scholarly journals Electrochemical Properties and Structure Evolution of Starch-Based Carbon Nanomaterials as Li-Ion Anodes with Regard to Thermal Treatment

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1527 ◽  
Author(s):  
Marcelina Kubicka ◽  
Monika Bakierska ◽  
Krystian Chudzik ◽  
Małgorzata Rutkowska ◽  
Joanna Pacek ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Electrochemical Properties ◽  
Carbon Nanomaterials ◽  
Electrochemical Impedance ◽  
Structure Evolution ◽  
Carbon Aerogels ◽  
Electrochemical Characteristics ◽  
Li Ion ◽  
Working Parameters ◽  
Carbon Anodes

The influence of the pyrolysis temperature on the structural, textural, and electrochemical properties of carbon aerogels obtained from potato, maize, and rice starches was analyzed. The carbonization of organic precursors, followed by gelatinization, exchange of solvent, and drying process, was carried out in an argon atmosphere at temperatures ranging from 600 °C to 1600 °C. The nanostructured carbons were characterized by X-ray powder diffraction (XRD) as well as N2-adsorption/desorption (N2-BET) methods. The electrochemical behavior of Li-ion cells based on the fabricated carbon anodes was investigated using the galvanostatic charge/discharge tests (GCDT) and electrochemical impedance spectroscopy (EIS). The results show that the thermal treatment stage has a crucial impact on the proper formation of the aerogel material’s porous structures and also on their working parameters as anode materials. The highest relative development of the external surface was obtained for the samples pyrolysed at 700 °C, which exhibited the best electrochemical characteristics (the highest specific capacities as well as the lowest charge transfer resistances).

scholarly journals Nitrogen-Doped Carbon Aerogels Derived from Starch Biomass with Improved Electrochemical Properties for Li-Ion Batteries

2021 ◽  
Vol 22 (18) ◽  
pp. 9918
Author(s):  
Marcelina Kubicka ◽  
Monika Bakierska ◽  
Krystian Chudzik ◽  
Michał Świętosławski ◽  
Marcin Molenda
Keyword(s):  
Electrochemical Properties ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Potato Starch ◽  
Specific Capacity ◽  
Carbon Aerogel ◽  
Carbon Aerogels ◽  
Modern World ◽  
X Ray ◽  
Li Ion

Among all advanced anode materials, graphite is regarded as leading and still-unrivaled. However, in the modern world, graphite-based anodes cannot fully satisfy the customers because of its insufficient value of specific capacity. Other limitations are being nonrenewable, restricted natural graphite resources, or harsh conditions required for artificial graphite production. All things considered, many efforts have been made in the investigation of novel carbonaceous materials with desired properties produced from natural, renewable resources via facile, low-cost, and environmentally friendly methods. In this work, we obtained N-doped, starch-based carbon aerogels using melamine and N2 pyrolysis as the source of nitrogen. The materials were characterized by X-ray powder diffraction, elemental analysis, X-ray photoelectron spectroscopy, galvanostatic charge–discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy. Depending on the doping method and the nitrogen amount, synthesized samples achieved different electrochemical behavior. N-doped, bioderived carbons exhibit far better electrochemical properties in comparison with pristine ones. Materials with the optimal amount of nitrogen (such as MCAGPS-N8.0%—carbon aerogel made from potato starch modified with melamine and CAGPS-N1.2%—carbon aerogel made from potato starch modified by N2 pyrolysis) are also competitive to graphite, especially for high-performance battery applications. N-doping can enhance the efficiency of Li-ion cells mostly by inducing more defects in the carbon matrix, improving the binding ability of Li+ and charge-transfer process.

scholarly journals The Temperature Effect on the Electrochemical Performance of Sulfur-Doped LiMn2O4 in Li-Ion Cells

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1722
Author(s):  
Marcelina Kubicka ◽  
Monika Bakierska ◽  
Michał Świętosławski ◽  
Krystian Chudzik ◽  
Marcin Molenda
Keyword(s):  
Electrochemical Impedance ◽  
Electrochemical Characteristics ◽  
Galvanostatic Charge ◽  
Spinel Limn2o4 ◽  
Environmental Friendliness ◽  
Discharge Rates ◽  
Influence Of Temperature On ◽  
Li Ion ◽  
Working Parameters ◽  
Charge Discharge

