Preparation of Cathode Materials for a Lithium-Ion Battery Using an Industrial Microwave Furnace

2010 ◽  
Vol 445 ◽  
pp. 113-116 ◽  
Author(s):  
Masashi Higuchi ◽  
Kota Suzuki ◽  
Keiichi Katayama ◽  
Toshiki Nakamura ◽  
Akira Kagohashi ◽  
...  

Cathode materials for a lithium-ion battery were prepared using an industrial microwave furnace. The prepared materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical properties. Single-phase LiMn2O4 powders could be prepared in a few minutes using an industrial microwave furnace. The obtained results showed that this microwave heating method is a promising industrial technique for efficient preparation of cathode materials.

2013 ◽  
Vol 566 ◽  
pp. 99-102 ◽  
Author(s):  
Takumi Ose ◽  
Tomonori Kaga ◽  
Masashi Higuchi ◽  
Keiichi Katayama

Lithium nickel manganese oxide, LiNi0.5Mn1.5O4, a cathode material for lithium-ion batteries was synthesized by a microwave heating method. Synthesized samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical properties. The results revealed that spinel LiNi0.5Mn1.5O4 powders can be directly synthesized by microwave heating. The precursor prepared using 48 to 64 g of PVA solution would be best to synthesize LiNi0.5Mn1.5O4 successfully by microwave heating.


1989 ◽  
Vol 169 ◽  
Author(s):  
Winnie Wong‐Ng ◽  
Lawrence P. Cook ◽  
Michael D. Hill ◽  
Boris Paretzkin ◽  
E.R. Fuller

AbstractThe influence of the ionic size of the lanthanides R on melting relations of Ba2RCu3O6+x, where R=Y, Eu and Nd, was studied and compared with that of a high Tc superconductor mixed‐lanthanide phase Ba2(Y.75Eu.125Nd 125)Cu3O6+xThese materials have been characterized by a variety of methods including differential thermogravimetric analysis (DTA), scanning electron microscopy (SEM) with energy dispersive X‐ray spectroscopy (EDX) and X‐ray powder diffraction. Single phase samples of Ba2(Y.75Eu.125Nd.125)Cu3O6+x were annealed at 1004, 1040, 1052, 1060, 1078, 1107 and 1160°C and quenched into a helium gas container cooled by liquid nitrogen. The SEM micrographs of these samples showed the progressive chnages in features of the microstructures from sintering and grain growth through melting and then recrystallization from the melt. The addition of the SEM technique in conjunction with X‐ray diffraction has been helpful in the study of phase equilibria in this system.


2013 ◽  
Vol 802 ◽  
pp. 119-123
Author(s):  
Supamas Wirunchit ◽  
Rangson Muanghlua ◽  
Supamas Wirunchit ◽  
Wanwilai Vittayakorn ◽  
Naratip Vittayakorn

Nanocrystalline barium zirconium titanate, BaZr0.4Ti0.6O3, was synthesized successfully via the sonochemical process. The effects of reaction time on the precipitation of Ba(Zr,Ti)O3 particles were investigated briefly. The crystal structure as well as molecular vibrations and morphology were investigated. X-ray diffraction indicated that the powders exhibited a single phase perovskite structure, without the presence of pyrochlore or unwanted phases at the reaction time of 60 min. Nanocrystals were formed before being oriented and aggregated into large particles in aqueous solution under ultrasonic irradiation. A scanning electron microscopy (SEM) photograph showed the BZT powder as spherical in shape with uniform nanosized features.


2020 ◽  
Vol 20 (3) ◽  
pp. 1962-1967
Author(s):  
Zhen Liu ◽  
Wei Zhou ◽  
Guilin Zeng ◽  
Yuling Zhang ◽  
Zebin Wu ◽  
...  

Oroxylum as a traditional Chinese medicine, was used as a green and novel bio-template to synthesize tremella-like Li3V2(PO4)3/C composite (LVPC) cathode materials by adopting a facile immersion method. The microstructures were analyzed by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by galvanostatic charge–discharge experiments. The LVPC revealed specific capacity of 95 mAh·g-1 at 1 C rate within potential range of 3.0–4.3 V. After 100 cycles at 0.2 C, the retention of discharge capacity was 96%. The modified electrochemical performance is mainly resulted from the distinct tremella-like structure.


2010 ◽  
Vol 03 (03) ◽  
pp. 185-188 ◽  
Author(s):  
XIAOYUN ZHAN ◽  
ZHAOHUI LI ◽  
JIAOJUN TANG ◽  
QIZHEN XIAO ◽  
GANGTIE LEI ◽  
...  

Highly crystallized and microsized particles of LiNi0.5Mn1.5O4 spinels with different morphologies have been successfully synthesized using polystyrene (PS) as the sacrificial template, and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical measurement. The spinels obtained at 700°C possess abundant porosity with about 200 nm in diameter, while the spinels calcined at 900°C exhibit a well-defined polyhedral morphology with particle size ranged from 0.2 to 2 μm. The materials prepared at 900°C display an excellent cycling performance due probably to better crystallinity and small particle size.


2013 ◽  
Vol 457-458 ◽  
pp. 191-196
Author(s):  
Guang Hui Guo ◽  
Shan Chen ◽  
Fang Fang Liu ◽  
Li Yu Zhang

In this paper, LiFe0.95Mn0.05PO4/C was prepared by using simulated FeCl3 etching waste as iron source for lithium-ion battery cathode materials. The structural and morphological properties of the samples were characterized by X-ray powder diffraction (XRD) and Scanning electron microscopy (SEM). The electrochemical performances of the sample were also investigated with charge and discharge test. The achieved results indicate that product obtained was confirmed to be LiFe0.95Mn0.05PO4 and has the advantage of high purity, small size and good electrochemical performance.


2013 ◽  
Vol 747-748 ◽  
pp. 613-618
Author(s):  
Qiao Zhang ◽  
Shu Hua Liang ◽  
Chen Zhang ◽  
Jun Tao Zou

The as-cast Ni-W alloys with 15wt%W, 25wt%W and 30wt%W were annealed in hydrogen at 1100. The effect of the annealing time on the microstructure of Ni-W alloys was studied, and the phase constituents and microstructure of annealed Ni-W alloys were characterized by the X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that no any phase changed for Ni-15%W, Ni-25%W and Ni-30%W alloys annealed for 60 min, 90 min and 150 min, which were still consisted of single-phase Ni (W) solid solution. However, microstructure had a significant change after annealing. With increase of annealing time, the microstructure of Ni-15%W alloy became more uniform after annealing for 90 min, and the average grain size was 95μm, whereas the grain size of Ni-15%W alloy increased significantly after annealing for 150 min. For Ni-25%W and Ni-30%W, there was no obvious change on the grain size with increase of annealing time, and the amount of oxides at grain boundaries gradually reduced. After annealing for 150 min, the impurities at grain boundaries almost disappeared. Subsequently, the annealing at 1100 for 150 min was beneficial for the desired microstructure of Ni-25%W and Ni-30%W alloys.


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