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Electrochemical performance of LiFePO_4 cathode material for Li-ion battery

Rare Metals 2006年第z1期25卷 62-66页

作者： LI Shuzhong LI Chao FAN Yanliang XU Jiaqiang WANG Tao YANG Shuting Engineering Research Centre for New Power Source Materials of henan province Xinxiang 453002 China Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China Department of Chemical Engineering College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 China

In the search for improved materials for rechargeable lithium batteries, LiFePO4 offers interesting possibilities because of its low raw materials cost, environmental friendliness and safety. The main drawback with using the material is its poor electronic conductivity and this limitation has to be overcome. Here Al-doped LiFePO4/C composite cathode materials were prepared by a polymer-network synthesis technique. Testing of X-ray diffraction, charge-discharge, and cyclic voltammetry were carried out for its performance. Results show that Al-doped LiFePO4/C composite cathode materials have a high initial capacity, good cycle stability and excellent low temperature performance. The electrical conductivity of LiFePO4 material can be obviously improved by doping Al. The better electrochemical performances of Al-doped LiFePO4/C composite cathode materials have a connection with its conductivity.

关键词： lithium ion batteries LiFePO4 doping electrochemical performance

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EFFECTS OF EL NINO, LA NINA AND SOLAR ACTIVITIES ON THE OUTBREAKS OF THE ORIENTAL MIGRATORY LOCUST IN henan province

EFFECTS OF EL NINO, LA NINA AND SOLAR ACTIVITIES ON THE OUTB...

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The ⅩⅤth International Plant Protection Congress

作者： KONG Hai-jiang1 LU Wei-song1 WANG Xiao-dan2 LU Guo-qiang3 and WANG Rui2 1Department of Atmospheric Science Nanjing institute of Meteorology Nanjing 210044 china 2meteorological Observatory of henan province zhengzhou 450003 china 3Plant Protection and Quarantine Station of henan province zhengzhou 450002 china

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Dry Matter Yields of Alfalfa Varieties with Different Fall Dormancy

Dry Matter Yields of Alfalfa Varieties with Different Fall D...

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河南省畜牧兽医学会第七届理事会第二次会议暨2008年学术研讨会

作者： Wang Cheng-zhang~1 Han Jin-feng~2 Guo Yu-xia~1 Gao Yong-ge~3 Wang Yan-hua~(1,3) Shi Ying-hua~1 (1.Engineering College of Animal Husbandry and Veterinary Science,henan Agricultural University,zhengzhou 450002,henan province,china 2.Agronomy College of henan Agricultural University,zhengzhou 450002,henan province,china 3.Forage Grass and Feedstuff Station of Animal Husbandry bureau of henan province,zhengzhou,henan 450002,china)

Fall dormancy (FD) is one of the most important traits in alfalfa (Medicago sativa L.) crop grown in northern climates. Dry matter production data of varieties with different FD levels are needed for predicting the yield *** research was undertaken to identify and compare variability in dry matter (DM) yields of 42 alfalfa varieties with FD classes ranging from 2 to 9 in zhengzhou,henan province,*** study was conducted for four years with five cuts per *** results showed that the dormant (class 2) and the semidormant varieties (class 4) produced the greatest DM yield,which were significantly greater than nondormant varieties of FD classes ***,DM yields among dormant and semidormant varieties of FD classes 2 to 6 were not different,so did among classes 3,5,6,7,8,*** negative correlation was between FD classes and DM yields,but their correlation was not significant,which correlation coefficient was -0.097,suggesting that the FD should not be used as main index in zhengzhou introducing variety *** in DM yields among the varieties with identical FD class indicate the possibility in selecting varieties with both great yields and suitable FD *** this study,the best varieties were"Runner"(class 2),"Alfaking"(class 3),"WL-323ML"(class 4),"Goldenkey",and"CW680"(class 6),with average annual DM yields ranged from 22 to 24 t ha-1.(3)For all varieties,DM yield for the first cut was the highest,reduced gradually for the subsequent cuts,and was the lowest for the final cut each year,indicating larger influence of growing seasons than of the FD *** data suggest that in order to increase DM yield,best management practices should be focused on the spring and early summer.

关键词： alfalfa dry matter fall dormancy class yield

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仙居县城乡居民消费差异的生态足迹分析

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城市环境与城市生态 2003年第4期16卷 86-88页

作者：闵庆文余卫东成升魁王秀珍中国科学院地理科学与资源研究所北京100101 河南省商丘市气象局商丘476000 浙江省气象局科研所杭州310002

根据生态足迹理论,以浙江省仙居县为例,利用统计调查和问卷调查资料,分别计算了城乡居民生活消费的生态系统占用情况。计算结果表明,该地城市居民的生活消费所占用的生态系统是农村居民所占用的1.73倍,差异最大的是草地,其次是水域、建... 详细信息

根据生态足迹理论,以浙江省仙居县为例,利用统计调查和问卷调查资料,分别计算了城乡居民生活消费的生态系统占用情况。计算结果表明,该地城市居民的生活消费所占用的生态系统是农村居民所占用的1.73倍,差异最大的是草地,其次是水域、建筑用地、化石能源和耕地,对于林地的占用则是农村居民大于城市居民。

关键词：仙居县居民消费差异生态足迹农村城市城市化生态经济

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The Development and Design of Weather Channel Remote News Gathering System

The Development and Design of Weather Channel Remote News Ga...

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第24届中国控制与决策会议

作者： Xuerui Wang henan institute of Engineering, zhengzhou 451191,china

This paper briefly introduces Weather china about its weather news all over the country and the business requirements of remote actual weather live collection , according to the construction of remote weather news collection system detailed. Introduce the layout scheme, general design thought, and composition of the systerm and the development and design of application software in detail.

