scholarly journals Synthesis of Ni(OH)2, suitable for supercapacitor application, by the cold template homogeneous precipitation method

2021 ◽  
Vol 2 (6 (110)) ◽  
pp. 45-51
Author(s):  
Vadym Kovalenko ◽  
Valerii Kotok
Keyword(s):  
Energy Consumption ◽  
Nickel Hydroxide ◽  
Specific Capacity ◽  
Active Surface ◽  
High Energy ◽  
Spherical Particles ◽  
Precipitation Method ◽  
Electrochemical Characteristics ◽  
Homogeneous Precipitation ◽  
Supercapacitor Application

α-Ni(OH)2 obtained by template homogeneous precipitation exhibits high electrochemical activity in supercapacitors. The main disadvantage is the high energy consumption for maintaining a high temperature during synthesis. To reduce energy consumption, it is proposed to lower the synthesis temperature. In the study, α-Ni(OH)2 was obtained by the method of cold template homogeneous precipitation using Culminal C8465 (0.5 %) as a template for 6 months at t=20–35 °С. The electrochemical characteristics of the sample were studied by cyclic voltammetry and galvanostatic charge-discharge cycling of a pasted binder-free electrode made without introducing an external binder in the supercapacitor mode. It was determined that low-crystalline α-Ni(OH)2 was formed, consisting of agglomerates of spherical particles. Low specific characteristics of nickel hydroxide were revealed at the beginning of cycling due to blocking of the active surface. It was shown that the specific capacity of the sample increased with further cycling due to the breakdown of aggregates into smaller particles; specific capacities of 80 F/g and 38 mA⋅h/g were obtained. However, the lack of binding properties of the template residues was revealed, resulting in a decrease in specific characteristics. It was concluded that it was necessary to introduce an external binder. A previously undescribed effect of a significant increase in the specific capacity during drying of an alkali-impregnated electrode caused by the disintegration of particle agglomerates during alkali carbonization (the maximum capacity is 135 F/g and 69 mA⋅h/g) was revealed. It was concluded that using the revealed effect of any nickel hydroxide samples obtained by various methods of bulk template synthesis was promising

Preparation and Study of Spherical Nickel Hydroxide Coated by Cobalt Oxy-Hydroxide

2013 ◽  
Vol 668 ◽  
pp. 383-387 ◽  
Author(s):  
Xin Gang Hou ◽  
Wen Wu Liu ◽  
Cai Xia Li ◽  
You Fu Wang
Keyword(s):  
Nickel Hydroxide ◽  
Active Material ◽  
Specific Capacity ◽  
Chemical Precipitation ◽  
Constant Current ◽  
Precipitation Method ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
Constant Current Charge ◽  
Discharge Test

Nanometer nickel hydroxide particles coated by cobalt oxy-hydroxide are prepared through chemical precipitation method. The properties of coated Ni(OH)2 particles is characterized by using X-ray diffraction, scanning electron microscopy, constant current charge/discharge test and cyclic voltammetry. Studies are focused on the effects of different amounts of cobalt oxy-hydroxide on structure and electrochemical characteristics of nickel hydroxide. The results show that a structure of β-Ni(OH)2 is preserved and 2.5 wt % CoOOH can form a well distributed conductive network on the surface of nickel hydroxide particles, thereby leading to higher utilization of active material; Compared to other electrodes, the electrodes with 2.5 wt % coated CoOOH show higher specific capacity and better cycling durability, and the electrodes also has better reversibility of the Ni(OH)2/NiOOH redox couple, and higher oxygen evolution potential.

scholarly journals Preparation of spherical LiNi0.5Mn1.5O4 with core-multilayer shells structure by co-precipitation method and long cycle performance

2020 ◽  
Vol 213 ◽  
pp. 01011
Author(s):  
Guo-Jiang Zhou ◽  
Tao Yu ◽  
Yang Zhou ◽  
Li-Guo Wei
Keyword(s):  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Solid Particles ◽  
High Energy Density ◽  
Cycle Performance ◽  
Precipitation Method ◽  
Xps Spectra ◽  
Long Cycle ◽  
Co Precipitation

As a promising cathode material for lithium ion battemensionalry of high voltage, spinel LiNi0.5Mn1.5O4 has attracted interest due to its high discharging voltage at 4.7 V and high energy density of 610 Wh kg-1. In this work, LiNi0.5Mn1.5O4 with a new core-multilayer shells structure (LNMO-900) is synthesized successfully by co-precipitation method and shows a better electrochemical performance. The formation of the core-multilayer shells structure is related to the kirkendall effect, the shell maintains structural stability, and improves long cycle performance. Core-multilayer shells structure is also beneficial for transmission of lithium ion, increasing rate performance. The effects of sintering temperature on the performance of LNMO were further investigated. Core-multilayer shells LiNi0.5Mn1.5O4 is synthesized successfully at 900 °C for 12 h uniquely. From the integral calculation of XPS spectra, a higher content of Mn4+ is observed in the outer shell of LNMO-900 compared with other homogeneous solid particles. The discharge specific capacity of LNMO-900 is 129.3 mAh g-1 at 1 C which is superior to others, and after 1000 cycles, LNMO-900 shows capacity retention of 87.9%. The initial capacity of LNMO-900 is 104.9 mAh g-1 at 5 C.

