Combined capacitive and electrochemical charge storage mechanism in high-performance graphene-based lithium-ion batteries

Scaravonati, Silvio; Sidoli, Michele; Magnani, Giacomo; Morenghi, Alberto; Canova, Marcello; Kim, Jung Hyun; Riccò, Mauro; Pontiroli, Daniele

doi:10.1016/j.mtener.2021.100928

Cited by 11 publications

(14 citation statements)

References 62 publications

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“…where k 1 v and k 2 v 1/2 represent capacitive contribution and intercalation storage contribution, respectively. 27,28 The ratio of the capacitive contribution increases from 59 to 83% with the increase of the scan rate from 0.1 to 1.0 mV s −1 (Figure 4c), implying that the charge storage of the CFG is dominated by the capacitive controlled process, especially at high scan rates. The capacitive-controlled contributions are larger than 80% at 0.8 and 1.0 mV s −1 , as illustrated in Figure 4d.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…This might be due to the presence of both surface Li adsorption and Li diffusion between short ordered-range graphene planes. 28 To quantify the contribution of capacitive and diffusion effects to the total capacity, their ratios are calculated based on the following formula:…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As shown in Figure b, the anodic and cathodic b values are calculated to be 0.987 and 0.727, respectively, which demonstrate that ion transport in the CFG electrode mainly originates from the fast surface-controlled capacitive behavior. This might be due to the presence of both surface Li adsorption and Li diffusion between short ordered-range graphene planes . To quantify the contribution of capacitive and diffusion effects to the total capacity, their ratios are calculated based on the following formula: i ( V ) = k 1 v + k 2 v 1/2 , where k 1 v and k 2 v 1/2 represent capacitive contribution and intercalation storage contribution, respectively. , The ratio of the capacitive contribution increases from 59 to 83% with the increase of the scan rate from 0.1 to 1.0 mV s –1 (Figure c), implying that the charge storage of the CFG is dominated by the capacitive controlled process, especially at high scan rates.…”

Section: Resultsmentioning

confidence: 99%

“…This might be due to the presence of both surface Li adsorption and Li diffusion between short ordered-range graphene planes . To quantify the contribution of capacitive and diffusion effects to the total capacity, their ratios are calculated based on the following formula: i ( V ) = k 1 v + k 2 v 1/2 , where k 1 v and k 2 v 1/2 represent capacitive contribution and intercalation storage contribution, respectively. , The ratio of the capacitive contribution increases from 59 to 83% with the increase of the scan rate from 0.1 to 1.0 mV s –1 (Figure c), implying that the charge storage of the CFG is dominated by the capacitive controlled process, especially at high scan rates. The capacitive-controlled contributions are larger than 80% at 0.8 and 1.0 mV s –1 , as illustrated in Figure d.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Ordered-Range Tuning of Flash Graphene for Fast-Charging Lithium-Ion Batteries

Yang

Sun

Zhai

et al. 2023

ACS Appl. Nano Mater.

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Graphene has yet to be mass produced, so practical fast-charging lithium-ion battery (LIB) prototypes based on graphene are scarce. Graphene suffers from long in-plane and reluctant in-depth lithium diffusion due to its defect-free atomic arrangement, resulting in unsatisfactory rate performance as LIB anodes. In this work, combinatorial flash joule heating and ball milling treatment are implemented to enable gram-scale production of graphene in seconds (known as flash graphene, FG) and in-plane ordered-range modulation of graphene architectures. Following the ball milling, the defect-deficient turbostratic FG is transformed to defect-rich cracked FG (CFG), which has shortened ordered ranges and larger interlayer spacings. The CFG anode outperforms FG, commercial carbon black, and graphite electrodes in terms of specific capacity and rate performance due to open channels and shortened pathways for Li+ transport. Moreover, it shows outstanding cycling stability with a high capacity retention of 99% at the 500th cycle. Furthermore, it works well with the LiFePO4 cathode, enabling fast-charging LIB full battery with a state of charge of 77 and 62% at 2C and 4C, respectively. This research on graphene production and structural engineering provides a practical application for the commercial potential of fast-charging LIBs.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Ordered-Range Tuning of Flash Graphene for Fast-Charging Lithium-Ion Batteries

Yang

Sun

Zhai

et al. 2023

ACS Appl. Nano Mater.

