General Liquid‐Driven Coaxial Flow Focusing Preparation of Novel Microcapsules for Rechargeable Magnesium Batteries

Abstract

Magnesium batteries have been considered promising candidates for next‐generation energy storage systems owing to their high energy density, good safety without dendrite formation, and low cost of magnesium resources. However, high‐performance cathodes with stable capacity, good conductivity, and fast ions transport are needed, since many conventional cathodes possess a low performance and poor preparation controllability. Herein, a liquid‐driven coaxial flow focusing (LDCFF) approach for preparing a novel microcapsule system with controllable size, high loading, and stable magnesium‐storage performance is presented. Taking the MoS2‐infilled microcapsule as a case study, the magnesium battery cathode based on the microcapsules displays a capacity of 100 mAh g−1 after 100 cycles. High capacity retention is achieved at both low and high temperatures of −10, ‒5, and 45 °C, and a stable rate‐performance is also obtained. The influences of the liquid flow rates on the size and shell thickness of the microcapsules are investigated; and electron and ion diffusion properties are also studied by first‐principle calculations. The presented LDCFF method is quite general, and the high performance of the microcapsules enables them to find broad applications for making emerging energy‐storage materials and secondary battery systems.

Synergy Strategy of Electrical Conductivity Enhancement and Vacancy Introduction for Improving the Performance of VS4 Magnesium-Ion Battery Cathode

“…Such results indicate that Mo-VS 4 /N-TG shows a high reversible electrochemical insertion/extraction of Mg 2+ and excellent tolerance to current mutation. In addition, the Mo-VS 4 /N-TG electrode also shows a higher rate performance compared to the other reported cathode materials, and the intuitive comparison diagram is shown in Figure f. ,,− Figure g shows the cyclic performances of three electrodes evaluated at 50 mA g –1 . Mo-VS 4 /N-TG delivers a stable specific capacity of about 140 mAh g –1 after 600 cycles.…”

A novel rose-with-thorn ternary MoS2@carbon@polyaniline nanocomposite as a rechargeable magnesium battery cathode displaying stable capacity and low-temperature performance

“…4,5 In order to address these problems, a large number of studies have been conducted. 6,7 In view of the low crystallinity of the cathode materials, even small changes in the preparation process will cause huge differences in the performance. Studies have been conducted to accelerate the extraction of Mg ions to promote the performance of batteries.…”

Co–Salen Complex-Derived CoP Nanoparticles Confined in N-Doped Carbon Microspheres for Stable Sodium Storage

“…As shown in Figure c, the nitrogen adsorption isotherm of CoP/NC microspheres belongs to the type IV isotherm . Most of the pore size is about 13 nm, and the pore structure is conducive to the penetration of electrolyte . The CoP content in CoP/NC microspheres was further analyzed by thermogravimetric analysis (TGA) (Figure d).…”

“…38 Most of the pore size is about 13 nm, and the pore structure is conducive to the penetration of electrolyte. 39 The CoP content in CoP/NC microspheres was further analyzed by thermogravimetric analysis (TGA) (Figure 2d). The slight weight loss before 200 °C is mainly due to the evaporation of water in the material.…”