The application of modified spinel materials in commercial systems relates to the verification of their parameters under different conditions. Hence, in this study, the influence of temperature on the electrochemical behavior of sulfur-doped spinel (LiMn2O3.97S0.03), with reference to stoichiometric spinel (LiMn2O4), was investigated. The electrochemical characteristics of Li-ion cells based on the fabricated spinels were investigated using galvanostatic charge–discharge tests (GCDT), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results show that introducing sulfur into the spinel structure improves the electrochemical properties at each of the studied temperatures (3, 22 and 61 °C). LiMn2O3.97S0.03 exhibits higher specific capacities, enhanced diffusivity and charge–discharge rates (particularly at low temperatures), and much better cycling stability, regardless of the testing conditions. Our research proves that an S-doping system is a better alternative to LiMn2O4 in the context of working parameters, while maintaining environmental friendliness and low manufacturing costs.

Synthesis and Electrochemical Properties of Spherical LiFePO4/C Composite via Spray Drying

2015 ◽  
Vol 1120-1121 ◽  
pp. 554-558 ◽  
Author(s):  
Juan Mei Wang ◽  
Bing Ren ◽  
Ying Lin Yan ◽  
Qing Zhang ◽  
Yan Wang
Keyword(s):  
Diffusion Coefficient ◽  
Electrochemical Properties ◽  
Spray Drying ◽  
Electrochemical Impedance ◽  
Retention Rate ◽  
Lithium Ion ◽  
Constant Current ◽  
Ion Diffusion ◽  
Electrochemical Tests ◽  
Li Ion

In this work, spherical LiFePO4/C composite had been synthesized by co-precipitation and spray drying method. The structure, morphology and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), transmission electron microscope (TEM), constant current charge-discharge tests and electrochemical impedance spectroscopy (EIS) tests. The spherical LiFePO4/C particles consisted of a number of smaller grains. The results showed that the morphology of LiFePO4/C particles seriously affected the Li-ion diffusion coefficient and electrochemical properties of lithium ion batteries. Electrochemical tests revealed the spherical LiFePO4/C composite had excellent Li-ion diffusion coefficient which was calculated to be 1.065×10-11 cm2/s and discharge capacity of 149 (0.1 C), 139 (0.2 C), 133 (0.5 C), 129 (1 C) and 124 mAhg-1(2 C). After 50 cycles, the capacity retention rate was still 93.5%.

scholarly journals Electrochemical properties of Fe2O3 electrode in alkaline solution containing K2S additive

2018 ◽  
Vol 34 (2) ◽  
Author(s):  
Thi Hang Bui
Keyword(s):  
Electrochemical Properties ◽  
Alkaline Solution ◽  
Reaction Rate ◽  
Electrochemical Impedance ◽  
Electrochemical Characteristics ◽  
Fe2o3 Nanoparticles ◽  
Air Battery ◽  
Size And Morphology ◽  
Battery Anode ◽  
Scanning Electron

To find the suitable materials for Fe/air battery anode, in this study Fe2O3 electrodes were prepared using Fe2O3 nanoparticles. The size and morphology of Fe2O3 material were observed by scanning electron microscope (SEM). The electrochemical properties of the Fe2O3 electrode in alkaline solution were investigated by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The effects of K2S additive in electrolyte solution on the electrochemical characteristics of Fe2O3 electrodes were also investigated. The obtained results show that the additive strongly affected on the impedance, redox reaction rate and cyclability of Fe2O3 electrode

scholarly journals MODERN RESEARCH METHODS OF PHYSICOCHEMICAL AND ELECTROCHEMICAL PROPERTIES OF ELECTROLYTES IN FOR Li-ION BATTERIES AND HYBRID SUPERCAPACITIES

2021 ◽  
Vol 87 (6) ◽  
pp. 82-96
Author(s):  
Viktor Diamant
Keyword(s):  
Thermal Stability ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Properties ◽  
Power Density ◽  
Electrochemical Impedance ◽  
Aqueous Electrolytes ◽  
Li Ion Batteries ◽  
Power Sources ◽  
Li Ion

