scholarly journals Powder Characterization and Electrochemical Properties of LiNi0.5Mn1.5O4Cathode Materials Produced by Large Spray Pyrolysis Using Flame Combustion

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Shinsuke Akao ◽  
Motofumi Yamada ◽  
Takayuki Kodera ◽  
Kenichi Myoujin ◽  
Takashi Ogihara
Keyword(s):  
Spray Pyrolysis ◽  
Size Distribution ◽  
Discharge Capacity ◽  
Average Diameter ◽  
Cycle Performance ◽  
Narrow Particle Size Distribution ◽  
Capacity Retention ◽  
Flame Combustion ◽  
Broad Size Distribution ◽  
Porous Microstructure

LiNi0.5Mn1.5O4cathode materials were produced by spray pyrolysis apparatus using the flame combustion. SEM revealed that as-prepared powders had spherical morphology with porous microstructure which had an average diameter of about 2 μm with broad size distribution. After the calcination, LiNi0.5Mn1.5O4powders with polygonal morphology and narrow particle size distribution were obtained. XRD showed that LiNi0.5Mn1.5O4was well crystallized after the calcination at 900°C. Rechargeable measurement of LiNi0.5Mn1.5O4cathode showed that the long plateau was observed at 4.7 V in discharge curve of LiNi0.5Mn1.5O4cathode and its discharge capacity was 145 mAh/g at 1 C. The capacity retention of LiNi0.5Mn1.5O4cathode were 95% at 1 C after 100 cycles. The discharge capacity and capacity retention of LiNi0.5Mn1.5O4cathode were 125 mAh/g and 88% at 20 C. LiNi0.5Mn1.5O4cathode exhibited also stable cycle performance at 50C.

Lithium Battery Properties of LiNi0.5Mn1.5O4 Powders Synthesized by Internal Combustion Type Spray Pyrolysis Apparatus Using Gas Burner

2007 ◽  
Vol 350 ◽  
pp. 191-194 ◽  
Author(s):  
Izumi Mukoyama ◽  
Kenichi Myoujin ◽  
Takahiro Nakamura ◽  
Hironori Ozawa ◽  
Takashi Ogihara ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Spinel Structure ◽  
Lithium Battery ◽  
Production Capacity ◽  
Average Diameter ◽  
Internal Combustion ◽  
Cycle Performance ◽  
Different Temperatures ◽  
Porous Microstructure ◽  
Gas Burner

Spherical LiNi0.5Mn1.5O4 powders were prepared by internal combustion type spray pyrolysis apparatus using gas burner. The powder production capacity was 1 kg/h by this equipment. After calcinations of as-prepared powders contained Ni at different temperatures from 800 to 1200 °C in air for 10h, LiNi0.5Mn1.5O4 powders were obtained. As-prepared particles have a porous microstructure with an average diameter of about 5 μm with narrow size distribution. XRD showed that LiNi0.5Mn1.5O4 powders were well crystallized to a spinel structure with Fd3m space group. LiNi0.5Mn1.5O4 powders calcined at 1000°C show good cycle performance with after 30 cycles discharge capacity of 112mAh/g and 95% retention after 400 cycles between 3.5 V and 5 V.

Effects of K in Mn2O3 on the Electrochemical Performances of Spinel Li1.06Mn2O4

2013 ◽  
Vol 773 ◽  
pp. 611-616
Author(s):  
Xing Zou ◽  
Chun Lin Peng
Keyword(s):  
Discharge Capacity ◽  
Retention Rate ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Manganese Carbonate ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Doping Amount ◽  
Capacity Retention ◽  
Initial Discharge

Spinel LiMn2O4 material is one of the lithium-ion battery cathodes. It is cheap, nontoxic, and safe in use. This cathode material, Li1.06Mn2O4 was synthesized by using solid state reaction and two different starting materials. One was the Mn2O3 made from the industrial manganese carbonate with different contents of potassium, and the other was the high-purity Mn2O3 into which the same amount of potassium in the form of K2CO3 was added to form the K-doped spinel Li1.06Mn2O4. These two kinds of LiMn2O4 materials were characterized by XRD, SEM and electrochemical performance analysis. The results showed that the initial discharge capacity of the former cathode materials decreased gradually and the cycle performance was improved with the amount of potassium increasing. The Li1.06Mn2O4 with a content of 192.2 μg.g-1 of potassium presented the optimized electrochemical performances, with an initial discharge capacity of 128.974mAh.g-1, and a capacity retention rate of 89.90% after 50 cycles. The initial discharge capacity of doped Li1.06Mn2O4 dropped rapidly with the doping amount increasing and the capacity retention rate was not as good as that of the Mn2O3 made from the industrial manganese carbonate with different contents of potassium.

