Study of polyethylene coating to improve the cycle stability of Ni-rich cathode for Li-ion batteries

Journal of Solid State Electrochemistry - Ni-rich cathode materials can be used to manufacture high energy density lithium-ion batteries because of their higher specific capacity. However, Ni-rich...     

二维不可压缩磁流体方程边界层分离的条件

该文研究了二维不可压缩磁流体方程的解,其中要求磁流体的速度满足Dirichlet边界条件、磁场在边界上的值与时间无关. 利用Taylor展开式和不可压缩流的结构分歧理论, 得到了磁流体方程发生边界层分离的条件, 它取决于外力、初值和磁场在边界上的取值, 并且该条件可以预测磁流体边界层分离发生的时间与地点.     

Improved electric properties in BiFeO3 films by the doping of Ti

We prepared BiFe_1−x Ti _x O_3+δ (BFTO) films by sol gel process and various oriented films were deposited on LaNiO₃ coated SiO₂/Si substrates with different x. The effects of Ti substitution on dielectric, ferroelectric, magnetic and leakage conduction properties in BFTO system have been studied. Enhanced ferroelectricity was observed at room temperature due to the substitution of Ti. The largest double remnant polarization of 3.8 μC/cm² was acquired in the film with x = 0.10. Further more, it was observed that the dielectric constants were also enhanced by the substitution of Ti. The film with x = 0.10 has the largest dielectric constant below 100 kHz and Debye-like relaxation were observed in the films with x = 0.05 and 0.10. The leakage conduction was reduced with the increasing of the content of Ti. More over, the magnetism was also altered by the substitution.