Electrochemical impedance analysis of polyvinylpyrrolidone-coated sulfur/reduced graphene oxide (S/rGO) electrode

Iskandar, Ferry; Setiawan, Bramianto; Mayangsari, Tirta Rona; Maharsi, Retno; Purwanto, Agus; Aimon, Akfiny Hasdi

doi:10.1088/2053-1591/aaee41

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…In addition to exploring the electrode/electrolyte interface, the change of the electrolyte system is also critical to understanding the mechanism of the Li−S system. In situ UV−visible absorption spectroscopy was employed to track the variation of various dissolved LiPS species generated from Considering the strong relationship between the electrochemical performance of Li−S batteries and the interfacial charge-transfer and mass-transfer processes and lithium-ion diffusion in the cathode materials, EIS measurements were performed for the four cathodes after cycling for different cycles at 1 C. 58,59 To better analyze the EIS results, the electrolyte resistance (R e ), charge-transfer resistance (R ct ), and mass-transfer resistance (R mt ) parameters were determined by calculating each impedance spectrum in Figure 5e and Figure S15 with the corresponding equivalent circuits, 60,61 and presented in Table S3. As observed in Table S3, the R e and R ct values for the four cathodes showed little fluctuation over the span of 5−150 cycles owing to the efficient electronic/ ionic transport between the cathode material and electrolyte.…”

Section: Resultsmentioning

confidence: 99%

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

et al. 2020

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The sluggish reaction kinetics at the cathode/electrolyte interface of lithium–sulfur (Li–S) batteries limits their commercialization. Herein, we show that a dual-regulation system of iron phthalocyanine (FePc) and octafluoronaphthalene (OFN) decorated on graphene (Gh), denoted as Gh/FePc+OFN, accelerates the interfacial reaction kinetics of lithium polysulfides (LiPSs). Multiple in situ spectroscopy techniques and ex situ X-ray photoelectron spectroscopy combined with density functional theory calculations demonstrate that FePc acts as an efficient anchor and scissor for the LiPSs through Fe···S coordination, mainly facilitating their liquid–liquid transformation, whereas OFN enables Li-bond interaction with the LiPSs, accelerating the kinetics of the liquid–solid nucleation and growth of Li2S. This dual-regulation system promotes the smooth conversion reaction of sulfur, thereby improving the battery performance. A Gh/FePc+OFN-based Li–S cathode delivered an ultrahigh initial capacity of 1604 mAh g–1 at 0.2 C, with an ultralow capacity decay rate of 0.055% per cycle at 1 C over 1000 cycles.

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Section: Resultsmentioning

confidence: 99%

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

et al. 2020

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“…Based on the EIS test, the enhancement of the electrochemical performance cause by the reinforcement of the reaction kinetic owing to the reduction of the reaction resistance. [8,19] However, this single static EIS analysis at discharged state is unrepresentative and not strong enough to explain the increased behavior for the entire cycle life of the battery.…”

Section: Resultsmentioning

confidence: 92%

Enhanced Electrochemical Kinetics on Ni₂P Polar Mediators Integrated with Graphene for Lithium–Sulfur Batteries

Cheng

Gao

Zhao

et al. 2022

Adv Materials Inter

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Lithium‐sulfur batteries have evoked intensive attention caused by the urgent requirement of energy storage devices with higher energy density, long cycle life, and low cost. However, the insulating nature and the soluble reaction intermediate products still hinder its large‐scale industry and acceptance by the market. Tremendous efforts focus on the composite of polar material and non‐polar material to solve the weaknesses of material insulating nature and soluble reaction intermediate products. However, the linkage form between these two generic materials has been ignored. In this paper, by using typical Ni2P as polar material and graphene as non‐polar material, the reaction kinetics changes and its intrinsic theories on behavior enhancement have been proved, which construct different binding type between polar and non‐polar materials. The Ni2P/PrGO delivers an improved high specific capacity of 1254.6 mAh g‐1 than Ni2P/rGO at 0.2 C. The relevant X‐ray photoelectron spectroscopy result and the in situ electrochemical impedance spectroscopy tests prove that the linkage state between polar and non‐polar material has strong influence on the sulfur cathode reaction kinetics. The enhanced reaction kinetics and polar adsorption behavior bring the soft pack battery testing unit over 150 stable cycles with decay ratio of 0.19% for each cycle.