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“…Graphene, a single layer of carbon atoms arranged in a hexagonal honeycomb structure, has attracted many scientists because of its exceptional thermal, electronic, and mechanical characteristics. Graphene has been found to have excellent properties for different fields including electronic gadgets, 1 nanocomposites, 2 energy storage such as ultra-capacitors, [3][4][5] and batteries, 6 fuel cells, [7][8][9][10][11] solar cells, [12][13][14] and biotechnologies. [15][16][17][18][19] However, due to the high cost and difficulty of producing graphene, several efforts have been made to develop efficient and affordable processes to produce and use graphene derivatives, such as graphene oxide (GO).…”

Section: Introductionmentioning

confidence: 99%

An electrochemical sensor for flubendiamide insecticide analysis based on chitosan/reduced graphene oxide

et al. 2023

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On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

Sun

et al. 2023

Advanced Materials

114

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Graphene with fascinating physicochemical properties has been regarded as one of the most promising candidates to substitute the commercial graphite anode for next-generation lithium-ion batteries (LIBs). [1] As originally suggested by Dahn's group, Li ions can be adsorbed on each side of graphene, forming a Li 2 C 6 stoichiometry with a theoretical specific capacity of 744 mAh g −1 , twice that of graphite (372 mAh g −1 of the first-stage LiC 6 intercalation compound). [2] However, in situ Raman spectroscopy reveals that it is difficult to achieve high Li coverage on graphene because of the low binding energy of Li with carbon and the strong Coulombic repulsion between the adsorbed Li ions. [3] Using density functional theory (DFT) calculations, Lee et al. also found that Li cannot reside on the surface of pristine graphene since its adsorption energy is positive for the entire range of Li content. [4] Therefore, the Li storage capacity of pristine graphene is far from its theoretical value, and is even inferior to that of graphite. Accordingly, it was proposed that defective graphene presents superior Li adsorption because of the increased charge transfer between Li and the defects, and moreover, the specific capacity rises with the increase of defects densities. [5] In the case of the maximum divacancy defect density, the Li storage capacity can reach up to 1675 mAh g −1 . In this regard, reduced graphene oxide (rGO), a form of graphene prepared by a chemical oxidation-exfoliation-reduction process, has been proven to be a potential anode by virtue of its abundant defects and the residual O-containing functional groups. [6] On the other hand, rGO also exhibits the advantages of mass production from the reduction of graphene oxide (GO) with contained costs, which is an essential step for practical applications. [7] As a result, rGO anode is more frequently studied as compared to its pristine graphene counterpart.The groundbreaking work of graphene anodes was reported in 2008 by Honma's group, who demonstrated that the incorporation of carbonaceous materials, i.e., carbon nanotubes (CNTs) and fullerenes (C 60 ), into graphene sheets can efficiently expand the interlayer spacing, thus higher Li storage capacities. [8] Soon Graphene has long been recognized as a potential anode for next-generation lithium-ion batteries (LIBs). The past decade has witnessed the rapid advancement of graphene anodes, and considerable breakthroughs are achieved so far. In this review, the aim is to provide a research roadmap of graphene anodes toward practical LIBs. The Li storage mechanism of graphene is started with and then the approaches to improve its electrochemical performance are comprehensively summarized. First, morphologically engineered graphene anodes with porous, spheric, ribboned, defective and holey structures display improved capacity and rate performance owing to their highly accessible surface area, interconnected diffusion channels, and sufficient active sites. Surface-modified graphene anodes with less aggreg...

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Combined capacitive and electrochemical charge storage mechanism in high-performance graphene-based lithium-ion batteries

Cited by 11 publications

References 62 publications

Ordered-Range Tuning of Flash Graphene for Fast-Charging Lithium-Ion Batteries

Ordered-Range Tuning of Flash Graphene for Fast-Charging Lithium-Ion Batteries

An electrochemical sensor for flubendiamide insecticide analysis based on chitosan/reduced graphene oxide

On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

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