Universal roles of hydrogen in electrochemical performance of graphene: high rate capacity and atomistic origins

Ye, Jianchao; Ong, Mitchell T.; Heo, Tae Wook; Campbell, Patrick G.; Worsley, Marcus A.; Liu, Yuanyue; Shin, S. J.; Charnvanichborikarn, Supakit; Matthews, Manyalibo J.; Bagge‐Hansen, Michael; Lee, Jonathan R. I.; Wood, Brandon C.; Wang, Y. Morris

doi:10.1038/srep16190

Cited by 16 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Substitutional doping with nitrogen in graphene is revealed to influence the electronic and adsorption properties of graphene significantly as well [19]. A very recent work demonstrated that hydrogen could enhance the capacity of graphene anode materials for lithium-ion batteries [20]. (2) Defect engineering: By functionalizing graphene sheets with hierarchical arrangement of pore structures and hence a high number of reactive sites for electrochemical reactions, Xiao et al realized an exceptionally high capacity electroded15,000 mA h/g [21].…”

Section: Introductionmentioning

confidence: 99%

Grain boundary and curvature enhanced lithium adsorption on carbon

Pang

Shi

Wei

et al. 2016

Carbon

View full text Add to dashboard Cite

a b s t r a c tWhile the speculation that graphene may owe double or even higher capacity of lithium adsorption than graphite does remains speculative, there is growing evidence that defects and edges may promote lithium adsorption on graphene and other nanostructured carbon. Here we report a first-principles study on how grain boundary defects in graphene may influence the adsorption of lithium. The adsorption energy for Li atoms trapping in 5-, 7-, and 8-rings is much lower than the counter-part of Li atoms and pristine graphene. Such defective graphene could adsorb more Li atoms, and may reach the speculated ratio of 1:1 for C-Li adsorption. In a contrast study of lithium on fullerenes of different size, we find that the adsorption energy decreases with increasing size of fullerenes, but does not approach the energy when Li atoms adsorb on flat graphene. The energy in carbon nanotubes, however, converges to the adsorption energy between Li atoms and flat graphene if the radius of carbon nanotubes is sufficiently large. It hence indicates that while curvature plays a role in the enhanced adsorption in fullerenes, the twelve 5 rings in a fullerene ball is the primary factor accounting for the enhanced lithium adsorption.

show abstract

Section: Introductionmentioning

confidence: 99%

Grain boundary and curvature enhanced lithium adsorption on carbon

Pang

Shi

Wei

et al. 2016

Carbon

View full text Add to dashboard Cite

show abstract

“…[47] It has also been reported that C-H bonds facilitate fast lithium transport and reversible surface binding of graphene nanofoam electrodes in lithium-ion batteries. [48] A similar high capacity and stability is observed in the plasma-printed graphite electrodes due to the synergistic effects of surface oxygen moieties, C-H bonds, and sp 2 structure. To examine the Li-ion storage property of plasma printed recycled graphite electrode, cyclic voltammetry (CV) was performed in the voltage window between 0.01 and 1.5 V at a scan rate of 0.05 mV s -1 .…”

Section: Cell Assembly and Electrochemical Characterizationmentioning

confidence: 72%

“…Moreover, Hfunctionalities such as C-H, hydroxyl, carboxyl groups in the edge sites improve the lithium storage capacity by surface adsorption and open up more space for Li + transportation and intercalation into the graphite layers. [48] A schematic sketch explaining different phases of Li + storage mechanism into the plasma printed recycled graphite is shown in figure 6. [8,50] The increase in the interlayer distance between the graphene sheets as shown in XRD (figure 2d) can accommodate lithium in both the faces of the graphene layers.…”

Section: Electrochemical Performancementioning

confidence: 99%

Plasma Jet Printing Induced High-Capacity Graphite Anodes for Sustainable Recycling of Lithium-Ion Batteries

et al. 2022

View full text Add to dashboard Cite

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

Sun

et al. 2023

Advanced Materials

109

View full text Add to dashboard Cite

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...

show abstract

Universal roles of hydrogen in electrochemical performance of graphene: high rate capacity and atomistic origins

Cited by 16 publications

References 50 publications

Grain boundary and curvature enhanced lithium adsorption on carbon

Grain boundary and curvature enhanced lithium adsorption on carbon

Plasma Jet Printing Induced High-Capacity Graphite Anodes for Sustainable Recycling of Lithium-Ion Batteries

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

Contact Info

Product

Resources

About