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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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土壤、沉积物系列标准物质中3.种元素的ICP-MS定值

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分析测试学报 2002年第5期21卷 9-12页

作者：王荔杨雁泽林守麟胡圣虹中国地质大学材料与化学工程学院湖北武汉430074 中国地质大学地球科学学院湖北武汉430074

探讨了电感耦合等离子体质谱测定土壤元素的基体效应及元素间的基体干扰 ,采用模拟土壤元素天然组成比值的校正溶液 ,利用 115In-103.h双内标校正系统有效地抑制了分析信号的动态漂移 ,建立了测定土壤中元素的ICP_MS方法 ;对GBW07410～0... 详细信息

探讨了电感耦合等离子体质谱测定土壤元素的基体效应及元素间的基体干扰 ,采用模拟土壤元素天然组成比值的校正溶液 ,利用 115In-103.h双内标校正系统有效地抑制了分析信号的动态漂移 ,建立了测定土壤中元素的ICP_MS方法 ;对GBW07410～07416土壤、沉积物系列标准物质进行定值 ,测定结果与XRF分析结果比较 ,同时用于GBW07404、GBW07405、GBW07408、GBW073.9管理样分析。

关键词：标准物质元素 ICP-MS 定值等离子体质谱标准物质土壤沉积物校正分析

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Preparation, characterization and salt-resistance of a coal based super absorbent composite

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Mining science and Technology 2010年第6期20卷 864-871页

作者： CHU Mo, HUANG Zhanbin, XU Bang, FANG Tao, DUAN Hui School of chemical and Environmental engineering, china {3. of Mining & Technology, Beijing 100083. china School of chemical and Environmental engineering China University of Mining & Technology Beijing 100083 China

Potassium humate was extracted from brown coal. A novel super absorbent composite, poly （acrylic acid-co-acryla- mide）/potassium humate （PAA-AM/KHA）, was prepared by graft polymerization of acrylic acid, acrylamide and coal based potassium humate using N, N＇-methylenebisacrylamide as a crosslinker and potassium peroxydisulfate as an initiator. The effects of reaction temperature, degree of neutralization of the poly （acrylic acid） and the amounts of crosslinker, initiator and potassium humate were investigated. Salt resistance tests were also carded out. The composite prepared under optimal conditions had a potassium bumate content of 10% and exhibited a water absorption of 770 g/g in distilled water, and 3.9, 286 and 41 gig in 0.5 mol/L KC1, MgC12 and A1CI3.solutions respectively. The results indicate that the salt resistance of PAA-AM/KHA was superior to that of poly （acrylic acid-co-acrylamide） because of the collaborative effect of functional groups of the coal based potassium humate. The PAA-AM/KHA micro powder was characterized by IR spectroscopy and the micrographic surface was characterized by scanning electron microscopy. Introduction of potassium humate into the poly （acrylic acid-co-acrylamide） structure creates a composite more suitable for use as a water-managing material in the renewal of arid and desert environments. The salt resisting property of the composite is improved, production costs are reduced and the growth stimulant effect is still present.

关键词： brown coal coal based potassium humate superabsorbent salt-resistant property

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Formation and Characterization of Bone-like Nanoscale Hydroxyapatite in Glass Bone Cement

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Journal of materials science & Technology 2004年第6期20卷 772-774页

作者： Qiang FU, Nai ZHOU, Wenhai HUANG, Deping WANG and Liying ZHANGSchool of materials science and engineering, Tongji {3., Shanghai 200092, china Sch. of Mat. Sci. and Eng. Tongji Univ. Shanghai 200092 China

Glass based bone cement (GBC) was synthesized by mixing CaO-SiO2-P2O5 based glass powder with ammonium phosphate liquid medium. Bone-like hydroxyapatite (HAP, Ca10(PO4)6(OH)2) was found to form after GBC was immersed in simulated body fluid (SBF). HAP crystal grew with an increasing time along c axle and reached about 200 nm in length after 3. days, however, the end plane granularity remained 3.-50 nm. The chemical composition, crystal structure and morphology of HAP formed from GBC were proved to have great resemblance with living HAP. It is believed that GBC was a desirabie biomedicai material with high bioactivity. Furthermore, the high compressive strength guaranteed the possibility of GBC in clinical application.

