隔膜中残油量对锂电池性能的影响

锂离子电池隔膜在锂离子电池中主要起隔绝正负极防止短路和允许锂离子导通的作用[1],因此,锂离子电池隔膜品质的优劣直接影响到锂离子电池的应用性能。在锂电池隔膜制备的过程中,以石蜡油作为造孔剂,用热致相分离法制备聚乙烯微孔膜,石蜡油的残留不可避免。本文研究了隔膜中石蜡油的残留量对电池自放电、倍率放电、高温存储、循环性能等应用性能的影响。研究结果表明,残油量越低锂电池的应用性能越优。     

HA coating on titanium with nanotubular anodized TiO2 intermediate layer via electrochemical deposition

Hydroxyapatite（HA） coating has been prepared on titanium substrate through an electrochemical deposition approach. In order to improve the bonding strength between HA coating and Ti substrate, a well oriented and uniform titanium oxide nanotube array on the surface of titanium substrate was applied by means of anodic oxidation pre-treatment. Then the calcium hydrogen phosphate（CaHPO4·2H2O, DCPD） coating, as the precursor of hydroxyapatite coating, was electrodeposited on the anodized Ti. At the initial stage of electro-deposition, the DCPD crystals, in nanometer precipitates, are anchored in and between the tubes. With increasing the deposition time, the nanometer DCPD crystals are connected together to form a continuous coating on titanium oxide nanotube array. Finally, the DCPD coating is converted into hydroxyapatite one simply by being immersed in alkaline solution.     

二氧化钛纳米管上电沉积羟基磷灰石

在NaF和H3PO4水溶液体系中,用电化学阳极氧化法在钛板表面形成一层结构规整有序的高密度TiO2纳米管阵列.随后在阳极氧化的钛基材表面沉积磷酸钙盐涂层,再经碱热处理使磷酸钙涂层转变为羟基磷灰石涂层.扫描电镜(SEM)观察了TiO2纳米管的微观结构以及生成的羟基磷灰石的形貌,X射线衍射仪(XRD)分析了涂层的相组成,电化学工作站(CHI660)研究了试样在模拟体液中的极化行为.结果显示,Ti金属表面制备的规整的TiO2管直径约100nm左右.电沉积涂层CaHPO4·2H2O经碱处理后转变为羟基磷灰石.     

钛基材上电化学沉积羟基磷灰石

通过电沉积法在经过阳极氧化的钛基材表面沉积磷酸钙盐涂层,再经碱热处理使磷酸钙涂层转变为羟基磷灰石涂层。扫描电镜(SEM)观察了阳极氧化后生成的TiO2纳米管的微观结构,以及生成的羟基磷灰石的形貌。X射线衍射仪(XRD)分析了涂层的相组成,同时测定了涂层与基体的结合强度。试验结果表明:电沉积涂层CaHPO4·2H2O经碱处理后转变为羟基磷灰石;电沉积添加双氧水与钛基材经过阳极氧化后使得涂层与基体结合强度有所提高。模拟体液浸泡试验表明涂层具有良好的生物活性。     

添加NH4HCO3对多孔Ti-10%Mg复合材料的孔隙特征和压缩性能的影响（英文）

添加碳酸氢铵粉末,采用冶金法制备多孔钛-镁复合材料,并对多孔复合材料的性能进行综合考察。采用X射线衍射(XRD)和扫描电子显微镜(SEM)对孔隙特性和压缩性能进行表征。结果表明,通过调节碳酸氢铵的加入量可以控制该多孔材料的孔隙率;碳酸氢铵对多孔Ti-10%Mg的微观结构和相组成没有影响;多孔材料的开孔率和抗压强度随着碳酸氢铵的添加量和粒径的变化而变化。当碳酸氢铵添加量为25%(质量分数)时,得到孔隙率约50%的多孔材料的抗压强度与抗压模量与人骨的相似。