Ultra-small-angle X-ray scattering study of second-phase particles in heat-treated Zircaloy-4

2015 ◽  
Vol 48 (1) ◽  
pp. 52-60 ◽  
Author(s):  
Prakash Srirangam ◽  
Yasir Idrees ◽  
Jan Ilavsky ◽  
Mark R. Daymond
Keyword(s):  
Size Distribution ◽  
Volume Fraction ◽  
Average Diameter ◽  
Second Phase ◽  
Air Cooling ◽  
Β Phase ◽  
Heat Treated ◽  
Broad Size Distribution ◽  
Second Phase Particles ◽  
Fine Size

The ultra-small-angle X-ray scattering (USAXS) technique has been used to investigate and to quantify the morphology and size distribution of second-phase particles in Zircaloy-4 under various heat-treatment conditions. The alloy samples were solutionized in the β phase field at 1293 K for 15 min and then cooled at different rates, including water quenching, air cooling and furnace cooling. The water-quenched samples were subsequently subjected to a thermal aging treatment at 873 K for different aging times (30, 60, 120 and 300 min). The USAXS results show that water quenching and air cooling from the β phase field produces a narrow size distribution of fine-size precipitates with an average diameter of 300–800 Å, while furnace cooling resulted in coarsening of the particles, with a broad size distribution having an average precipitate size of 600–1200 Å. Further, the furnace-cooled sample shows a higher volume fraction of particles than the water-quenched or air-cooled sample. The USAXS results on the quenched then aged samples show that aging at 873 K for 10 min resulted in very fine size precipitates with an average diameter of 200–350 Å. A rapid precipitation with the highest number density of second-phase particles amongst all the heat-treated samples (4.3 × 1020 m−3) was observed in the sample aged for 10 min at 873 K. Particles of larger size and with a broad size distribution were observed in the sample aged at 873 K for 300 min. A bimodal type of particle size distribution was observed in all the heat-treated samples. Important parameters in the characterization of second-phase particles, such as the average size, size distribution, volume fraction and number density, were evaluated and quantified. These parameters are discussed for both β heat-treated and aged specimens. Transmission and scanning transmission electron microscopy characterization were carried out on all heat-treated samples, to assist in interpretation and to substantiate the results from the USAXS measurements.

Effect of Nitric Acid Modification on LiMn2O4 Prepared by Solution Combustion Synthesis

2011 ◽  
Vol 80-81 ◽  
pp. 332-336 ◽  
Author(s):  
Yan Xia ◽  
Mei Huang ◽  
Jun Ming Guo ◽  
Ying Jie Zhang
Keyword(s):  
Nitric Acid ◽  
Combustion Synthesis ◽  
Discharge Capacity ◽  
Retention Rate ◽  
Solution Combustion Synthesis ◽  
Manganese Acetate ◽  
Solution Combustion ◽  
Acid Modification ◽  
Capacity Retention ◽  
Liquid Combustion

Effect of nitric acid and the burning time on the liquid combustion synthesis of spinel LiMn2O4 has been studied, using lithium nitrite and Manganese acetate as raw a material. The results show that the main phases are all LiMn2O4, which can be obtained at 400-600 oC. Before modified, the impurity is Mn3O4 or Mn2O3. After modified, the impurity is only Mn3O4. The aggregation obviously reduced after adding nitric acid, it is indicated that the crystalline increased. With the increasing temperatures, the modified particle size was increased and the aggregation reduced. The initial discharge capacity and cycle stability improved at some extent too. Its first discharge capacity was 104.6, 112.8 and 117.7mAh/g synthesized at 400, 500, 600 oC, respectively, and the 30th capacity retention rate were 84.89%, 80.67% and 73.24%.

scholarly journals Construction of Chitosan/Alginate Nano-Drug Delivery System for Improving Dextran Sodium Sulfate-Induced Colitis in Mice

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1884
Author(s):  
Mengfei Jin ◽  
Shangyong Li ◽  
Yanhong Wu ◽  
Dandan Li ◽  
Yantao Han
Keyword(s):  
Self Assembly ◽  
Average Diameter ◽  
Mucosal Healing ◽  
Plga Nanoparticles ◽  
Narrow Particle Size Distribution ◽  
Layer By Layer ◽  
Systemic Side Effects ◽  
Assembly Technology ◽  
The Fourier Transform ◽  
Polyelectrolyte Film