关键词： Bioactivity Bone cement Hydroxyapatite Microstructure

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Quantum chemical calculations of nitrogen cages N_(12)

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Chinese science Bulletin 1997年第6期42卷 462-465页

作者： QU Hong, LI Qianshu and ZHU HesunSchool of chemical engineering and materials {3. of Beijing Institute of Technology, Beijing 100081, china Stale Key Laboratory of Theoretical and Computational Chemistry, Jilin university, Changchun 13.023. china School of chemical engineering and materials {3. of Beijing Institute of Technology Beijing China State Key Laboratory of Theoretical and Computational Chemistry Jilin University Changchun China

WHILE carbon fullerenes are studied theoretically, we tend to predict if there may be some pure nitrogen molecules which possibly consist of the same geometric structures as carbon fullerenes. Experimentally Vogler et al. have obtained the intermediate absorbed at 3.0 nm which was assigned to N6 molecules in 1980. Some reports of ab initio calculations have appeared concerning theoretical aspects of nitrogen cage-like structures. Bliznyuk et *** the geometrical structure of N20 molecules with Ih symmetry at HF level, showing that N20 has a metastable dodecahedral geometry, with 209.3. kJ of nitrogen atoms more than that of 10N2. The N20 molecule might be a very effective high energy density

关键词： nitrogen cage ab initio calculation HEDM.

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Characterization of Calcined Kaolin/TiO_2 Composite Particle material Prepared by Mechano-chemical Method

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Journal of wuhan university of Technology(materials {3.) 2010年第5期25卷 765-769页

作者：王柏昆丁浩 School of materials science and Technology China University of Geosciences (Beijing)

Calcined kaolin/TiO2 composite particle material （CK/TCPM） was prepared with TiO2 coating on the surfaces of calcined kaolin particles by the mechano-chemical method. X-ray diffraction （XRD） and scanning electron microscope （SEM） were used to investigate the microstructures and morphologies, respectively. The mechanism of the mechano-chemical reaction between calcined kaolin and TiO2 was studied by infrared spectra （IR）. The results show that TiO2 coats evenly on the surfaces of calcined kaolin particles by Si-O-Ti and Al-O-Ti bonds on their interfaces. The hiding power and whiteness of CK/TCPM are 17.12 g/m^2 and 95.7%, respectively, presenting its similarity to TiO2 in pigment properties.

关键词： mechano-chemical method calcined kaolin TiO2 composite particles material pigment properties

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Characterzation and separation of Al_(13. species using gel-filtration chromatography

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science china Chemistry 2006年第4期49卷 326-331页

作者： CHU Yongbao1,2, GAO Baoyu1, YUE Qinyan1, WANG Yan1 & WANG Shuguang1 1. School of Environmental science and engineering, Shandong university, Jinan 250100,{3. 2. College of material and Environment, Qingdao university of science and Technology, Qingdao 266042,{3. School of Environmental science and engineering Shandong University Jinan China College of material and Environment Qingdao University of Science and Technology Qingdao China

A polyaluminum chloride (PAC) sample was prepared using a slow alkalinetitration method. The Bio-Gel P-100 gel column chromatographic technique was used to separate andcharacterize the various forms of aluminum present in the prepared PAC solution. The effluents froma gel column were monitored using online chemical method: AI-Ferron timed complexationspectropho-tometry and by ^(27)Al nuclear magnetic resonance (NMR) spectroscopy. Effects ofdifferent experimental conditions such as eluent flow rate, ionic strength and pH on separation ofAl_(13. were investigated. Experimental results indicated that molecule size exclusion was not theonly parameter affecting the column chromatographic separation efficiency of Al_(13. but moleculecharge as well. Reducing the eluent flow rate, increasing the ionic strength and suitable pHresulted in increase in the separation efficiency. Experimental results clearly indicated that byvarying the experimental conditions, it is possible to produce pure Al_(13. species using a gelcolumn chromatographic technique.

关键词： Al13 species, column chromatography, polyaluminum chloride (PAC), separation and purification.

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Electrochemical properties of Bismuth Doped α-MnO2 Nanorods for Supercapacitor Studies

Electrochemical properties of Bismuth Doped α-MnO2 Nanorods...

