期刊
ADVANCED SCIENCE
卷 8, 期 2, 页码 -出版社
WILEY
DOI: 10.1002/advs.202002298
关键词
energy storage; microcapsules; microfluidic method; secondary batteries
资金
- Science and Technology Major Project of Anhui Province [18030901093]
- Key Research and Development Program of Wuhu [2019YF07]
- Natural Science Research Project for Universities in Anhui Province [KJ2018ZD034, KJ2019A0502]
- Foundation of Anhui Laboratory of Molecule-Based Materials [FZJ19014]
- National Natural Science Foundation of China [51672176, 21901157]
- University of Science and Technology of China
A novel microcapsule system with stable magnesium storage performance for magnesium battery cathodes is prepared using a liquid-driven coaxial flow focusing approach. The MoS2-filled microcapsules display high performance and stable cycling performance at various temperatures. This method is versatile and could find broad applications in emerging energy storage materials and secondary battery systems.
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 degrees 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.
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