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Cobalt hydroxide nanosheets have been synthesized via facile and affordable simple chemistry route without any additives for structure design. Co(OH)2 nanosheets exhibit a maximum specific capacity of 111 C g−1 at a current density of 0.5 A g−1. Asymmetric supercapacitor (Co(OH)2//AC) has been fabricated and it delivers the specific capacitance of 34 F g−1 with the power density of 300 W kg−1 at a...
LiFePO4 is a promising cathode material for lithium-ion batteries, but its inferior tap density leads to low-volumetric energy density of Li-ion batteries. This work reports that lithium amount can tune the particle-size distribution and tap density of the Li1 + xFePO4/C (x = 0–0.16) composites prepared via a wet chemistry method followed by carbon thermal reduction reaction. Excess lithium effectively...
A biopolymer electrolyte consisting of iota-carrageenan (I-Carrageenan) and LiCl is prepared using solution casting method. XRD analysis confirms the enhancement in amorphous nature of the prepared polymer electrolytes due to the incorporation of LiCl. Fourier transform infrared (FTIR) spectroscopy is used to analyze the complexation of electrolytes. Electrochemical impedance spectroscopy is utilized...
Amorphous Ni (OH)2 nanobox-like materials were synthesized using Cu2O as template. Ni (OH)2/reduced graphene oxide (Ni (OH)2/rGO) composites were prepared by a simple hydrothermal method. The results obtained from field emission scanning electron microscopy and transmission electron microscopy indicated that the Ni (OH)2 nanobox structure broke into small pieces of 50–100 nm under high temperature...
To improve the chemical stability and acid doping levels of proton exchange membranes, a series of sulfonated polybenzimidazole multiblock copolymers containing pyridine rings (sPBI40-b-PyPBI5-b-PIx) was synthesized. All the copolymers exhibited excellent solubility. The proton exchange membranes were prepared using a solvent casting method. All the membranes were characterized by thermal stability,...
The performance of LiFePO4 (LFP)/graphite batteries would decline during floating-charge and cycling aging. The main aging factors are same for these two application modes. However, there are differences between the aging rates, aging factors on positive, and negative electrodes when batteries undergone floating-charge and cycling mode. In this work, LFP/graphite batteries were assembled and tested...
Four types of mesoporous Na2Ti3O7 (NTO) microspheres have been successfully prepared utilizing different concentrations of NaOH treatment. The specific surface areas and pore size distributions of NTO can be well controlled by means of adjusting the amount of NaOH additives. In the meanwhile, the corresponding electrochemical performance has been detected and analyzed. It is concluded that the 3 M-NTO...
A novel boron-doped porous carbon (BC) was prepared through a facile one step pyrolysis process by using citric acid monohydrate, boron acid, and sodium chloride hybrid as precursor. Based on the analysis of X-ray photoemission spectroscopy and Raman spectroscopy, three boron-doping species (BC3, BC2O, and BCO2) were doped in the carbon lattice. The BC2O and BCO2 can generate abundant extrinsic defects...
The Li4Ti5O12/polyaniline and Li4Ti5O12/С/polyaniline composite materials with different lithium titanate/aniline ratio of 8:1, 4:1, 2:1, 1:1, 1:2, and 1:4 were synthesized by in situ polyaniline (PANI) polymerization. The materials were characterized by high-resolution TEM, X-ray powder diffraction, IR spectroscopy, and TGA. It was shown that polyaniline is uniformly distributed over the surface...
An activated carbon was prepared using physical activation from date stone. This activated carbon was characterized by SEM, XRD, and FT-IR. This composite was used as modifier of carbon paste electrode (AC/CPE) for electrochemical determination of catechol (CC) and hydroquinone (HQ) using cyclic voltammetry. The electrochemical experiments indicated that the modified electrodes can simultaneously...
In order to improve the universality of LiMn2O4 materials, LiMn2O4 coated with Al2O3 (LMO@Al) is prepared by a co-precipitated method to improve the electrochemical performance of the porous LiMn2O4 cathode. The morphologies and microstructures are characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, and energy-dispersive spectroscopy. The electrochemical...
An electrochemical sensor for simultaneous determination of the tryptamines, serotonin (ST) and melatonin (MT) has been developed based on immobilizing acetylene black nanoparticles-chitosan (AB-C) on gold electrode. AB-C exhibited remarkable electro-catalytic activity and enabled effective resolution as well as simultaneous determination of ST and MT under optimal conditions. The electro-catalytic...
In order to enhance the electrochemical performance of LiNi0.5Co0.2Mn0.3O2 (NCM), an in situ doping with zirconium (Zr) by wet grind-solid state method then coating with Li2O-2B2O3 (LBO) by crystal phase selection method is successfully developed. At the same time, based on the density functional theory (DFT) with the generalized gradient approximation (GGA), use of the first-principle calculation...
In this study, a co-precipitation method was used for the synthesis of undoped ferrites (Fe2O3/Fe3O4-R) and nickel-doped ferrites from nickel reagents (NiFe2O4-R) and from nickel recycled from spent Ni-MH batteries (NiFe2O4-B). Ferrite structure and composition were confirmed by X-ray diffraction and inductively coupled plasma optical emission spectrometry. Energy dispersive X-ray analysis showed...
Impedance spectroscopy is a powerful experimental technique for complex analyses of electrical response of conducting samples. Experimental setups consist of a wide variety of analyzers and temperature controllers for high and low temperatures, and the experiments may last for days. In this paper, a self-developed controlling software written in C++ and working under GNU Linux that co-operates with...
Application of polymer-salt composite in multifaceted modes viz. as electrolyte, dielectric etc. demands its stability in extreme environmental conditions of high energy radiation zones. The present study reports the behavior of poly (ethylene oxide) [PEO] – (polyvinylidene fluoride) [PVDF]-KBr composite perturbed by swift heavy ion (SHI) irradiation in the range of tens of MeV. Least conducting PEO-PVDF-KBr...
Solid polymer electrolytes (SPEs) have attracted ever increasing attention due to their huge potential applications in all-solid-state Li-ion batteries. High ionic conductivity and large extended electrochemical stability of SPEs are crucial for the high performance of Li-ion batteries. In this article, we demonstrate the effects of PVAc in P(VdF-HFP)-LiTFSI-EC complex, resulting in blend solid polymer...
La2O3-coated LiNi1/3Mn1/3Co1/3O2 has been successfully synthesized via a wet chemical process followed. The 3 wt% La2O3-coated LiNi1/3Mn1/3Co1/3O2 illustrated highest rate capability, lowest voltage decay, outstanding cycling performance, and excellent energy density at the range of 2.5–4.5 V. The discharge capacity of LiNi1/3Mn1/3Co1/3O2 at a 5C rate increases from 86.9 to 137.5 mA h g−1 upon coating...
The purpose of this study is to select a common commercial Mg alloy to function as an anode for Mg-air batteries, with low anode passivation and minimal hydrogen evolution-induced corrosion being desirable characteristics. Corrosion and discharge performance of 3N5 Mg, AZ31, AZ61, and AZ91 alloys was studied. Corrosion susceptibility decreases and anode utilization factor gradually increases with...
Thermal runaway is a major issue facing widespread adaptation of lithium-ion batteries. To achieve safe, thermally stable energy storage, various approaches have been proposed to regulate exothermic electrochemical reactions at high temperature, yet these have could only be either applied in aqueous systems or impractical in large-format cells. In this communication, we demonstrate that a copolymer,...
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