scholarly journals The Development of Si Anode Materials by Nanotechnology for Lithium-ion Battery

2021 ◽  
Vol 308 ◽  
pp. 01007
Author(s):  
Minghao He ◽  
Mingzhao Li ◽  
Zeyu Sun
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Low Cost ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Commercial Application ◽  
Electrochemical Characteristics ◽  
Discharge Performance

Nowadays, lithium-ion batteries (LIBs) are applied in many fields for their high energy density, low cost, and long cycle life, highly appreciated in a commercial application. Anode materials, a vital factor contributing to high specific capacity, have caught great attention in next-generation LIBs development. Silicon (Si) has been generally considered one of the best substitutes for the commercial carbon-based anodes of lithium-ion batteries due to its extremely high theoretical capacity, excellent charge-discharge performance, and low cost compared with other anode materials. In this review, various silicon-based materials, including nanostructured silicon and silicon composite materials, are summarized, and both advantages and challenges are analyzed. The article emphasizes the remarkable electrochemical characteristics and significant improvement of battery performance by applying nanostructure and silicon composites conjugates. Besides, the challenges and outlook on the nanostructure design of Si and silicon composites are presented.

Synthesis and Characterization of Uniform Zirconia Particles by Homogeneous Precipitation Method

2013 ◽  
Vol 32 (4) ◽  
pp. 391-395 ◽  
Author(s):  
Khalida Akhtar ◽  
Ikram Ul Haq ◽  
Uzma Hira
Keyword(s):  
Steel Substrate ◽  
Spherical Particles ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Sem Images ◽  
Experimental Conditions ◽  
Homogeneous Precipitation Method ◽  
Size Uniformity ◽  
Ft Ir ◽  
Micrometer Size

AbstractColloidal spherical particles (micrometer size) of zirconia were synthesized at 50°C by homogeneous precipitation method from aqueous solutions, containing appropriate amounts of zirconium chloride, hydrochloric acid, potassium sulphate and urea. Results revealed that reactants concentration significantly affected characteristics of the precipitated solids, which ranged from gel to dispersion of discrete particles. Size uniformity in the resulted particles was obtained only under limited conditions. SEM images revealed that particles of zirconia obtained under the described experimental conditions have spherical morphology, which maintained their original shape after calcination at 700°C. Selected powders were also characterized with XRD, TGA/DTA, and FT-IR techniques. XRD results showed that as-prepared and calcined powders were crystalline. We believe that our method is simple and has the potential for further tailoring of the particles characteristics. Work is in progress in our laboratory in developing Cu-ZrO2 metal matrix composite coating on steel substrate with better resistant properties than simple Cu electroplating.

Synthesis of Calcium Carbonate Particles Modified by Coating with Nickel Precursor

2005 ◽  
Vol 486-487 ◽  
pp. 546-549 ◽  
Author(s):  
Kyung Nam Kim ◽  
Yong Do Kim
Keyword(s):  
Calcium Carbonate ◽  
Surface Properties ◽  
Nickel Hydroxide ◽  
Pure Water ◽  
Aqueous System ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Homogeneous Precipitation Method ◽  
Forced Hydrolysis ◽  
Homogeneous Decomposition

CaCO3 powders were prepared by the homogeneous precipitation method using CaCl2, urea as the starting materials. Uniform CaCO3(calcite, aragonite, vaterite) powders were obtained by various conditions. The surfaces of CaCO3 powders were modified by coating them with a lithium precursor using two different precipitation techniques: homogeneous decomposition of precipitating agents(urea, NaHCO3, NH4HCO3) and forced hydrolysis in pure water. Selecting the Ni(NO3)26H2O and urea(or NaHCO3, NH4HCO3) as Ni-source and precipitating agent respectively, the NiO could be uniformly coated on the CaCO3 powder in the aqueous system. The coating NiO layer dominated the surface properties of the coated lime powders. Calcination of these nickel hydroxide crystals in air at 500°C transformed them into NiO.

High-Temperature Electrochemical Performance of Amorphous Nickel Hydroxide Codoped with Y and Mg

2012 ◽  
Vol 554-556 ◽  
pp. 390-394
Author(s):  
Chang Jiu Liu ◽  
Wei Shang ◽  
Shi Juan Chen
Keyword(s):  
High Temperature ◽  
Electrochemical Performance ◽  
Nickel Hydroxide ◽  
Discharge Rate ◽  
Specific Capacity ◽  
Structural Features ◽  
Discharge Voltage ◽  
Structural Defects ◽  
Precipitation Method ◽  
Charge Discharge

Amorphous nickel hydroxide codoped with Y and Mg was synthesized by micro-emulsion precipitation method combined with rapid freezing technique. The physical properties and micro-structural features of the prepared sample were characterized and high-temperature electrochemical performance was analyzed by cyclic voltammetry and charge/discharge tests, respectively. The results indicate that this amorphous nickel hydroxide codoped with Y and Mg has more structural defects and better thermal stability, therefore results in a relatively high specific capacity(332.46 mAh•g-1 at a charge/discharge rate of 0.2C) and a high middle discharge voltage of 1.265V at 60°C. Moreover, the Y and Mg codoped amorphous nickel hydroxide exhibits good electrochemical reaction reversibility and structural stability.