In review examineі base properties of modern non-aqueous electrolytes for li-ion batteries and hybrid supercapacities taking part in the formation of power density, electrochemical and thermal stability. Discussed such aspects as the electrolytes functions in electrochemical power sources, physicochemical and electrochemical properties of electrolytes for supercapacitors, the physicochemical and electrochemical properties of electrolytes for primary and secondary batteries, and methods of electrolytes research. As the base methodі for electrolytes studies considered: electrochemical impedance spectroscopy, voltammetry, amperometry, viscosimetry, and combined Ramman spectroscopy.  

Physicochemical and Electrochemical Properties of Aisi 316L Stainless Steel Used for Implants in Human Urinary System

2013 ◽  
Vol 58 (2) ◽  
pp. 625-630 ◽  
Author(s):  
W. Walke ◽  
J. Przondziono
Keyword(s):  
Stainless Steel ◽  
Electrochemical Properties ◽  
316L Stainless Steel ◽  
Electrochemical Impedance ◽  
Electrochemical Characteristics ◽  
Urinary System ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Test Pieces ◽  
Modified Surface

The main purpose of this study was to evaluate physicochemical and electrochemical properties of AISI 316L stainless steel with modified surface, used for implants in human urinary system. In order to simulate conditions, which occur in the tissue environment of the urinary system, the test pieces were exposed in a urinary solution at temperature of T=37 ±1ºC, for a period of 30 days. Evaluation of physicochemical properties of biomaterial was made on the basis of surface chemical analysis (XPS). To evaluate the effects which occur on the surface of the examined steel, Electrochemical Impedance Spectroscopy (EIS) method was also employed. Analysis of test results shows favourable influence of the suggested surface treatment of AISI 316L stainless steel. Samples having electrolytically polished and chemically passivated surface featured the best physicochemical and electrochemical characteristics.

Correlation of Electrochemical Properties and Pore Structure for Carbon Nanoarchitectures with Ultrathin, Conformal Poly(o-Methoxyaniline) Coatings

2006 ◽  
Vol 45 ◽  
pp. 1885-1889
Author(s):  
Jeffrey W. Long
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Pore Structure ◽  
Electrochemical Properties ◽  
Polymer Coating ◽  
Electrochemical Impedance ◽  
Electroactive Polymer ◽  
Carbon Aerogels ◽  
Electrode Structure ◽  
Before And After

We use carbon aerogels and nanofoams as conductive, ultraporous platforms onto which ultrathin (<5-nm thick) conformal poly(o-methoxyaniline) coatings are applied using self-limiting electrodeposition. The electroactive polymer coating is incorporated to increase the overall chargestorage capacity of the resulting hybrid electrode structure. Nitrogen-sorption techniques are used to characterize the carbon nanoarchitecture pore structure before and after application of the polymer coating. The subtle modifications of the carbon nanoarchitecture with the polymer coating are correlated with the resulting electrochemical properties, as determined by cyclic voltammetry and electrochemical impedance spectroscopy.

Influence of VC and FEC Additives on Interphase Properties of Carbon in Li-Ion Cells Investigated by Combined EIS & EQCM-D

2020 ◽  
Author(s):  
Paul Kitz ◽  
Matthew Lacey ◽  
Petr Novák ◽  
Erik Berg
Keyword(s):  
Electrochemical Impedance ◽  
Solid Electrolyte Interphase ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Gas Analysis ◽  
Side Reactions ◽  
Ion Diffusion ◽  
Battery Cell ◽  
Anode Passivation ◽  
Order Of Magnitude ◽  
Li Ion

