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High power nano-LiMn_2O_4 cathode materials with high-rate pulse discharge capability for lithium-ion batteries

Chinese Physics B 2011年第2期20卷 532-537页

作者：陈颖超谢凯盘毅郑春满王华林 Department of Material Engineering and Applied Chemistry College of Aerospace and Materials EngineeringNational University of Defense Technology

Nano-LiMn2O4 cathode materials with nano-sized particles are synthesized via a citric acid assisted sol-gel route. The structure, the morphology and the electrochemical properties of the nano-LiMn204 are investigated. Compared with the micro-sized LiMn2O4, the nano-LiMn2O4 possesses a high initial capacity （120 mAh/g） at a discharge rate of 0.2 C （29.6 mA/g）. The nano-LiMn2O4 also has a good high-rate discharge capability, retaining 91% of its capacity at a discharge rate of 10 C and 73~ at a discharge rate of 40 C. In particular, the nano-LiMn2O4 shows an excellent high-rate pulse discharge capability. The cut-off voltage at the end of 50-ms pulse discharge with a discharge rate of 80 C is above 3.40 V, and the voltage returns to over 4.10 V after the pulse discharge. These results show that the prepared nano-LiMn2O4 could be a potential cathode material for the power sources with the capability to deliver very high-rate pulse currents.

关键词： lithium-ion batteries lithium manganese oxide high-rate pulse discharge

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Effect of activated NH_3 on SO_2 removal by pulse corona discharge plasma in flue gas

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Journal of Environmental Sciences 2000年第4期12卷 448-451页

作者： LI Jie, WU Yan, WANG Ning\|hui, YANG Li\|ming (Institute of Electrostatics, Dalian University of Technology, Dalian 116023, China) 大连理工大学辽宁大连 1 1 6 0 2

NH 3 activated electrode is placed in front of the electrode system of pulse corona discharge plasma. There are nozzles on the electrode. Positive DC high\|voltage is applied on the nozzle\|plate gap. NH\-3 is injected into the reactor through nozzles, at the same time, activated and treated. These nozzles were proposed in order to make the additional gas pass through corona discharge regions near the tip of nozzles and increase the mount of radicals. The aim is to improve the De\|SO\-2 efficiency by pulse discharge plasma in flue gas. The following topics are investigated and discussed in the paper: De\|SO\-2 effect of single NH\-3\|activated electrode, De\|SO\-2 effect of activated NH\-3, the relationship between stoichiometric ratio of NH\-3 to SO\-2 and De\|SO\-2 effect of activated NH\-3, mechanism of activated NH\-3 De\|SO\-2 effect. The experimental result indicates that the De\|SO\-2 efficiency can be increased 5%—10% by activated NH\-3 on the original base of De\|SO\-2 efficiency.

关键词： activated NH_3 De-SO_2 pulse discharge

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Oxide Coated Cathode Plasma Source of Linear Magnetized Plasma Device

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Plasma Science and Technology 2016年第9期18卷 918-923页

作者： HU Guanghai JIN Xiaoli YUAN Lin ZHANG Qiaofeng XIE Jinlin LI Hong LIU Wandong Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Plasma source is the most important part of the laboratory plasma platform for fundamental plasma experimental research. Barium oxide coated cathode plasma source is well recognized as an effective technique due to its high electron emission current. An indirectly heated oxide coated cathode plasma source has been constructed on a linear magnetized plasma device. The electron emission current density can reach 2 A/cm2 to 6 A/cm2 in pulsed mode within pulse length 5-20 ms. A 10 cm diameter, 2 m long plasma column with density 10is m-3 to 1019 m3 and electron temperature Te --~ 3-7 eV is produced. The spatial uniformity of the emission ability is less than 4% and the discharge reproducibility is better than 97%. With a wide range of the plasma parameters, this kind of plasma source provides great flexibility for many basic plasma investigations. The detail of construction and initial characterization of oxide coated cathode are described in this paper.

关键词： oxide coated cathode plasma source magnetized plasma pulse discharge

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