Porous nanostructured WO 3 coatings were deposited by two routes, solution and suspension plasma spraying. The nanostructural characteristics of the coatings were tunable by adjusting the constituents of the starting liquid precursor and spray parameters. Planar or spherical WO 3 grains with controllable sizes in nano-scale have been fabricated. Complete formation of spherical WO 3 grains was attained during solution plasma spraying. Enhanced heating of the nano-WO 3 particles by augmenting plasma power gave rise to oriented WO 3 grain growth along (0 0 2) plane. The planar WO 3 grains with the dimension of ~50 nm, ~80 nm, and ~700 nm in thickness, width, and length respectively were fabricated by the suspension plasma spraying. The results provide clear insight into potential gas-sensing applications of the porous WO 3 coatings.
Yulin He,Ying Li,Yaochun Liu,Nianchun Yao,Jiamei Li,Yang Liu
Inspired by the WO 3 transition metal semiconductor, a simple liquid phase WO 3 coating strategy is introduced to improve the surface stability of LiNi 0.5 Co 0.2 Mn 0.3 O 2 . The electrochemical performance of WO 3 -coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 is improved at both a high cut-off voltage (4.5 V) and high temperature (50 °C). With the WO 3 (0.6 wt%) coating amount optimized, the material capacity retention is maintained at 138 mAh g −1 and 170.9 mAh g −1 at 25 °C and 50 °C after 200 cycles compared with 107.8 mAh g −1 and 143.9 mAh g −1 , respectively, for pristine NCM523. The WO 3 -coated sample also exhibits a better rate capability, maintaining 126 mAh g −1 at 25 °C in the voltage range of 3–4.5 V at the current density of 5 C. The enhanced properties of the WO 3 -coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 due to the WO 3 coating layer result from the interface that prevents immediate contact between the electrolyte and the active material as well as the lower polarization and electrochemical resistance of the battery. SEM, TEM, XPS and EIS further reveal these improved electrochemical performances, which indicate the success of the approach for regenerating NCM523.
危险品化学品经营许可证（带存储）