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“…These spectra in Figure S20a–e in the Supporting Information were analyzed using the equivalent circuit model in Figure S20f in the Supporting Information, where R e is electrolyte resistance, R ct is interfacial charge transfer resistance, and R mt is the mass transportation resistance of the solid‐state layer of the accumulated insoluble Li 2 S 2 /Li 2 S, respectively. [ 32 , 33 ] In Figure S21a in the Supporting Information, the [CNTs–MM–hemin] cathode shows the lowest R e among all the cathodes over cycling, indicating the smallest dissolution of hemin and LiPS into bulk electrolyte owing to the good immobilization effect of [CNTs–MM–hemin] composite to hemin. Meanwhile, the most stable and lowest R ct (Figure S21b , Supporting Information) and R mt (Figure S21c , Supporting Information) are also observed in [CNTs–MM–hemin] cathode, demonstrating sustainable and efficient charge/mass transportation for sulfur redox reactions during long‐term cycling.…”

Section: Resultsmentioning

confidence: 99%

Cofactor‐Assisted Artificial Enzyme with Multiple Li‐Bond Networks for Sustainable Polysulfide Conversion in Lithium–Sulfur Batteries

et al. 2021

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Lithium–sulfur batteries possess high theoretical energy density but suffer from rapid capacity fade due to the shuttling and sluggish conversion of polysulfides. Aiming at these problems, a biomimetic design of cofactor‐assisted artificial enzyme catalyst, melamine (MM) crosslinked hemin on carboxylated carbon nanotubes (CNTs) (i.e., [CNTs–MM–hemin]), is presented to efficiently convert polysulfides. The MM cofactors bind with the hemin artificial enzymes and CNT conductive substrates through FeN5 coordination and/or covalent amide bonds to provide high and durable catalytic activity for polysulfide conversions, while π–π conjugations between hemin and CNTs and multiple Li‐bond networks offered by MM endow the cathode with good electronic/Li+ transmission ability. This synergistic mechanism enables rapid sulfur reaction kinetics, alleviated polysulfide shuttling, and an ultralow (<1.3%) loss of hemin active sites in electrolyte, which is ≈60 times lower than those of noncovalent crosslinked samples. As a result, the Li–S battery using [CNTs–MM–hemin] cathode retains a capacity of 571 mAh g−1 after 900 cycles at 1C with an ultralow capacity decay rate of 0.046% per cycle. Even under raising sulfur loadings up to 7.5 mg cm−2, the cathode still can steadily run 110 cycles with a capacity retention of 83%.

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Electrochemical impedance analysis of polyvinylpyrrolidone-coated sulfur/reduced graphene oxide (S/rGO) electrode

Cited by 6 publications

References 17 publications

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

Enhanced Electrochemical Kinetics on Ni₂P Polar Mediators Integrated with Graphene for Lithium–Sulfur Batteries

Cofactor‐Assisted Artificial Enzyme with Multiple Li‐Bond Networks for Sustainable Polysulfide Conversion in Lithium–Sulfur Batteries

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Electrochemical impedance analysis of polyvinylpyrrolidone-coated sulfur/reduced graphene oxide (S/rGO) electrode

Cited by 6 publications

References 17 publications

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

Enhanced Electrochemical Kinetics on Ni2P Polar Mediators Integrated with Graphene for Lithium–Sulfur Batteries

Cofactor‐Assisted Artificial Enzyme with Multiple Li‐Bond Networks for Sustainable Polysulfide Conversion in Lithium–Sulfur Batteries

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Enhanced Electrochemical Kinetics on Ni₂P Polar Mediators Integrated with Graphene for Lithium–Sulfur Batteries