Synthesis of Uniform Spherical Alumina Powders by Homogeneous Precipitation

2013 ◽  
Vol 341-342 ◽  
pp. 100-104
Author(s):  
Xiao Juan Xu ◽  
Xu Dong Sun ◽  
Ya Qiu Liang ◽  
Wei Qiu
Keyword(s):  
Ammonium Sulfate ◽  
Aluminum Nitrate ◽  
Spherical Particles ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Homogeneous Precipitation ◽  
Homogeneous Precipitation Method ◽  
Alumina Particles ◽  
Precursor Powders ◽  
Spherical Alumina

Uniform spherical alumina powders have been synthesized via homogeneous precipitation method from aluminum nitrate using urea as the precipitant. The amount of ammonium sulfate has a significant effect on morphology and particle size of the precursor powders. It was found that spherical particles can be obtained when the molar ratio of ammonium sulfate to aluminum nitrate is about 0.72 and the concentration of the aluminum nitrate is 0.005M. Spherical alumina particles with 400 nm in diameter were obtained by calcining the precursors at 1100°C for 4 hrs.

scholarly journals Electrochemical Performance of Delafossite, AgFeO2: A Pseudo-Capacitive Electrode in Neutral Aqueous Na2SO4 Electrolyte

2021 ◽  
Author(s):  
Preetam Singh ◽  
Abhay Narayan Singh ◽  
Rakesh Mondal ◽  
Chandana Rath
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacity ◽  
Negative Electrode ◽  
High Energy ◽  
Channel Structure ◽  
High Energy Density ◽  
Precipitation Method ◽  
Layer Spacing ◽  
Phase Tuning ◽  
Na2so4 Electrolyte

Abstract Layered delafossite AgFeO2 with open channel structure is envisaged as a pseudo capacitor electrode using Fe2+/ Fe3+ redox couple. A simple co-precipitation method was employed for the phase formation of delafossite AgFeO2 resulting in a mixture of 2H and 3R-phase. Phase tuning of 2H phase was done by controlling the calcination conditions and characterizing by powder XRD, FT-IR, and Raman methods. 2H AgFeO2 was used to synthesize as a majority phase because it have the larger inter layer spacing than 3R phase shown. HRTEM study confirms the formation 2H phase in majority. All of the synthesized samples exhibit predominantly faradic battery-type redox behavior along with surface charge storage. Flower like microarchitectures of AgFeO2 show outstanding electrochemical performance with high specific capacity of 110.4 F/g at 1 A/g current density, that retained up to 89% after 2000th times charge/discharge in 1M Na2SO4 electrolyte. In an asymmetric device mode, AFO-400//AC full cell exhibits superior electrochemical performance by delivering high energy density (33.5 Wh/kg) and high power density (454.3 W/kg) with excellent cycling stability (86% retention after 2000th cycles). The results clearly demonstrate that the synthesized delafossite AgFeO2 containing mixture of 2H and 3R-phases have remarkable potential to be used as a negative electrode material for supercapacitor and other energy storage technologies

Role of Nafion in the Electrochemical Characteristics of Zinc Antimonate Nanoparticles for Supercapacitor Application

2017 ◽  
Vol 17 ◽  
pp. 18-23
Author(s):  
M. Balasubramaniam ◽  
S. Balakumar
Keyword(s):  
Sulfonic Acid ◽  
Mechanical Stability ◽  
Electrochemical Impedance ◽  
Acid Group ◽  
Electrochemical Analysis ◽  
Proton Exchange ◽  
Precipitation Method ◽  
Electrochemical Characteristics ◽  
Active Electrode ◽  
Supercapacitor Application

Zinc antimonate (ZnSb2O6) nanoparticles were prepared by an inexpensive chemical precipitation method and its structural properties were studied using X-ray diffraction (XRD). Further in electrochemical analysis, Nafion, a per-fluorinated sulfonic acid polymer solution that serves as a binder, wherein the hydrophilic sulfonic acid group provides proton-exchange between electrolyte and active electrode material thereby, it is beneficial in the improvement of the capacitance, chemical and mechanical stability of a material. Considering this key point, the significance of the nafion on the electrochemical characteristics of zinc antimonate nanoparticles were studied through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis in 1 M H2SO4 electrolyte. The significant changes in the capacitance, electrochemical behavior and electrochemical stability of the nanostructure with and without the binder were investigated.

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