Yaran Yin,Chunying Zhu,Rongwei Guo,Taotao Fu,Youguang Ma
The dynamics of the gas-liquid two-phase flow are of great significance for the heat and mass transfer performance in a microreactor. In this paper, the flow pattern, void fraction and frictional pressure drop of gas-liquid two-phase flow of CO 2 and MEA/[Bmim][BF 4 ] aqueous solution accompanied by the chemical reaction in a 400 μm square microchannel were investigated experimentally by a high-speed camera and pressure sensor. Three kinds of flow regimes were observed: slug-bubbly flow, slug flow and slug-annular flow. The void fraction and frictional pressure drop in the slug flow regime were mainly investigated, and the applicability of models without consideration of the mass transfer proposed in the literature was assessed. Considering the effect of chemical absorption, two correlations were proposed with the Hatta number for predicting the two-phase void fraction and Chisholm parameter C , which showed good prediction performance.
Solid-state lithium-metal batteries, with their high theoretical energy density and safety, are highly promising as a next-generation battery contender. Among the alternatives proposed as solid-state electrolyte, lithium-rich anti-perovskite (LiRAP) materials have drawn the most interest because of high theoretical Li + conductivity, low cost and easy processing. Although solid-state electrolytes are believed to have the potential to physically inhibit the lithium dendrite growth, lithium-metal batteries still suffer from the lithium dendrite growth and thereafter the short circuiting. The voids in practical LiRAP pellets are considered as the root cause. Herein, we show that reducing the voids can effectively suppress the lithium dendrite growth. The voids in the pellet resulted in an irregular Li + flux distribution and a poor interfacial contact with lithium metal anode; and hence the ununiform lithium dendrites. Consequently, the lithium-metal symmetric cell with void-reduced Li 2 OHCl-HT pellet was able to display excellent cycling performance (750 h at 0.4 mA cm −2 ) and stability at high current density (0.8 mA cm −2 for 120 h). This study provides not only experimental evidence for the impact of the voids in LiRAP pellets on the lithium dendrite growth, but also a rational pellet fabrication approach to suppress the lithium dendrite growth.
危险品化学品经营许可证（带存储）