(1) Background: In the treatment of ulcerative colitis (UC), accurate delivery and release of anti-inflammatory drugs to the site of inflammation can reduce systemic side effects. (2) Methods: We took advantage of this goal to prepare resveratrol-loaded PLGA nanoparticles (RES-PCAC-NPs) by emulsification solvent volatilization. After layer-by-layer self-assembly technology, we deposited chitosan and alginate to form a three-layer polyelectrolyte film. (3) Results: It can transport nanoparticles through the gastric environment to target inflammation sites and slowly release drugs at a specific pH. The resulting RES-PCAC-NPs have an ideal average diameter (~255 nm), a narrow particle size distribution and a positively charged surface charge (~13.5 mV). The Fourier transform infrared spectroscopy showed that resveratrol was successfully encapsulated into PCAC nanoparticles, and the encapsulation efficiency reached 87.26%. In addition, fluorescence imaging showed that RES-PCAC-NPs with positive charges on the surface can effectively target and accumulate in the inflammation site while continuing to penetrate downward to promote mucosal healing. Importantly, oral RES-PCAC-NPs treatment in DSS-induced mice was superior to other results in significantly improved inflammatory markers of UC. (4) Conclusions: Our results strongly prove that RES-PCAC-NPs can target the inflamed colon for maximum efficacy, and this oral pharmaceutical formulation can represent a promising formulation in the treatment of UC.

Investigation on the Correlations between Droplet and Particle Size Distribution in Ultrasonic Spray Pyrolysis

2008 ◽  
Vol 47 (5) ◽  
pp. 1650-1659 ◽  
Author(s):  
Wei-Ning Wang ◽  
Agus Purwanto ◽  
I. Wuled Lenggoro ◽  
Kikuo Okuyama ◽  
Hankwon Chang ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Spray Pyrolysis ◽  
Size Distribution ◽  
Ultrasonic Spray Pyrolysis ◽  
Ultrasonic Spray

Green synthesis of submicron copper powder with narrow particle size distribution via a simple methanol thermal reduction

2021 ◽  
Author(s):  
Xiaoping Chen ◽  
Jiaqi Fu ◽  
Jiangang Li ◽  
Bohong Chen ◽  
Lei Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Green Synthesis ◽  
Size Distribution ◽  
Copper Powder ◽  
Reduction Method ◽  
Particle Distribution ◽  
Thermal Reduction ◽  
Narrow Particle Size Distribution

In this work, submicron copper powder with narrow particle distribution was synthesized via a simple methanol thermal reduction method without using any surfactants. Smaller copper powder with narrower particle size...

Organosilicon Comb-Shaped Surfactants for the Synthesis of Polymer Suspensions with a Narrow Particle Size Distribution

2021 ◽  
Vol 63 (3) ◽  
pp. 209-217
Author(s):  
A. A. Ezhova ◽  
I. A. Gritskova ◽  
S. A. Gusev ◽  
S. A. Milenin ◽  
V. V. Gorodov ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Narrow Particle Size Distribution

An inorganic–organic nanocomposite calix[4]quinone (C4Q)/CMK-3 as a cathode material for high-capacity sodium batteries

2017 ◽  
Vol 4 (11) ◽  
pp. 1806-1812 ◽  
Author(s):  
Shibing Zheng ◽  
Jinyan Hu ◽  
Weiwei Huang
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
High Capacity ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Sodium Batteries

A novel high-capacity cathode material C4Q/CMK-3 for SIBs shows an initial discharge capacity of 438 mA h g−1 and a capacity retention of 219.2 mA h g−1 after 50 cycles.

Colloidal synthesis of monodisperse trimetallic IrNiFe nanoparticles as highly active bifunctional electrocatalysts for acidic overall water splitting

2017 ◽  
Vol 5 (47) ◽  
pp. 24836-24841 ◽  
Author(s):  
Luhong Fu ◽  
Gongzhen Cheng ◽  
Wei Luo
Keyword(s):  
Synergistic Effect ◽  
Size Distribution ◽  
Water Splitting ◽  
Average Diameter ◽  
Colloidal Synthesis ◽  
Synthetic Method ◽  
Alloy Nanoparticles ◽  
Narrow Size Distribution ◽  
Acidic Media ◽  
Highly Active

Monodisperse IrNiFe alloy nanoparticles with an average diameter of 2.2 nm have been synthesized by a colloidal synthetic method. By taking advantage of the synergistic effect between Ir, Ni and Fe and the ultrasmall NPs with narrow size distribution, the as-synthesized IrNiFe catalyst exhibits superior HER/OER performances in acidic media.

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