检索结果-南通市图书馆

Rare Metals 2020年第12期39卷 1364-1373页

作者： Yu-Qing Dai Guang-Chao li xin-hai li Hua-Jun Guo Zhi-xing Wang Guo-Chun Yan Jie-Xi Wang School of Metallurgy and Environment&College of Chemistry and Chemical Engineering Central South UniversityChangsha410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials School of Metallurgy and Environment&College of Chemistry and Chemical EngineeringChangsha410083China

Graphitic carbons with reasonable pore volume and appropriate graphitization degree can provide efficient li+/electrolyte-transfer channels and ameliorate the sluggish dynamic behavior of battery-type carbon negative electrode in lithium-ion capacitors(liCs).In this work,onion-like graphitic carbon materials are obtained by using carbon quantum dots as precursors after sintering,and the effects of alkali metal salts on the structure,morphology and performance of the samples are *** results show that alkali metal salts as activator can etch graphitic carbons,and the specific surface area and pore size distribution are intimately related to the description of the alkali metal ***,it also affects the graphitization degree of the *** porous graphitic carbons(SGCs)obtained by NaCl activation exhibit high specific surface area(77.14 m^(2)·g^(-1))and appropriate graphitization *** is expectable that the electrochemical performance for lithium-ions storage can be largely promoted by the smart combination of catalytic graphitization and pores-creating ***-performance liCs(S-GCs//AC liCs)are achieved with high energy density of 92 Wh·kg^(-1)and superior rate capability(66.3 Wh·kg^(-1)at10 A·g^(-1))together with the power density as high as10020.2 W·kg^(-1).

关键词： Alkali metal salts activation Porous graphitic carbons Catalytic graphitization lithium-ion capacitors

Review of silicon-based alloys for lithium-ion battery anodes

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1549-1564页

作者： Zhi-yuan Feng Wen-jie Peng Zhi-xing Wang Hua-jun Guo xin-hai li Guo-chun Yan Jie-xi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083China

Silicon(Si)is widely considered to be the most attractive candidate anode material for use in next-generation high-energy-density lithium(li)-ion batteries(liBs)because it has a high theoretical gravimetric li storage capacity,relatively low lithiation voltage,and abundant ***,massive efforts have been exerted to improve its electrochemical *** some progress in this field has been achieved,a number of severe challenges,such as the element’s large volume change during cycling,low intrinsic electronic conductivity,and poor rate capacity,have yet to be *** to solve these problems have been attempted via the development of nanosized Si ***,reviews summarizing the work on Si-based alloys are ***,the recent progress related to Si-based alloy anode materials is *** problems associated with Si anodes and the corresponding strategies used to address these problems are first ***,the available Si-based alloys are divided into Si/li-active and inactive systems,and the characteristics of these systems are *** special systems are also ***,perspectives and future outlooks are provided to enable the wider application of Si-alloy anodes to commercial liBs.

关键词： silicon alloy anode lithium-ion battery

Effect of SnO_2 intermediate layer on performance of Ti/SnO_2/MnO_2 electrode during electrolytic-manganese process

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1417-1422页

作者： xin CHEN Hua-jun GUO Shu-liang LUO Zhi-xing WANG xin-hai li School of Metallurgy and Environment Central South University Changsha 410083 China

SnO2intermediate layers were coated on the titanium(Ti)substrate by thermal *** electronmicroscope(SEM)and X-ray diffraction(XRD)results show that uniform SnO2intermediate layers with rutile crystal structure weresuccessfully *** to the results of linear sweep voltammetry(LSV),oxygen evolution potential(OEP)of theTi/SnO2/MnO2electrodes decreases with increasing SnO2content,indicating that the electro-catalytic oxidation activity of theelectrode *** service life tests results demonstrate that SnO2intermediate layer can improve the service life of theTi/SnO2/*** the content of SnO2intermediate layer increases,the cell voltage and the energy consumption decreaseapparently.

关键词： tin dioxide intermediate layer oxygen evolution potential accelerated service life cell voltage, electrolytic-manganese

Construction of a small peptide library related to inhibitor OM99-2 and its structure-activity relationship to β-secretase

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2006年第12期27卷 1586-1593页

作者： Bin HU Bing XIONG Bei-ying QIU xin li hai-ping YU Kun XIAO xin WANG Jia li Jing-kang SHEN~2 State Key Laboratory of Drug Research and National Center for Drug Screening,Shanghai Institute of Materia Medica,Shanghai Institutes for Biological Sciences,Chinese Academy of Sciences,Shanghai 201203,China State Key Laboratory of Drug Research and National Center for Drug Screening Shanghai Institute of Materia Medica Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai China

