Large scale production of nanoporous graphene sheets and their application in lithium ion battery

Scalable and rapid Far Infrared reduction of graphene oxide for high performance lithium ion batteries

“…The XRD profiles distinctly reveal the presence of Li o100 4 and Li o110 4 peaks in the lithiated graphene samples. Interestingly, recent studies with graphene-based anodes have also reported the observation of such lithium metal peaks [27,28], further contributing to the confirmation of the defect-induced plating phenomenon in graphene [15,29]. Further, the lithium metal peaks are conspicuously absent in the delithiated samples, suggesting that the lithium metal plating is indeed reversible.…”

High‐Density Monolith of N‐Doped Holey Graphene for Ultrahigh Volumetric Capacity of Li‐Ion Batteries

“…The holey structure in the individual graphene sheets could not only provide effi cient diffusion channels for Li ions and a highly conductive pathway for electrons, but also provided more edges on the sheet to enhance Li intercalation. [ 31,32 ] NHGM was obtained by conjugating N-containing holey-graphene sheets into a 3D hydrogel, followed by evaporation of the trapped water under vacuum at room temperature and an annealing treatment under Ar atmosphere. This highly compact but porous architecture with heteroatom doping is favorable for ion diffusion, Li ion storage, and maximizing the LIB properties; the NHGM had a volumetric capacity of 1052 mAh cm −3 , which is nearly three times that of commercial graphite anodes (370 mAh cm −3 ), [ 33 ] and exhibited competitive characteristics over the existing Si-based and carbon/sulfur hybrid electrode materials (see Table S1 in the Supporting Information).…”

Clar Rules the Electronic Properties of 2D π‐Conjugated Frameworks: Mind the Gap

“…[15][16][17][18][19] Holey graphenes present aw ide range of potential technological applicationsr anging from sensing and nanoelectronics to energy andg as storage. [12,16,[20][21][22][23] The materials studied here, structurally converge with the latticeso fc onjugated microporous polymers and conjugated covalent organic frameworks. [15][16][17][18][19] These systems, in contrastw ith most holey graphenes, are chemically accessible,y et their properties depend on different factors such as molecular weightd istributions,c rystallinity and purity,which are difficult to control.…”