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中国颗粒学会超微颗粒专委会2011年年会暨第七届海峡两岸超微颗粒学术研讨会

作者： Yinping Xu~a,Chao Yang~(a,b,*),Lili Gao~a,Xike Tian~(a,b,*) Suxin Zhang~c,Yanxin Wang~b a faculty of material science and Chemistry {3.,china university of geosciences, wuhan 430074,P R china b School of Environmental Studies,china university of geosciences,wuhan {13.,P R china c State key laboratory of geological processes and mineral resources,china university of geosciences,wuhan,{13.,P.R.china

Bismuth doped α-MnO nanorods are synthesized by a simple hydrothermal method based on the redox *** samples are characterized by X-ray diffraction(XRD),Field emission scanning electron microscopy(FE-SEM) and transmission electron microscopy(TEM).Electrochemical properties of the products are evaluated by cyclic voltammetry and galvanostatic charge-discharge *** ours work,the pure MnO nanorods exhibits a relatively low specific capacitance of 87 Fg,whereas the 1%(atomic ratio) Bi-doped MnO exhibits excellent pseudocapacitive behavior with a specific capacitance of 171 Fg and shows a better cycle *** addition,highly stable and reversible performance after 2000 charge-discharge cycles is also demonstrated.

关键词： Manganese dioxide Bismuth Doped Supercapacitor Electrochemical properties hydrothermal

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Thermal stabilization of ordered mesoporous alumina with modification of rare earth

Thermal stabilization of ordered mesoporous alumina with mod...

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中国颗粒学会超微颗粒专委会2011年年会暨第七届海峡两岸超微颗粒学术研讨会

作者： Lili Gao~a,Chao Yang~(a,b*),Yinping Xu~a,Xike Tian~(a,b*) Suxin Zhang~c,Yanxin Wang~b a faculty of material science and Chemistry {3.,china university of geosciences, wuhan 430074,PR china b School of Environmental Studies,china university of geosciences,wuhan {13.,P R china c State key laboratory of geological processes and mineral resources,china university of geosciences,wuhan,{13.,P.R.china

The synthesis of organized mesoporous alumina has exploring new territory for application of this type of materials,particularly as catalysts or catalyst *** specific surface area and thermal stability are the major requirements for alumina as catalyst *** this paper,we report a facile synthesis of ordered and high thermal stability mesoporous alumina doping with La or Ce ions under hydrochloric acid *** stability improvements by rare earth(La and Ce) doping are *** our work,we find that both rare earth doping can effectively stabilize the amorphous walls of alumina *** material presents the ability to maintain the surface area and pore structure upon prolonged heating below 700℃. Further more,as the results shows the modification of La for improving the thermal stability is more effective than ***,Cl does not strongly influence the self-assembly process in the closed system.

关键词： Mesoporous materials Surfaces area rare earth

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Novel Nanosized Adsorbing Composite Cathode materials for the Next Generational Lithium Battery

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Journal of wuhan university of Technology(materials {3.) 2007年第2期22卷 234-239页

作者：张勇 School of material and chemical engineering Zhengzhou University of Light Industry

A novel carbon-sulfur nano-composite material was synthesized by heating sublimed sulfur and high surface area activated carbon （HSAAC） under certain conditions. The physical and chemical per- formances of the novel carbon-sulfur nano-composite were characterized by scanning electron microscopy （SEM）, Brunauer-Emmett-Teller （BET） and X-ray diffraction （XRD）. The electrochemical performances of nano-composite were characterized by charge-discharge characteristic, cyclic voltammetry and electrochemical impendence spectroscopy （EIS）. The experimental results indicate that the electrochemical capability of nano- composite material was superior to that of traditional S-containing composite material. The cathode made by carbon-sulfur nano-composite material shows a good cycle ability and a high specific charge-discharge capacity. The HSAAC shows a vital role in adsorbing sublimed sulfur and the polysulfides within the cathode and is an excellent electric conductor for a sulfur cathode and prevents the shuttle behavior of the lithium-sulfur battery.

关键词： high surface area activated carbon sublimed sulfur lithium battery composite material: adsorbing composite

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