Aim:To develop probes for detecting the binding specificity between β-secretaseand substrate,and provide reliable biological activity data for further researchingencircling substrate-based ***:To prepare the inhibitors,thehydroxyethylene(HE)segment including P1and P1′ was synthesized after multi-step reactions;the combination of all segments was then completed through solidphase *** human β-secretase ectodomain(amino acid resi-dues 1-460)was expressed as a secreted protein with a C-terminal His tag in insectcells using baculovirus infection,and all compounds were evaluated in thisβ-secretase enzyme *** order to understand the interaction in detail,the theoretical methods,namely molecular dynamics(MD)simulation and mo-lecular mechanics-generalized-born surface area(MM-GBSA)analysis,were per-formed on the complex of β-secretase and OM99-2 to obtain the geometrical andenergetical ***:We designed and constructed a positional scan-ning combinatorial library including 16 compounds;all members of the librarywere synthesized based on HE dipeptide ***-activity relationshipstudies at the P4-P1and P1′-P4′ positions led to the discoveries of P and P’sidesbinding specificity and potent inhibitors 14,18,and *** binding free energyon the whole system and every residue were compared to the biological ***:The removal of P4′ yielded inhibitor 22(A3*B2)with highpotency;further truncation of P3′ gave inhibitor 18(A3*B1)with equal activity,implying that the right side of the inhibitors play a less important role and could beeasily simplified,while change on the P side may cause substantial results.

关键词： β-secretase hydroxyethylene OM99-2 Alzheimer’s disease structure-activity relationship

Property and Oxidation Behaviours of (Mo,Cr)Si2 + ZrO2 Composite Produced by Pressure-Less Sintering

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science and Chemical Engineering 2016年第7期4卷 15-21页

作者： Yiming Yao Erik Ström xin-hai li Qin Lu Department of Materials and Manufacturing Technology Chalmers University of Technology Gothenburg Sweden Heating Systems Division Sandvik Heating Technology AB Hallstahammar Sweden Material Technology Siemens Industrial Turbomachinery AB Finspong Sweden

A composites of (Mo0.9Cr0.1)Si2 + 15vol% ZrO2 was prepared with powder metallurgy and Pressure- Less Sintering (PLS) method, aiming at applications of high temperature structural materials. Mechanical properties of the composites were assessed with hardness, indentation fracture toughness Kc and KIC tested using SEVNB, flexure strength at room temperature and 1200?C, and isothermal oxidation at 1400?C. The results showed that the native silica oxide and molybdenum-oxides on the silicide feedstock surface were significantly reduced in terms of Cr-alloying. (Mo0.9Cr0.1)Si2 and its composite also exhibited improved sinterability and grain growth, owing to the presence of (Cr, Mo)5Si3 at grain boundaries. Fracture toughness of the composite was increased by a factor of 1.6 to that in the monolithic silicide. Mechanical property of the composite at high temperature was not affected by Cr addition. However, the high temperature oxidation resistance was greatly improved in the (Mo0.9Cr0.1)Si2 + 15vol% ZrO2 compared with the non Cr-alloyed counterpart. The Cr-alloying effects on the microstructure, fracture behaviour, and high temperature oxidation resistance were discussed.

关键词： MoSi2 Composite Fracture Toughness Mechanical Property Microstructure High Temperature Oxidation

Mechanism for capacity fading of 18650 cylindrical lithium ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2017年第7期27卷 1602-1607页

作者： Jian-liang CHENG xin-hai li Zhi-xing WANG Hua-jun GUO School of Metallurgy and Environment Central South University Changsha 410083 China

The mechanism for capacity fading of18650lithium ion full cells under room-temperature(RT)is *** capacity loss of18650cells is about12.91%*** cells after cycles are analyzed by XRD,SEM,EIS and *** measurement shows an overall increase in the cell resistance upon ***,it also presents anincreased charge-transfer resistance(Rct)for the cell cycled at *** test shows that the reversibility of lithium ioninsertion/extraction reaction is *** capacity fading for the cells cycled can be explained by taking into account the repeatedfilm formation over the surface of anode and the side *** products of side reactions deposited on separator are able toreduce the porosity of *** a result,the migration resistance of lithium ion between the cathode and anode would beincreased,leading the fading of capacity and potential.

关键词： 18650 lithium ion battery capacity fading cycle performance

Recovery of valuable metals from lepidolite by atmosphere leaching and kinetics on dissolution of lithium

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2019年第3期29卷 641-649页

作者： Jin-lian liU Zhou-lan YIN xin-hai li Qi-yang HU Wei liU School of Chemistry and Chemical Engineering Central South University Changsha 410083 China Jiangxi Yunwei New Material Company limited Yichun 336000 China School of Metallurgy and Environment Central South University Changsha 410083 China

