Electrochemical Evaluation and Phase-related Impedance Studies on Silicon–Few Layer Graphene (FLG) Composite Electrode Systems

Huang, Qianye; Loveridge, Melanie; Genieser, Ronny; Lain, Michael; Bhagat, Rohit

doi:10.1038/s41598-018-19929-3

Cited by 48 publications

(51 citation statements)

References 29 publications

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“…In fact, when cycled at 0.2C after the first formation cycle, the FLGWJM can contribute only around 143.27 mAh g -1 , whilst GNPs contribute to 127.40 mAh g -1 reversibly after 200 cycles. The reversible capacity obtained from the graphenedominant electrodes was lower than reported in a previous study [31] and this is due to the higher applied current density (i.e. 715.8 mA g -1 in comparison to the literature's 357.9 mA g -1 ) in this study.…”

Section: Electrochemical Characterisationcontrasting

confidence: 83%

“…For the A c c e p t e d M a n u s c r i p t conductive additive, carbon black (Super C65, TIMCAL C-NERGY) was used. The aqueous-soluble binder used was partially neutralized polyacrylic acid (PAA), made from PAA powder (average Mw ~450,000, Sigma-Aldrich) and sodium hydroxide (according to the procedure proposed by Huang et al [31]). Figure 1a outlines all the formulation information for this study.…”

Section: Electrode Materialsmentioning

confidence: 99%

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Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

et al. 2020

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While silicon-based negative electrode materials have been extensively studied, to develop high capacity lithium-ion batteries, implementing a large-scale production method that can be easily transferred to industy, has been a crucial challenge. Here, a scalable wet-jet milling method was developed to prepare a silicon-graphene hybrid material to be used as negative electrode in lithium-ion batteries. This synthesized composite, when used as an anode in lithium cells, demonstrated high Li ion storage capacity, long cycling stability and high-rate capability. In particular, the electrode exhibited a reversible discharge capacity exceeding 1763 mAh g-1 after 450 cycles with a capacity retention of 98% and a coulombic efficiency of 99.85% (with a current density of 358 mA g-1). This significantly supersedes the performance of a Si-dominant electrode structures. The capacity fade rate after 450 cycles was only 0.005% per cycle in the 0.05-1 V range. This superior electrochemical performance is ascribed to the highly layered, silicon-graphene porous structure, as investigated via focused ion beam in conjunction with scanning electron microscopy (FIB-SEM) tomography. The hybrid electrode could retain 89% of its porosity (under a current density of 358 mA g-1) after 200 cycles compared with only 35% in a Si-dominant electrode. Moreover, this morphology can not only accommodate the large volume strains from active silicon particles, but also maintains robust electrical connectivity. This confers faster transportation of electrons and ions with significant permeation of electrolyte within the electrode. Physicochemical characterisations were performed to further correlate the electrochemical performance with the microstructural dynamics. The excellent performance of the hybrid material along with the scalability of the synthesizing process is a step forward to realize high capacity/energy density lithium-ion batteries for multiple device applications.

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Section: Electrochemical Characterisationcontrasting

confidence: 83%

Section: Electrode Materialsmentioning

confidence: 99%

Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

et al. 2020

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“…The first high frequency semicircle is due to formation of SEI film and the middle frequency semicircle is due to charge transfer resistance at the interface of electrode and electrolyte and double layer capacitance. [36,37] However, in the current scenario, the presence of amorphous carbon network around Si-NPs prevents them from delaminating. For better understanding about the composite system, EIS was performed on the fully delithiated cell.…”

Section: Electrochemical Performance Of the Tailored Composite Gcsi Amentioning

confidence: 92%

“…In Figure 5D, an ideal Nyquist plot of LIBs shows two semicircles with 45° linear drift of diffusion. [36] Such phenomena leads to the formation of well-developed pores in the electrode and better contact between particles, and current collector facilitating the better charge movement across the electrode. [34] The straight line indicates the diffusion of lithium ions.…”

Section: Electrochemical Performance Of the Tailored Composite Gcsi Amentioning

confidence: 99%

In Situ Mechanistic Elucidation of Superior Si‐C‐Graphite Li‐Ion Battery Anode Formation with Thermal Safety Aspects

