Electronic transport in ultranarrow zigzag graphene nanoribbons with edge disorders

Liu, Y.L.; Xu, Guangyu; Zhang, X.W.

doi:10.1016/j.physb.2016.06.028

Cited by 1 publication

(1 citation statement)

References 26 publications

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“…Plenty of research has been focused on changing the structure of graphite to graphene families, to achieve higher capacities, via lithiation of these materials on both sides of the basal plane. These 2D carbons have been employed either by themselves, − or in composite form with other materials. − The flexible and strong sheets of honeycomb lattice carbon have been shown to improve electrochemical performance and device longevity in conjunction with silicon. − Among this family, graphene nanoribbons, in particular, can exhibit tunable size dependent electronic properties (such as metallic or semiconductive behavior), − making them attractive for new nanoelectronics applications. To date, graphene nanoribbon composites with materials like iron oxide, SnO 2 , and MnO 2 have been tested as successful anode materials for lithium-ion batteries. − Recently, Salvatierra et al fabricated Si nanowire-GNR standalone papers via vacuum filtration that exhibited an excellent electrochemical performance both in half-cell and full-cell configurations .…”

Section: Introductionmentioning

confidence: 99%

Harvesting Interconductivity and Intraconductivity of Graphene Nanoribbons for a Directly Deposited, High-Rate Silicon-Based Anode for Li-Ion Batteries

Shoorideh

Berry

et al. 2018

ACS Appl. Energy Mater.

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Batteries for high-rate applications such as electric vehicles need to be efficient at mobilizing charges (both electrons and ions). To this end, choice of the conductive carbon in the electrode can make a significant difference in the performance of the electrode. In this work, graphene nanoribbons (GNRs) are explored as conductive pathways for a silicon-based anode. Water-based electrospinning is employed to directly deposit poly(vinyl alcohol) (PVA)−silicon−graphene nanoribbon composite fibers on a copper current collector. The size of the employed GNRs dictates their placement: either inside each fiber (small GNRs) or as a bridge between multiple fibers (large GNRs). Galvanostatic charge/discharge cycles reveal that fibers with GNRs have higher capacity and overall retention compared to those with corresponding precursor carbon nanotubes (CNTs). To further distinguish the effectiveness of GNRs as the conductive agent, samples with two GNRs and their parent CNTs were subject to rate-capability tests. Fibers with large GNR inclusions exhibit an excellent performance at fast rates (1400 mAh g −1 at 12.6 A g −1 ). For both pairs, enhancement in the performance of GNRs over CNTs grows with increasing rates. Finally, a small amount of large GNRs (1 wt %) is blended with small GNRs in the fibers to create synergy between intra-and interconductivity provided by small and large GNRs, respectively. The resulting fiber mat exhibits the same capacity as that of only small GNRs, even at a current rate that is 4 times higher (300 mAh g −1 at 21 A g −1 ).

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