薄膜型锂离子电池正极材料研究进展

简要介绍了近年来磁控溅射和脉冲激光沉积制膜技术在薄膜型锂离子电池正极材料制备方面的应用研究; 对制膜新工艺及新型正极材料的研究现状进行了概括,认为现阶段新型材料LiFePO4有希望成为薄膜锂电池正极材料的首选,并展望了薄膜型锂离子电池的发展前景.     

全固态薄膜锂离子电池正极材料研究进展

全固态薄膜锂离子电池是锂离子电池的最新研究领域,正极材料的薄膜化成为锂离子电池的重要组成部分和研究热点.主要综述了LiCoO2、LiNiO2、LiMn2O4、v2O5、金属磷酸盐化合物等薄膜正极材料近几年来在材料改性、制备工艺等方面的研究状况,并展望了其发展趋势.     

LiNiO2正极材料的制备技术及进照

LiNiO2被认为是当前最具吸引力的锂离子电池正极材料之一.概述了LiNiO2正极材料的制备技术,重点介绍了软溶液工艺的几种技术(包括水热技术、电化学技术和水热电化学技术)在制备LiNiO2薄膜中的应用和特点,并对LiNiO2正极材料制备技术的发展趋势进行了展望.     

溶胶-凝胶法制备锂离子电池正极材料研究进展

随着社会的迅速发展，能源短缺和环境恶化两大问题严重制约了全球社会文明发展以及经济发展。锂离子电池具有能量密度高、自放电率小、无记忆效应、循环性能好等诸多优点，广泛应用于各种电子设备、新能源汽车、储能系统等领域。锂离子电池的正极材料直接决定了电池的性能，研究正极材料的制备方法至关重要。综述了溶胶-凝胶法制备锂离子电池正极材料的研究进展以及溶胶-凝胶法改性正极材料的制备，并对溶胶-凝胶法制备锂离子电池正极材料未来的研究方向进行展望。     

分子层沉积纳米薄膜的现状和发展

随着微电子技术、锂离子电池和太阳能电池等行业的发展,人们对聚合物薄膜,尤其是纳米级聚合物薄膜的要求也越来越高。在传统的沉积方法不能满足要求的条件下,找到新的沉积聚合物的方法势在必行。分子层沉积(MLD)是一种类似于原子层沉积的技术,它可以精确控制聚合物膜的厚度、组成、形貌和保形性。因此,MLD可以成为制备聚合物薄膜的一种新方法。本文综述了分子层沉积的原理和方法,以及在薄膜领域的发展和应用,最后给出了分子层沉积技术未来发展所面对的挑战和展望。     

废旧三元锂离子电池正极材料回收技术研究进展

三元锂离子电池因其性能优越,在国内外便携式电子设备和新能源汽车中得到广泛应用.随着对锂离子电池需求量的不断增大,大量的锂离子电池将迎来"退役"高峰期.为实现有价金属资源的循环利用,降低固体废物处理对环境的影响,废旧锂离子电池的回收利用受到了广泛的关注.通过对三元锂离子电池进行资源化回收利用,可以获得有价金属或直接制备电池材料.为了提高物料的有效回收率,通常采用预处理的方法来分离集流体和正极活性材料,实现物料的有效分离及进一步的后处理.然后,采用冶金处理的方法从正极活性材料中提取金属和分离杂质,其包括高温冶金和湿法冶金处理工艺.最后,结合材料合成的方法进一步制备得到电池材料或化合物.在现阶段的研究中,高温冶金过程面临着物料损耗大、能耗高、环境不友好等问题;湿法冶金过程存在酸耗大、除杂效率低、工艺流程长等问题.正极材料的再生过程、回收成本以及再合成材料的性能是限制其应用的重要因素.本文主要介绍了废旧三元锂离子电池回收过程及方法,包括预处理、高温冶金、湿法冶金、正极材料再生等,分析比较了其存在的主要问题,为废旧三元锂离子电池的资源化技术发展提供参考.最后,提出了废旧三元锂离子电池正极材料的回收应向绿色环保、短流程和低能耗的方向发展.     

锂离子电池正极材料LiMn2O4的制备技术及其研究进展

尖晶石LiMn2O4是最有希望替代LiCoO2的新一代锂离子电池的正极材料。本文对锂离子电池的工作原理和3种正极材料作了简要介绍。综述了近年来LiMn2O4制备技术的研究进展,并对其今后的发展进行了展望。     

用电泳沉积方法制备LiCoO2薄膜

将LiCoO2粉末分散在异丙醇溶剂中电泳沉积,在铝箔阴极上制备出了LiCoO2薄膜.研究了pH值、悬浮液浓度、外加电压和时间等工艺参数对单位面积膜层质量的影响,初步探讨了Li-CoO2的电泳沉积机理.研究发现:悬浮液中不加HCl时,LiCoO2不能从异丙醇悬浮液中电泳沉积出来;LiCoO2的沉积量随悬浮液的pH值减小而增加,随悬浮液浓度、外加电压的增大和时间的延长呈线性增加.通过SEM分析发现,电泳沉积得到的LiCoO2薄膜不很致密,但作为锂离子电池正极材料使用是完全可以满足要求的.     

LiNiO2正极材料的制备技术及进展

LiNiO2被认为是当前最具吸引力的锂离子电池正极材料之一。概述了LiNiO2正极材料的制备技术，重点介绍了软溶液工艺的几种技术（包括水热技术、电化学技术和水热电化学技术）在制备LiNiO2薄膜中的应用和特点，并对LiNiO2正极材料制备技术的发展趋势进行了展望。     

4种正极材料对锂离子电池性能的影响及其发展趋势

锂离子电池正极材料是锂离子电池发展的关键.从4种正极材料的安全性能、循环性能、存在的问题等方面评述了正极材料对锂离子电池发展起的作用和未来的发展趋势,其中钴酸锂和镍酸锂将依然会占据着小型电池市场的地位,而锰酸锂和磷酸铁锂将会促进大型电池市场的发展.此外,纳米技术在动力电池上的应用也将给电池带来较好的应用前景.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.