摘要 :
The graphite was modified using pitch through dynamical melt-carbonization, and the effects of modification temperature and the amount of pitch on the characteristics of graphite were investigated. The structure and characteristic...
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The graphite was modified using pitch through dynamical melt-carbonization, and the effects of modification temperature and the amount of pitch on the characteristics of graphite were investigated. The structure and characteristics of the graphite were determined by X-ray diffractometry(XRD), scanning electron microscopy(SEM), particle size analysis and electrochemical measurements. The results show that the modified graphite has a disordered carbon/graphite composite structure, larger average particle diameter, greater tap density, and better electrochemical characteristics than the untreated graphite. The sample coated with 10% pitch dynamical melt-carbonized at 400℃ for 3 h and heat-treated at 850℃ for 2 h has better electrochemical performances with a reversible capacity of 360.5 mA·h/g, a irreversible capacity of 41.0 mAh/g, and an initial coulombic efficiency of 89.8% compared with natural graphite and disordered carbon. The cycling stability of the Li/C cell with modified graphite as anodes is improved, and its capacity retention ratio at the 30th cycle is up to 94.37%.
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摘要 :
The effects of some substituting elements on the specific discharge capacity, activation and cycling life of AB5 non-stoichiometric hydrogen absorbing alloys were studied electrochemically. Results show that the characteris- Tics ...
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The effects of some substituting elements on the specific discharge capacity, activation and cycling life of AB5 non-stoichiometric hydrogen absorbing alloys were studied electrochemically. Results show that the characteris- Tics of hydrogen absorbing alloys under low current density are greatly improved through the substitution of Ni by Sn, Co, and Mn.
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摘要 :
DUS testing technique used for plant variety protection was reviewed in the paper, and some suggestions were made on how to establish the appropriate technology system in China. Meanwhile, the potential exploitation of the techniq...
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DUS testing technique used for plant variety protection was reviewed in the paper, and some suggestions were made on how to establish the appropriate technology system in China. Meanwhile, the potential exploitation of the technique was discussed.
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摘要 :
Five non-stoichiometric alloys, i. e., LaNi5.15, La(NiSn)5.14, La(NiSnCo)5.12, and La(NiSnCoMnAl)5.10 were studied. It is shown that the second minor phase does not exist in the major phase Through the X-ray diffraction analysis. ...
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Five non-stoichiometric alloys, i. e., LaNi5.15, La(NiSn)5.14, La(NiSnCo)5.12, and La(NiSnCoMnAl)5.10 were studied. It is shown that the second minor phase does not exist in the major phase Through the X-ray diffraction analysis. By is shown that the second minor phase does not exist in the major phase Tice decreases with the increasing of the amount of atom B in AB5.
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摘要 :
The arsenic and antimony dust arisen from the volatilization of anode slime in the electrolysis of copper and lead was used as raw materials. The process of direct volatilization or reduction-oxidation volatilization was employed ...
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The arsenic and antimony dust arisen from the volatilization of anode slime in the electrolysis of copper and lead was used as raw materials. The process of direct volatilization or reduction-oxidation volatilization was employed to produce the mixture of As_2O_3 and Sb_2O_3, and then Na_2SO_4 was added to produce clarificant for glass. The optimizing technology conditions which were obtained from the test of preparing the mixture of pure As_2O_3 and Sb_2O_3 by the volatilization method are reaction temperature 900deg.C and reaction time about 30 min. The glass clarificant produced meets industrial application standard.
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摘要 :
The arsenic and antimony dust arisen from the volatilization of anode slime in the electrolysis of copper and lead was used as raw materials. The process of direct volatilization or reduction-oxidation volatilization was employed ...
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The arsenic and antimony dust arisen from the volatilization of anode slime in the electrolysis of copper and lead was used as raw materials. The process of direct volatilization or reduction-oxidation volatilization was employed to produce the mixture of As_2O_3 and Sb_2O_3, and then Na_2SO_4 was added to produce clarificant for glass. The optimizing technology conditions which were obtained from the test of preparing the mixture of pure As_2O_3 and Sb_2O_3 by the volatilization method are reaction temperature 900deg C and reaction time about 30 min. The glass clarificant produced meets industrial application standard.
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