Topological Defect‐Regulated Porous Carbon Anodes with Fast Interfacial and Bulk Kinetics for High‐Rate and High‐Energy‐Density Potassium‐Ion Batteries

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