Ag掺杂VO2(B)正极材料的合成及其电化学性能

以V_2O_5、C_(12)H_(22)O_(11)和AgNO_3为原料,采用水热法制备Ag掺杂VO_2(B)正极材料,通过XRD、FESEM、XPS、EDS、循环伏安(CV)、交流阻抗(EIS)等表征手段,研究掺Ag对VO_2(B)的结构、形貌及电化学性能的变化规律。结果表明,当掺杂量为0.43%(atom)时,样品(Ag_1)首次放电比容量为340.5 m A·h·g^(-1),较未掺杂样品(Ag_0)提高了80.5%。当掺杂量为1.28%(atom)时,样品(Ag_3)表现出最好的循环稳定性,首次放电容量为213.6 m A·h·g^(-1),100次循环后,容量保持率为58.3%。

cBN-Ti-Al-Si原位合成PcBN复合材料及其力学性能

将立方氮化硼微粉和Ti、Al、Si微粉按照不同的质量比进行混料,在高温(1 500℃)、超高压(5GPa)下进行原位烧结。利用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)以及X射线色散能谱(EDS)对烧结体的物相构成、显微结构以及各类元素分布进行了分析,并测试了样品的气孔率、相对密度、抗弯强度和显微硬度。研究结果表明,cBN-Ti-Al-Si体系在1 500℃下出现了新物相(TiB_2、AlN、TiSi_2、Ti_5Si_3、Si_3N_4)。通过对不同配方体系进行研究可以确定,当Si含量为15%(质量分数)时,PcBN的综合性能最好,其中显微硬度为34.58GPa,抗弯强度为799 MPa,气孔率为0.21%,相对密度为98.5%;当体系中的Si含量为20%(质量分数)时,PcBN的性能急剧下降。

Combustion synthesis of fine TiFe series alloy powder by magnesothermic reduction of ilmenite

Fine TiFe series alloy powder was fabricated by magnesothermic reduction of ilmenite as main raw material.Adiabatic temperature of the FeTiO_(3)-Mg system was studied through thermodynamic analysis.Meanwhile,the characteristics of TiFe series alloy were described by XRD,SEM and grading analysis.It is shown that combustion synthesis of the FeTiO_(3)-Mg system can carry out due to its strong exothermic reaction through adiabatic temperature calculate.Ultrafine TiFe series alloy powder after leached for 5 h has reasonable phases and morphology with the particle distribution of 0.2 to 1μm.It indicates that in-situ magnesothermic reduction of natural ilmenite is a feasible way to fabricate ultrafine powder with a relatively lower cost.

Ribbon-like Cu doped V6O13 as Cathode Material for High-performance Lithium Ion Batteries

Ribbon-like Cu doped V6O（13） was synthesized via a simple solvothermal approach followed by heat treatment in air.As an cathode material for lithium ion battery,the ribbon-like Cu doped V6O（13 ）electrode exhibited good capacity retention with a reversible capacity of over 313 m Ah·g^-1 for up to 50 cycles at 0.1C,as well as a high charge capacity of 306 m Ah·g^-1 at a high current rate of 1 C,in comparison to undoped V6O（13 ）electrode（267 m Ah·g^-1 at 0.1C and 273 m Ah·g^-1 at 1 C）.The high rate capability and better cycleability of the doped electrode can be attributed to the influence of the Cu ions on the mophology and the electronic conductivity of V6O（13） during the lithiation and delithiation process.

Morphology Controlled Synthesis and Characterization of Bi_2WO_6 Photocatalysts

Nest-like and multilayered-disk-like Bi2WO6 photocatalysts were synthesized through a hydrothermal strategy using thiourea and acetic acid as complexing agents. The nest-like Bi2WO6 showed excellent visible-light-driven photocatalytic performance, and it could decompose rhodamine B（RhB） within 100 minutes. This excellent performance resulted from its special microstructure and the relatively large surface area.

Mass Production of Bi3NbO7/Bi2Zn(2/3)Nb(4/3)O7 Composites and Their Visible-light Photocatalytic Activity

Series Bi3NbO7/Bi2Zn（2/3）Nb（4/3）O7 （BN/BZN） composites were synthesized through a facile solid state reaction method. The products were characterized by X-ray diffraction（XRD）, field emission scanning electron microscopy（FE-SEM） and UV-vis diffuse reflectance spectroscopy（DRS）. When BN： BZN=0.1 mole ratio, the BN/BZN composite showed the best visible-light-driven photocatalytic performance, which decomposed nearly 100% of Rh B（10 ppm, p H=3-4） within 40 min. The results demonstrated that in-situ solid state synthesis of BN/BZN composites could be an efficient strategy to develop new photocatalyst for environmental remediation.

水热法制备Al/Co共掺杂VO2（B）正极材料及其电化学性能

采用水热法,以V2O5、C12H22O11、Co(NO3)2·6H2O、Al(NO3)3·9H2O为原料,分别合成了纯相VO2(B)和Al/Co共掺杂VO2(B)。X射线衍射分析结果显示,掺杂后样品的衍射峰强度变低、峰形变宽、结晶性下降。扫描电子显微镜照片显示,掺杂后样品的形貌发生明显变化,由长棒状(纯相)变为短棒状与片状均匀混合的形貌。电化学性能测试结果显示首次放电比容量和循环性能都大幅度提高。样品A1(摩尔比n(Al):n(Co):n(V)=12:6:100)首次放电比容量为301 mA·h/g,比未掺杂样品(216 mA·h/g)高85 mA·h/g;样品A2(摩尔比n(Al):n(Co):n(V)=12:12:100)首次放电比容量为285 mA·h/g,比未掺杂样品高69 mA·h/g,并且掺杂样品经过100次充放电循环后容量保持率都比未掺杂样品高。