The lepidolite located in Yichun, Jiangxi Province, China, was adopted to investigate the recovery of alkali metals and leaching kinetics of lithium with sulphuric acid solution under atmospheric pressure. The results show that the recoveries of alkali metals were achieved under the leaching conditions: mass ratio of lepidolite with particle size less than 180 μm to sulphuric acid 1.2, leaching temperature 411 K, liquid-solid ratio 2.5∶1, and leaching time 10 h. Under the selected conditions for leaching experiment, the leaching rates of lithium, potassium, rubidium and caesium are 94.18%, 93.70%, 91.81% and 89.22%, respectively. The X-ray diffraction analysis for leaching residue indicates that no insoluble product forms during leaching. The chemical compositions of leaching residue reveal that trace iron, manganese and calcium disappear after acid leaching. The kinetics of leaching process for lithium follows shrinking core model of mixed control and the apparent activation energy is 17.21 kJ/mol. The reaction orders with respect to sulphuric acid concentration and liquid-solid ratio are determined to be 2.85 and 1.66, respectively. A semi-empirical rate equation was obtained to describe the leaching process. The kinetic analysis shows that the leaching process is controlled by diffusion through the insoluble layer of the associated minerals.

关键词： kinetics lepidolite lithium activation energy leaching

Enhanced cycling stability of La modified liNi_(0.8-x)Co_(0.1)Mn_(0.1)La_xO_2 for li-ion battery

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1134-1142页

作者： Ming-xia DONG Xiang-qun li Zhi-xing WANG xin-hai li Hua-jun GUO Zhen-jun HUANG School of Metallurgy and Environment Central South University Changsha 410083 China

A series of layered liNi0.8?xCo0.1Mn0.1LaxO2(x=0,0.01,0.03)cathode materials were synthesized by combining co-precipitation and high temperature solid state reaction to investigate the effect of La-doping on liNi0.8Co0.1Mn0.1O2.A new phase La2li0.5Co0.5O4was observed by XRD,and the content of the new phase could be determined by Retiveld refinement and *** cycle stability of the material is obviously increased from74.3%to95.2%after La-doping,while the initial capacity exhibits a decline trend from202mA·h/g to192mA·h/*** enhanced cycle stability comes from both of the decrease of impurity and the protection of newly formed La2li0.5Co0.5O4,which prevents the electrolytic corrosion to the active *** CV measurement confirms that La-doped material exhibits better reversibility compared with the pristine material.

关键词： nickel-rich cathode material La-doping electrochemical property cycle stability li-ion diffusion coefficient

肾移植病人应用霉酚酸酯与硫唑嘌呤的临床疗效比较

在线全文

学校读者我要写书评

暂无评论

中国临床药理学与治疗学 2006年第3期11卷 345-347页

作者：辛海莉李萍解放军总医院第二临床药局北京100853 军事医学科学院仪器测试中心北京100850

目的:比较霉酚酸酯(MMF)、硫唑嘌呤(Aza)在肾移植病人中的临床效果。方法:肾移植术后服用霉酚酸酯、硫唑嘌呤患者各28例,均采用同服环孢菌素和泼尼松三联用药方案,每月常规监测环孢菌素A(CsA)全血浓度、血常规、肾功能、肝功能、尿常规... 详细信息

目的:比较霉酚酸酯(MMF)、硫唑嘌呤(Aza)在肾移植病人中的临床效果。方法:肾移植术后服用霉酚酸酯、硫唑嘌呤患者各28例,均采用同服环孢菌素和泼尼松三联用药方案,每月常规监测环孢菌素A(CsA)全血浓度、血常规、肾功能、肝功能、尿常规。结果:MMF组的CsA用量及其血药浓度显著低于Aza组(P<0.05),MMF组患者血肌酐(Cr)值也显著低于Aza组(P<0.05),同时MMF组对急慢性排斥反应效果较Aza组好,药物性肝损害发生率低于Aza组。结论:MMF较Aza不良反应小,减少或避免肝、肾功肾功能损害的发生机会,使肾移植的成功率明显提高。

关键词：霉酚酸酯硫唑嘌呤免疫抑制剂移植物排斥肾移植

在线全文

学校读者我要写书评

暂无评论

AS级Internet拓扑分析

通信学报 2008年第7期29卷 50-61页

作者：张昕赵海王莉菲李超东北大学信息科学与工程学院辽宁沈阳110004

Internet拓扑结构的分析,对网络的进一步应用和发展具有重大意义。通过对AS(autonomous system)级拓扑海量授权数据的大跨度时间分析,得出网络多项主要特征与节点度值间的演化联系。进一步对时间切片数据的空间分析,发现了网络层次性相... 详细信息

Internet拓扑结构的分析,对网络的进一步应用和发展具有重大意义。通过对AS(autonomous system)级拓扑海量授权数据的大跨度时间分析,得出网络多项主要特征与节点度值间的演化联系。进一步对时间切片数据的空间分析,发现了网络层次性相关的若干重要特征以及高层节点对网络拓扑的重大影响力,并通过一种层次建模方法,以实验数据论证了层次性质对网络拓扑的重要意义。结合两方面分析结果,得出AS级Internet拓扑在十分缓慢的均匀化的同时,以最高核为代表的高层节点控制着网络拓扑聚集性、幂律性、层次性等主要性质稳定的重要结论。

关键词：自治系统拓扑分析网络核心核数拓扑模型