关键词： meteorological Channel Weather News Remote Gathering

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汉武帝初置刺史部十三州辨析

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史学月刊 2000年第3期 24-29页

作者：汪清郑州大学历史研究所河南郑州450052

汉武帝元封五年设立的刺史制度，传统中的观点大多认为按“州”或“州部”派遣刺史，以致出现了许多无法解释的疑难问题。其实，“州”、“部”是两个不同的概念，武帝是将全国除京畿以外的所有郡国划分为十三个监察区域，叫做“部”，... 详细信息

汉武帝元封五年设立的刺史制度，传统中的观点大多认为按“州”或“州部”派遣刺史，以致出现了许多无法解释的疑难问题。其实，“州”、“部”是两个不同的概念，武帝是将全国除京畿以外的所有郡国划分为十三个监察区域，叫做“部”，武帝应是设立十三刺史部，其中包括有朔方刺史部，但不存在所谓“朔方州”。

关键词：州部刺史汉武帝

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Study on the Moisture Permeability of Polyurethane Coated Fabrics

Study on the Moisture Permeability of Polyurethane Coated Fa...

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2010 Second International Asia Symposium on Intelligent Interaction and Affective Computing and 2010 Second International Conference on Innovation Management (ASIA-ICIM 2010)

作者： Kaifang Xie School of Textiles Tianjin Polytechnic University Tianjin 300160 china College of Textile Zhongyuan University of Technology zhengzhou henan province 450007 PR china Shouhui Chen College of Textile Zhongyuan University of Technology zhengzhou henan province 450007 PR china henan Key Laboratory of Functional Textiles Material zhengzhou henan province 450007 PR china

One side coated fabric is chose to be tested its water vapor permeability by means of desiccant method and analyzed the relation between its water vapor transmission rates （WVT） and the coating film thickness and temperature and *** results show that the WVT of coated fabric decreases with the increase of coating film thickness,and increases with that of temperature or *** provides reliable theoretical basis for other people to design and exploit waterproof and breathable fabrics which are light and comfortable or intelligent.

关键词： PU coated fabric Water vapor transmission Moisture permeability

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Computation of SVC based on Instantaneous Reactive Power Theory

Computation of SVC based on Instantaneous Reactive Power The...

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2010 The 3rd International Conference on Power Electronics and Intelligent Transportation System (PEITS 2010)

作者： Meng Qingbo Department of Electrical Engineering,zhengzhou Railway Vocational and Technical College zhengzhou,henan province,china Zhang Zhijun Department of Electrical Engineering,zhengzhou Railway Vocational and Technical College zhengzhou,henan province,china

The paper presents the concept of Flexible AC Transmission System and Static Var *** the example of SVC for TCR+FC type,the author expounds the elements and basic principles of the SVC,proposes the controller's *** on instantaneous reactive power theory,the paper ascertains the algorithm of compensation admittance and trigger ***,changing the trigger angle of thyristor can change the electrical admittance of SVC,change the fundamental current of system and implement the reactive power compensation *** conclusion,the paper analyses the control performance of the algorithm on accuracy and real-time.

关键词： SVC TCR+FC reactive power compensation instantaneous reactive power theory,algorithm

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Preparation and Cytotoxic activity of Hydroxycamptothecin Nanosuspensions

Preparation and Cytotoxic activity of Hydroxycamptothecin Na...

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全国第十一届生化与分子药理学学术会议

作者： Wei-Jing Liu~1,Yong-Xing Zhao~1,Hai-Ying Hua~2 1.College of Pharmaceutical Science,zhengzhou University,zhengzhou,henan province 450001,PR china 2.Academy of Medical and Pharmaceutical sciences of zhengzhou University,zhengzhou,henan province 450052,PR china

This manuscript describes the preparation,characterization,and cytotoxic activity of hydroxycamptothecin *** precipitation-combined high-pressure homogenization(PCH) technique was evaluated for formulation *** on the ...

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SYNTHESIS AND CHARACTERIZATION OF ORGANOMONTMORILLONITE AND POLYAMIDE 66/MONTMORILLONITE NANOCOMPOSITES

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Chinese Journal of Polymer Science 2002年第6期20卷 551-557页

作者： Cheng-shen Zhu Xin Kang Su-qin He Liu-yang Wang Li-yun Lu College of Materials Engineering,zhengzhou University, zhengzhou 450052, china College of Materials Engineering Zhengzhou University Zhengzhou 450052

The montmorillonites (MMTs), layered, smectite-type silicates, were premodified by two different methods prior to the polymer melt intercalation. In one case MMTs were modified with cetyltrimethylammonium bromide (CTAB), and termed as organomontmorillonites (OMMTs); in the other case MMTs were modified by nylon, and the products were called modified montmorillonites (MMMTs). The effects of CTAB and nylon on the MMTs were investigated by using TG and WAXD. The results show that interlayer spacings of CTAB and nylon modified MMTs are larger than that of sodium MMTs. Then, polyamide 66 (PA 66)/MMT nanocomposites were obtained through the method of melt intercalation of polymers. The nanocomposites were characterized by WAXD, TEM and Molau experiments. The results indicate that the MMTs disperse homogeneously in the PA 66 matrix. The mechanical properties of nanocomposites, such as tensile properties and flexural properties, were also measured and show a tendency to increase with increase of MMT content and reach the maximum values at 5phr MMT content. The heat distortion temperature (HDT) of the nanocomposites (7 phr) is about 32 K higher than that of pure PA 66.

关键词： montmorillonite polyamide 66 nanocomposites melt intercalation

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