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排序方式: 共有37条查询结果,搜索用时 15 毫秒
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Alumina coated LiNi1/3Mn1/3Co1/3O2 particles were obtained by a simple method of solid state reaction at room temperature. The reaction mechanism of solid state reaction at room temperature was investigated. The structure and morphology of the coating materials were investigated by XRD, SEM and TEM. The electrochemical performances of uncoated and Al2O3-coated LiNi1/3Co1/3Mn1/3O2 cathode materials were studied within a voltage window of 3.00-4.35 V at current density of 30 mA/g. SEM, TEM and EDS analytical results indicate that the surface of LiNi1/3Mn1/3Co1/3O2 particles is coated with very fine Al2O3 composite, which leads to the improved cycle ability though a slight decrease in the first discharge capacity is observed. It is proposed that surface treatment by solid state reaction at room temperature is a simple and effective method to improve the cycle performance of LiNi1/3Co1/3Mn1/3O2 particles. 相似文献
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针对由静止卫星、准静止卫星构成的无源定位系统,该文研究了利用到达时间差/到达频率差(TDOA/FDOA)联合对地球表面固定辐射源的无源定位算法。与迭代搜索法相比,该算法不需要初值,不用迭代运算,仅仅需要解4次多项式方程,因此该算法更有效。文中推导了定位方程的求解算法,分析了多项式方程的多根情况,并提出了相应的解决办法;最后进行了蒙特卡罗仿真,仿真结果表明该算法具有适应能力强、定位精度高的优点。 相似文献
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A technique of combination of vacuum firing and water quenching was applied to the synthesis of LiFePO4 powder. The sample was prepared by heating the pre-decomposed precursor mixtures sealed in vacuum quartz-tube, followed by water quenching at the sintering temperature. The synthetic conditions were optimized by orthogonal experiment. The results indicate that the fast quenching treatment can avoid the overgrowth of single crystal and improve its availability ratio of active material. The sintering temperature has the greatest effect on the electrochemical performance of sample. Next is the molar ratio of Li to Fe and the sintering time, respectively. The samples prepared in the optimized technical condition has the highest reversible discharge specific capacity of 149.8 mA·h/g. 相似文献
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油田企业面对日趋复杂的市场环境要继续保持其活力,就要改变以往粗放的管理方式,实施精细化管理,在每一个细节上做足功夫。才能不断节约成本,提高效益。 相似文献
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通过溶剂热法制备了ZnO纳米棒,进一步在ZnO纳米棒表面沉积碳点(C-dots)和Ag,成功制备了C-dots和Ag共修饰的ZnO纳米复合光催化剂(ZnO/C-dots/Ag)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积(BET)和紫外可见(UV-Vis)分光光谱等分析对系列样品进行了物理表征。结果表明,C-dots的引入可以有效加速Ag在ZnO表面的沉积。在白光下降解抗生素(诺氟沙星)的结果表明,ZnO/C-dots/Ag复合材料的光催化性能相比于纯的ZnO、ZnO/C-dots和ZnO/Ag材料得到了明显的提升,并且光催化性能稳定。表明C-dots和Ag在ZnO光催化降解抗生素过程中起到了协同作用,C-dots起到实现光生电子快速转移的作用,配合Ag的等离子体共振效应共同加速了ZnO的光催化降解过程。 相似文献
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媒体融合大背景下,借助多种媒体,广播能“看”已不新鲜,但广播并不是要向视频技术发展.立足于自身产品优势,拓展交互功能,以用户为中心打造电商平台,才是一条利益长远的道路. 相似文献
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With citric acid as a polymeric agent layered LiNi0.8Co0.2O2 materials were synthesized by a spray pyrolysis method. The LiNi0.sCo0.2O2 particles were characterized by means of XRD, SEM and TEM. The electrochemical performances of LiNi0.8Co0.2O2 particles were studied in a voltage window of 3.00-4.35 V and at a current density of 30 mA/g. The results show that in the pilot-scale spray pyrolysis process, the morphology of particles is dependent upon the precursor concentration and flux of carrier gas. The initial discharge capacity of the LiNi0.8Co0.2O2particles at 720 ℃ for 12 h is 187.3 mA.h/g, and the capacity remains 96.8% with excellent cycleability after 30 cycles. The LiNi0.8Co0.2O2 samples synthesized under the optimized conditions by the spray pyrolysis method shows a good electrochemical performance. 相似文献