Synthesis and Electrochemical Behaviors of a-MoO_3 Nanobelts/Carbon Nanotubes Composites for Lithium Ion Batteries

α-MoO_3 nanobelts/carbon nanotubes(CNTs) composites were synthesized by simple hydrothermal method followed by CNTs incorporating, and characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Cyclic voltammogram(CV), electrochemical impedance spectroscopy(EIS), and galvanostatic charge/discharge testing techniques were employed to evaluate the electrochemical behaviors of α-MoO_3 nanobelts/CNTs composites. The results exhibited that compared to bare α-MoO_3 nanobelts, the α-MoO_3 nanobelts/CNTs composites have better electrochemical performances as cathode materials for lithium ion battery, maintaining a reversible specific capacity of 222.2 mAh/g at 0.3 C after 50 cycles, and 74.1% retention of the first reversible capacity. In addition, the Rct value of the α-MoO_3 nanobelts/CNTs is 13 Ω, much lower than 66 Ω of the bare α-MoO_3 nanobelts. The better electrochemical performances of the α-MoO_3 nanobelts/CNTs composites can be attributed to the effects of the high conductive CNTs network.     

Synthesis and electrochemical behaviors of <Emphasis Type="Italic">α</Emphasis>-MoO<Subscript>3</Subscript> nanobelts/carbon nanotubes composites for lithium ion batteries

α-MoO₃ nanobelts/carbon nanotubes (CNTs) composites were synthesized by simple hydrothermal method followed by CNTs incorporating, and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Cyclic voltammogram (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge testing techniques were employed to evaluate the electrochemical behaviors of α-MoO₃ nanobelts /CNTs composites. The results exhibited that compared to bare α-MoO₃ nanobelts, the α-MoO₃ nanobelts/CNTs composites have better electrochemical performances as cathode materials for lithium ion battery, maintaining a reversible specific capacity of 222.2 mAh/g at 0.3 C after 50 cycles, and 74.1% retention of the first reversible capacity. In addition, the Rct value of the α-MoO₃ nanobelts/ CNTs is 13 Ω, much lower than 66 Ω of the bare α-MoO₃ nanobelts. The better electrochemical performances of the α-MoO₃ nanobelts /CNTs composites can be attributed to the effects of the high conductive CNTs network.     

基于快速原型的金属粉浆无压浇注成型与烧结

通过快速成型技术与硅橡胶软模技术首先制得试样的硅橡胶模具,然后将由铁粉与树脂粘结剂混合而成的粉浆浇注进硅橡胶模具中翻制试样的型坯,再对型坯进行烧结制取内部孔隙均匀的金属骨架状型坯。在试验对比的基础上,探讨了金属粉浆无压浇注成型与烧结工艺中树脂粘结剂的选用、金属粉的选用、粉浆浇注与烧结等问题。结果表明:199聚脂树脂较适合作为该工艺的粘结剂,同时双组分混合铁粉较单一铁粉更有利于形成孔隙均匀的骨架状型坯的烧结成型。     

稳定剂对96Al2O3陶瓷表面化学镀铜的影响

为改善甲醛、酒石酸钾钠体系的镀液稳定性,实验研究了分别添加及同时添加甲醇、亚铁氰化钾两种稳定剂,对96Al2O3陶瓷基片化学镀铜的沉积速度、外观及镀液稳定性的影响.结果证明,单一加入甲醇能很好改善镀液稳定性,适量的甲醇还能提高沉积速度;单一加入亚铁氰化钾也能明显改善镀液稳定性,而且还能改善镀层外观质量,但沉积速度下降;同时添加两稳定剂,可在沉积速度不降低的前提下,明显改善了镀液稳定性和镀层外观质量.