Parekh

Sediako

Naseri

et al. 2019

Advanced Energy Materials

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understanding of the material synthesis/ fabrication, interfacial behavior, and thermal-chemical stabilities are vital. [3] With electronic appliances requiring stable voltage delivery, the current LIBs employ graphite or mixtures with soft carbons (carbon black) to achieve stable performance at discharge curves. [4] Since 1991, various forms of ordered and disordered (i.e., soft and hard) carbon have been primarily used as anode materials. [5] With graphitic carbon, a compromise was identified, which delivered a theoretical maximum capacity of 372 mAh g −1 , while maintaining stability and cycling characteristics. This stability comes at a cost of battery capacity, as it takes six carbon atoms to bind a single lithium ion (LiC 6 ) during charging process. [6] By contrast, alternative anode materials such as silicon, can bind about four lithium atoms (SiLi 4.4 ), improving energy densities by an order of magnitude. [7] Silicon anodes have garnered huge attention as they provide over ten times more theoretical capacity (3579 mAh g −1 ) than graphite anode. Problematically, the intercalated Si, Li 3.75 Si, swells in volume by about 320% during charging. Such huge volumetric expansion causes large material stresses, resulting in anode cracking, fracturing, loss of electrical contact (delamination), unstable solid electrolyte interface (SEI) and even catastrophic cell failure. [8][9][10][11] Naturally, this is unacceptable for practical and industrial applications. To overcome the capacity limitations of carbon, and the mechanical limitations of silicon, manufacturers have moved into composite materials-with the primary structure consisting of graphitic carbon, with silicon nanoparticles implanted within. First reported by Yoshio and co-workers in 2002, the C/Si composites did improve capacity, but the silicon nanoparticles were difficult to merge with the carbon bulk. [12,13] After repeated cycling, it was found that the particles separate and capacity drops. [14] Li et al. reported fabrication of graphite-Si composite using polymer blends of poly(diallyl dimethyl-ammonium chloride) and poly(sodium 4-styrenesulfonate) to obtain capacity of 450 mAh g −1 with 95% capacity retention after 200 cycles. [15] Zhang et al. prepared core-shell structure (Si@C) using silicon nanoparticles (Si-NPs) and emulsion polymerization of acrylonitrile, followed by pyrolysis. [16] The composite [15] retained A composite anode material synthesized using silicon nanoparticles, micrometer sized graphite particles, and starch-derived amorphous carbon (GCSi) offers scalability and enhanced electrochemical performance when compared to existing graphite anodes. Mechanistic elucidation of the formation steps of tailored GCSi composite are achieved with environmental transmission electron microscopy (ETEM) and thermal safety aspects of the composite anode are studied for the first time using specially designed multimode calorimetry for coin cell studies. Electrochemical analysis of the composite anode demonstrates a high initial discharge capaci...

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“…Figure 7a shows the voltage change in ZFO-G electrodes during the lithiation and delithiation for five cycles. On the other hand, the voltage shift in the ZFO-G-GL electrode was negligible compared to the ZFO-G electrode, which implies the stable status of the ZFO-G-GL electrode during the cycles due to a lower resistance [16,17]. Electrochemical impedance spectra for electrodes are shown in Figure 8a.…”

Section: Resultsmentioning

confidence: 99%

Well-Dispersed ZnFe2O4 Nanoparticles onto Graphene as Superior Anode Materials for Lithium Ion Batteries

Park

Kim

2019

Energies

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We prepared well-dispersed ZnFe2O4 (ZFO) nanoparticles on a graphene sheet by a facile one-step hydrothermal method using glucose as a novel linker agent and low-cost graphene flake. It was found that the glucose linkage on graphene not only prevented the aggregation of ZFO particles, but also induced the exfoliation of graphene flakes. The addition of glucose during the synthesis made surface linkages on the graphene surface, and it reacted with ZFO precursors, resulting in the well-dispersed ZFO nanoparticles/graphene composite. Furthermore, the size distribution of the resultant composite particles was also shifted to the smaller particle size compared to the composite prepared without glucose. The newly prepared ZFO/graphene composite provided a higher lithium storage capability and cycle performance compared to the ZFO/graphene sample which was prepared without glucose. The good dispersion of ZFO nanoparticles on graphene and the small particle size of the composite led to markedly improved electrochemical performance. Its reversible discharge capacity was 766 mAh g−1 at 1 A g−1, and it also maintained as 469 mAh g−1 at 6 A g−1.

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Electrochemical Evaluation and Phase-related Impedance Studies on Silicon–Few Layer Graphene (FLG) Composite Electrode Systems

Cited by 48 publications

References 29 publications

Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

In Situ Mechanistic Elucidation of Superior Si‐C‐Graphite Li‐Ion Battery Anode Formation with Thermal Safety Aspects

Well-Dispersed ZnFe2O4 Nanoparticles onto Graphene as Superior Anode Materials for Lithium Ion Batteries

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