<div>The electrolyte additives vinylene carbonate (VC) and fluoroethylene carbonate (FEC) are well known for increasing the lifetime of a Li-ion battery cell by supporting the formation of an effective solid electrolyte interphase (SEI) at the anode. In this study combined simultaneous electrochemical impedance spectroscopy (EIS) and <i>operando</i> electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) are employed together with <i>in situ</i> gas analysis (OEMS) to study the influence of VC and FEC on the passivation process and the interphase properties at carbon-based anodes. In small quantities both additives reduce the initial interphase mass loading by 30 to 50 %, but only VC also effectively prevents continuous side reactions and improves anode passivation significantly. VC and FEC are both reduced at potentials above 1 V vs. Li<sup>+</sup>/Li in the first cycle and change the SEI composition which causes an increase of the SEI shear storage modulus by over one order of magnitude in both cases. As a consequence, the ion diffusion coefficient and conductivity in the interphase is also significantly affected. While small quantities of VC in the initial electrolyte increase the SEI conductivity, FEC decomposition products hinder charge transport through the SEI and thus increase overall anode impedance significantly. </div>

The study of the electrochemical properties of zinc-rich coating on the base of water sodium silicate

2019 ◽  
Vol 24 (4) ◽  
pp. 51-58
Author(s):  
Le Hong Quan ◽  
Nguyen Van Chi ◽  
Mai Van Minh ◽  
Nong Quoc Quang ◽  
Dong Van Kien
Keyword(s):  
Carbon Steel ◽  
Electrochemical Properties ◽  
Sodium Silicate ◽  
Cathodic Protection ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Electrical Contact ◽  
Electrochemical Impedance Spectra ◽  
Pure Zinc ◽  
Electric Circuits

The study examines the electrochemical properties of a coating based on water sodium silicate and pure zinc dust (ZSC, working title - TTL-VN) using the Electrochemical Impedance Spectra (EIS) with AutoLAB PGSTAT204N. The system consists of three electrodes: Ag/AgCl (SCE) reference electrode in 3 M solution of KCl, auxiliary electrode Pt (8x8 mm) and working electrodes (carbon steel with surface treatment up to Sa 2.5) for determination of corrosion potential (Ecorr) and calculation of equivalent electric circuits used for explanation of impedance measurement results. It was shown that electrochemical method is effective for study of corrosion characteristics of ZSC on steel. We proposed an interpretation of the deterioration over time of the ability of zinc particles in paint to provide cathodic protection for carbon steel. The results show that the value of Ecorr is between -0,9 and -1,1 V / SCE for ten days of diving. This means that there is an electrical contact between the zinc particles, which provides good cathodic protection for the steel substrate and most of the zinc particles were involved in the osmosis process. The good characteristics of the TTL-VN coating during immersion in a 3,5% NaCl solution can also be explained by the preservation of corrosive zinc products in the coating, which allows the creation of random barrier properties.

scholarly journals Electrochemical Properties of Lipid Membranes Self-Assembled from Bicelles

Membranes ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 11
Author(s):  
Damian Dziubak ◽  
Kamil Strzelak ◽  
Slawomir Sek
Keyword(s):  
Electrochemical Properties ◽  
Self Assembly ◽  
Lipid Membranes ◽  
Lipid Membrane ◽  
Membrane Resistance ◽  
Electrochemical Characteristics ◽  
Freeze Thaw ◽  
Lipid Films ◽  
Supported Lipid Membranes

Supported lipid membranes are widely used platforms which serve as simplified models of cell membranes. Among numerous methods used for preparation of planar lipid films, self-assembly of bicelles appears to be promising strategy. Therefore, in this paper we have examined the mechanism of formation and the electrochemical properties of lipid films deposited onto thioglucose-modified gold electrodes from bicellar mixtures. It was found that adsorption of the bicelles occurs by replacement of interfacial water and it leads to formation of a double bilayer structure on the electrode surface. The resulting lipid assembly contains numerous defects and pinholes which affect the permeability of the membrane for ions and water. Significant improvement in morphology and electrochemical characteristics is achieved upon freeze–thaw treatment of the deposited membrane. The lipid assembly is rearranged to single bilayer configuration with locally occurring patches of the second bilayer, and the number of pinholes is substantially decreased. Electrochemical characterization of the lipid membrane after freeze–thaw treatment demonstrated that its permeability for ions and water is significantly reduced, which was manifested by the relatively high value of the membrane resistance.

Sign in / Sign up

Export Citation Format

Share Document