Kinetics and electrochemical evolution of binary silicon–polymer systems for lithium ion batteries

Li, Changling; Liu, Chueh; Ahmed, Kazi; Yan, Yiran; Lee, Ilkeun; Ozkan, Mihrimah; Ozkan, Cengiz S.

doi:10.1039/c7ra06023h

Cited by 33 publications

(20 citation statements)

References 40 publications

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“…The impedance spectra ( Figure ) of the Gra/CNT electrode capacitor at 1.8 V before and after 10 000 cycles are fitted by the equivalent circuit model (Figure a) and the fitting parameters ( Table 1 ). The ESR indicates the resistances from the electrolyte, graphite current collectors, and the CNT electrode materials . Constant phase elements (CPEs) are spatially nonuniform capacitance with Q akin to the capacitance and the ideality factor n .…”

Section: Resultsmentioning

confidence: 99%

High‐Potential Metalless Nanocarbon Foam Supercapacitors Operating in Aqueous Electrolyte

Liu

Ahmed

et al. 2018

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Light-weight graphite foam decorated with carbon nanotubes (dia. 20-50 nm) is utilized as an effective electrode without binders, conductive additives, or metallic current collectors for supercapacitors in aqueous electrolyte. Facile nitric acid treatment renders wide operating potentials, high specific capacitances and energy densities, and long lifespan over 10 000 cycles manifested as 164.5 and 111.8 F g , 22.85 and 12.58 Wh kg , 74.6% and 95.6% capacitance retention for 2 and 1.8 V, respectively. Overcharge protection is demonstrated by repetitive cycling between 2 and 2.5 V for 2000 cycles without catastrophic structural demolition or severe capacity fading. Graphite foam without metallic strut possessing low density (≈0.4-0.45 g cm ) further reduces the total weight of the electrode. The thorough investigation of the specific capacitances and coulombic efficiencies versus potential windows and current densities provides insights into the selection of operation conditions for future practical devices.

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Section: Resultsmentioning

confidence: 99%

High‐Potential Metalless Nanocarbon Foam Supercapacitors Operating in Aqueous Electrolyte

Liu

Ahmed

et al. 2018

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“…This is judged to be a weight reduction due to the dehydration reaction of adsorb and crystallized water (below 200°C), and combustion of carbon generated in the silica fume manufactured process [26,27]. In the case of Si sludge, a rapid weight increase was observed above 600°C, which is attributed to the oxidation reaction where Si combines with oxygen in the atmosphere [11,28]. Figure 4 shows the optical image of the porous ceramic specimen surface with varying amounts of Si sludge substitution.…”

Section: Resultsmentioning

confidence: 99%

Thermal properties of porous ceramics manufactured by direct foaming using silicon sludge and silica fume

Son

Kang

Kim

2021

Journal of Asian Ceramic Societies

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In this study, waste silica fume was used as the raw material for manufacturing porous ceramics, and its mechanical and thermal properties required for application as thermal insulators were studied. For pore formation with direct foaming, Si sludge (0.01, 0.05, and 0.1 wt%) and NaOH aqueous solution (14 N) were used as the foaming agents. The porous ceramics sintered at 900°C showed an apparent porosity of 85.9-89.8%, and the specimen with 0.1 wt% Si sludge showed the highest apparent porosity of 89.8% and a bulk density of 0.24 g/cm 3 . Scanning electron microscopy results showed that with increasing Si sludge substitution, an open pore structure was formed because of the increase in the pore size from several tens to several hundreds of micrometers. The compressive strength decreased from 3.82 to 2.11 MPa as the amount of added Si sludge increased from 0.01 to 0.1%, respectively. The thermal conductivity was less than 1.0 W•m −1 •K −1 in the temperature range of 25-800°C, and the specimen with 0.1 wt% Si sludge showed a low thermal conductivity of 0.2-0.6 W•m −1 •K −1 . The thermal expansion coefficients were 17.1-22.4 × 10 −6 /K in the temperature range of 25-800°C.

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“…An in-depth analysis for the equivalent circuit selection, and data fitting, on various LiBs and super capacitor applications can be found in previous work from our colleagues. [47][48][49][50][51] Here, impedance data was acquired at the end of each discharge and charge sequence for the three formation cycles within each protocol. As shown in Nyquist Plots of PEIS, Figure 2, the diameter of semicircles indicates the F I G U R E 2 Nyquist plots measured after formation charge cycles for cells subject to, A, P1, B, P2, and C, P3; and after formation discharge cycles for, D, P1, E, P2, and F, P3 charge transfer resistance (Rct) at the double layers.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, a voltage signal of 10 mV was used within a frequency range 10 kHz to 10 MHz. An in‐depth analysis for the equivalent circuit selection, and data fitting, on various LiBs and super capacitor applications can be found in previous work from our colleagues 47‐51 . Here, impedance data was acquired at the end of each discharge and charge sequence for the three formation cycles within each protocol.…”

Section: Resultsmentioning

confidence: 99%

Beyond cell parameters: Exploiting cell operation towards optimizing the SEI and suppressing dendrite growth on lithium metal anodes

et al. 2020

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Lithium metal electrodes are regarded as the optimal anode for next generation lithium ion batteries especially in the lithium-sulfur architecture. Unfortunately, the lithium metal anode falls subject to several challenges such as dendrite formation and low Coulombic efficiency, which inhibit its candidacy as a viable technology. As such, substantial research efforts alter cell parameters in effort to manipulate interfacial chemistries, mitigate dendrite growth, and improve cyclability. Unlike conventional efforts, we demonstrate a practical cell operation approach to reinforce the Solid Electrolyte Interphase in lithium anodes via a refined formation protocol governed by the redox reactions found in lithium-sulfur systems. Galvanostatic and electrochemical impedance data on Li-Li symmetrical cells reveal that cell operation during the formation phase plays a critical role on interface stability of lithium metal anodes. Li-Li symmetrical cells subject to our refined protocol, P2, displayed advantages in steadily enduring high cycling currents of 6 mA with minimal polarization, and in lowering the charge transfer resistance at the cell interfaces by a fourfold when compared to cells subject to conventional formation protocols. Additionally, scanning electron microscopy images demonstrate that our formation protocol significantly minimizes the size and dispersion of lithium dendrites, as well as the degree of plated lithium. These effects are enabled by the reinforced SEI formed during P2 which offers a stable ratio between the rates of lithium intercalation to lithium deposition. Microcomputerized tomography characterization further supports these findings by revealing that P2 averts dendrite nucleation sites, and yields greater quantity of SEI species, encompassing 41.1% volume of the entire anode, compared to just 21.5% from the common formation protocol found in literature. Overall, this approach deviates from the convention of materials exploration yet highlights the importance of understanding the nature of interfacial chemistries in response to cell operation. We believe the Daisy Patino and Bo Dong contributed equally to this work.

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Kinetics and electrochemical evolution of binary silicon–polymer systems for lithium ion batteries

Abstract: The kinetics and evolution of binary silicon–polymer systems have been systematically studied for electrochemical energy storage.

Cited by 33 publications

References 40 publications

High‐Potential Metalless Nanocarbon Foam Supercapacitors Operating in Aqueous Electrolyte

High‐Potential Metalless Nanocarbon Foam Supercapacitors Operating in Aqueous Electrolyte

Thermal properties of porous ceramics manufactured by direct foaming using silicon sludge and silica fume

Beyond cell parameters: Exploiting cell operation towards optimizing the SEI and suppressing dendrite growth on lithium metal anodes

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