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Publisher statement:First published by Royal Society of Chemistry 2016 http://dx.doi.org/10.1039/C6CP06788C
A note on versions:The version presented here may differ from the published versio… Show more
“…It indicates that by incorporating FLG, the “roll-over” effect is significantly delayed, possibly due to the enhanced tensile properties from the FLG (Supplementary Figure 1 ), which reduces the rate of the pulverization of the electrode microstructure. When referring to the previous Si-FLG study 14 , which demonstrated about 200 cycles under the capacity 1800 mAh/g, it can be concluded that 16% FLG in this formulation is a more effective ratio. Figure 2 ( a ) Half-cell cyclability and ( b ) columbic delithiation efficiency under capacity limitation of 1800 mAh/g for Si-FLG formulation matrix (Formula A – 76% Si: 0% FLG: 12% Na-PAA: 12% Carbon.…”
Section: Resultsmentioning
confidence: 72%
“…A previous study on these systems has reported that interconnecting few-layer graphene (FLG) with Si can be an effective solution to enhance the cycling stability through the formation of a conductive, hierarchical structure 14 . This approach was adopted in this study and all electrodes were manufactured with a relatively high mass loading of micron-sized silicon particles using mechanical dispersion apparatus aligned with industrial electrode fabrication techniques.…”
Silicon-Few Layer Graphene (Si-FLG) composite electrodes are investigated using a scalable electrode manufacturing method. A comprehensive study on the electrochemical performance and the impedance response is measured using electrochemical impedance spectroscopy. The study demonstrates that the incorporation of few-layer graphene (FLG) results in significant improvement in terms of cyclability, electrode resistance and diffusion properties. Additionally, the diffusion impedance responses that occur during the phase changes in silicon is elucidated through Staircase Potentio Electrochemical Impedance Spectroscopy (SPEIS): a more comprehensive and straightforward approach than previous state-of-charge based diffusion studies.
“…It indicates that by incorporating FLG, the “roll-over” effect is significantly delayed, possibly due to the enhanced tensile properties from the FLG (Supplementary Figure 1 ), which reduces the rate of the pulverization of the electrode microstructure. When referring to the previous Si-FLG study 14 , which demonstrated about 200 cycles under the capacity 1800 mAh/g, it can be concluded that 16% FLG in this formulation is a more effective ratio. Figure 2 ( a ) Half-cell cyclability and ( b ) columbic delithiation efficiency under capacity limitation of 1800 mAh/g for Si-FLG formulation matrix (Formula A – 76% Si: 0% FLG: 12% Na-PAA: 12% Carbon.…”
Section: Resultsmentioning
confidence: 72%
“…A previous study on these systems has reported that interconnecting few-layer graphene (FLG) with Si can be an effective solution to enhance the cycling stability through the formation of a conductive, hierarchical structure 14 . This approach was adopted in this study and all electrodes were manufactured with a relatively high mass loading of micron-sized silicon particles using mechanical dispersion apparatus aligned with industrial electrode fabrication techniques.…”
Silicon-Few Layer Graphene (Si-FLG) composite electrodes are investigated using a scalable electrode manufacturing method. A comprehensive study on the electrochemical performance and the impedance response is measured using electrochemical impedance spectroscopy. The study demonstrates that the incorporation of few-layer graphene (FLG) results in significant improvement in terms of cyclability, electrode resistance and diffusion properties. Additionally, the diffusion impedance responses that occur during the phase changes in silicon is elucidated through Staircase Potentio Electrochemical Impedance Spectroscopy (SPEIS): a more comprehensive and straightforward approach than previous state-of-charge based diffusion studies.
“…9(b) the initial lithiation of crystalline bulk silicon results in a low voltage plateau corresponding to a two-phase region in which lithiated amorphous silicon is formed (a-Li x Si). 54,55 Limiting the capacity to around 1000 mA h g À1 will avoid the deleterious volume expansion, which occurs when the highest lithiated Si species Li 15 Si 4 is formed through recrystallisation. This phase formation is associated with an entire amorphous to crystalline transformation, whose onset occurs at around 60 mV and continues when the voltage < 50 mV.…”
“…The final aim would be that of providing a comprehensive tool to refer to in order to systematically evaluate and critically asses each new sodium-ion fullcell chemistry proposed in the literature, in order to probe its technological readiness level. Recently the research around high capacity anodes for SIBs (based on 14th and 15th group elements alloys or oxide based conversion materials) has been knowing a positive momentum, thanks to the hype also deriving from lithium-rich full battery counterpart (silicon [67,68] and sulfur [69] based LIBs). Not all the applications field would work for a sodium-ion technology.…”
“…The full-cell delivers an average operating voltage plateau at 2.53 V and extraordinary rate and superior cycling performance. 67 Ni 0.33 O 2 [317] and Na 0. It was demonstrated that this cation-disordered material can function as both positive and negative electrodes with average operation voltages of 3.5 and 0.8 V, corresponding to the RedOx couples Cr 4+ / Cr 3+ and Ti 4+ /Ti 3+ , respectively.…”
Section: Sodium-ion Full Battery Based On Layered Oxidesmentioning
IntroductionAs renewable energy sources are taking a wider share of worldwide energy production, [1] grids reliability and utilization efficiency are plummeting. [2,3] This is mainly due to intermittency and discontinuity of power sources, such as wind and solar, which determine uncertainties in energy production capability and in fulfilling the instantaneous energy demand. This aspect, in turn, sensibly increases the unpredictability of energy prices spikes and marginal and maintenance costs of traditional fossil fuel plants, which are demanded Since the breakthrough achieved in the research around material intercalating lithium, almost a decade has passed before the commercialization of the first lithium-ion battery (LIB). On the brink of an energy voracious future, convergence of scientific efforts over efficient and low-cost energy production and storage would be advantageous and beneficial. The research hovering around sodium-ion rechargeable batteries (SIBs), a more sustainable alternative to LIBs, has been observing a positive momentum for ten years now, and chemically stable and electrochemically performing anode and cathode materials represent important milestones on the path toward a commercial full-cell. Material science breakthroughs achieved in carbon and graphite based matrices, layered and open framework structures, and sodium storing alloys, disclose new full-cell set up opportunities going beyond traditional "rocking chair" configuration. In this contribution an in-depth analysis of chemical and physical principles lying beyond the energy storage provided by SIBs most recently investigated active materials is given. In the second half of the review, challenges, opportunities, and state-of-the art description of full-cell SIBs lab scale prototypes are discussed. The latter, indeed, stands for a technological validation of a low-cost alternative to lithium-ion batteries guaranteeing energy densities close to 150 Wh kg −1 .
Sodium-Ion Batteriesdiscontinuously to provide for power unbalances between demand and supply. In general, resilience to these drawbacks would be higher providing an incremented flexibility from demand response resources, interregional energy transmission, and energy storage. Plenty of energy storage systems (ESS) are being utilized to curb renewable energy sources intermittency. Among them, worth to be listed are hydroelectric (pumped hydro), mechanical (flywheels and compressed air), and electrochemical (lead-acid, Na-S, Na-NiCl 2 , and Li-ion batteries). [4] Nevertheless not all the previously cited energy storage technologies are comparable one with another in terms of scalability, environmental impact, investment costs, maintenance, and moreover, responsivity to energy needs. Batteries energy storage, directly suppling electric energy without requiring any mechanical-to-electrical energy transducer, surely represents the most versatile appliance. In particular, intrinsic flexibility of modern Li-ion batteries coupled to renewable power plants, ensures the proper response not...
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