National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology

Kunming, China

National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology

Kunming, China

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Du J.,Kunming University of Science and Technology | Du J.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | Zhang Z.,Kunming University of Science and Technology | Zhang Z.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | And 17 more authors.
Journal of Solid State Electrochemistry | Year: 2014

In this paper, La0.4Ca0.6CoO3-coated LiNi1/3Mn1/3Co1/3O2 is successfully prepared by the sol-gel method associated with microwave pyrolysis method. The structure and electrochemical properties of the La0.4Ca 0.6CoO3-coated LiNi1/3Co1/3Mn 1/3O2 are investigated by using X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and charge/discharge tests. XRD analyses show that the La0.4Ca0.6CoO3 coating does not change the structure of LiNi1/3Co1/3Mn 1/3O2. The electrochemical performance studies demonstrate that 2 wt.% La0.4Ca0.6CoO3-coated LiNi 1/3Co1/3Mn1/3O2 powders exhibit the best electrochemical properties, with an initial discharge capacity of 156.9 mAh g-1 and capacity retention of 98.9 % after 50 cycles when cycled at a current density of 0.2 C between 2.75 and 4.3 V. La0.4Ca 0.6CoO3 coating can improve the rate performance because of the enhancement of the surface electronic/ionic transportation by the coating layer. EIS results suggest that the coating La0.4Ca 0.6CoO3 plays an important role in suppressing the increase of cell impedance with cycling especially for the increase of charge-transfer resistance. © 2014 Springer-Verlag Berlin Heidelberg.


Wei Y.-Q.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | Wei Y.-Q.,Kunming University of Science and Technology | Peng J.-H.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | Peng J.-H.,Kunming University of Science and Technology | And 9 more authors.
Journal of Central South University | Year: 2014

Traditional treatments of zinc dross have many disadvantages, such as complicated recovering process and serious environmental pollution. In this work, a new process of chlorine removal from zinc dross by microwave was proposed for solving problem of recycling the zinc dross. With better ability of absorbing the microwave than zinc oxide, the main material in zinc dross, chlorides, can be heated and evaporated rapidly during microwave roasting. Various parameters including roasting temperature, duration time and stirring speed were optimized. The microstructure of roasted materials was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The content of the chloride was analyzed by the method of chlorine ion selective electrode. The experiments indicate that the best duration time is 60 min with a stirring speed of 15 r/min during the microwave roasting process. The dechlorination rate reaches peak value of 88% at 700 °C. The chlorine is removed as HCl gas when water vapor is used as activating agent, which means that it can be recovered into hydrochloride acid. © 2014 Central South University Press and Springer-Verlag Berlin Heidelberg.


Han Y.,Kunming University of Science and Technology | Han Y.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | Zhang Z.,Kunming University of Science and Technology | Zhang Z.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | And 6 more authors.
TMS Annual Meeting | Year: 2013

In this paper, results of a novel synthesis method of carbon-coated LiNi1/3Mn1/3Co1/3O2 cathode material for lithium-ion battery are reported. The carbon coating was produced from a precursor, glucose, by microwave-pyrolysis method. The structure, morphology and electrochemical performance of the bare and carbon-coated LiNi 1/3Mn1/3Co1/3O2 were characterized by X-ray diffraction, scanning electron microscopy and charge-discharge tests respectively. The L8(27) orthogonal experiments were carried out to optimize LiNi1/3Co1/3Mn1/3O2/C technological conditions. The conditions of the orthogonal experiments were that the glucose content were 1.5% and 4%, the holding time were 15min and 30min, the heating temperature were 400°C and 500°C and the solvent were H 2O and CH3CH2OH. The main experiment target include specific capacity at 0.1C and 0.2Cinverted commas Capacity retention rateinverted commas medium voltage attenuation rate and The fifth discharge medium voltage. The data were analyzed by Minitab 14 statistics software. The results of analysis of variance indicated that the most influential factor was the glucose content despite of discharge rate. Secondly, the effect of the solvent was equivalent to the holding time.


Lu S.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | Lu S.,Kunming University of Science and Technology | Yaqian W.,National Loc Jt Engineering Laboratory Of Engineering Applications Of Microwave Energy And Equipment Technology | Yaqian W.,Kunming University of Science and Technology | And 8 more authors.
TMS Annual Meeting | Year: 2013

The contrastive studies of microwave and conventional roasting copper residue from zinc hydrometallurgical was carried. The experimental results showed that the microwave roasting has the higher dechlorination rate in the same condition such as temperature, heat preservation time and atmosphere. When the samples with 100 mesh grain size, the Cl content turned from 14.27% to 1.33% and the dechlorination rate achieved over 90% at 400°C with 2h microwave roasting. And in the same conditions, the materials' dechlorination rate after conventional roasting just reached around 78%. The phase changes of the roasting process was investigated with X-ray diffraction analysis.

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