期刊
NANOMATERIALS
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/nano12020236
关键词
secondary battery; nanocomposite; microcapsule; capacity; stability
类别
资金
- Key Research and Development Program of Wuhu [2019YF07]
- Natural Science Research Project for Universities in Anhui Province
- National Key R&D Program of China [2021YFC2100100]
- National Natural Science Foundation of China [21901157]
- Shanghai Science and Technology Project of China [21JC1403400]
- University Synergy Innovation Program of Anhui Province [GXXT-2020-073]
- Foundation of Anhui Laboratory of Molecule-Based Materials [FZJ21012]
In this study, a unique microcapsule encapsulated with Co3O4 nanocages derived from metal organic frameworks (MOFs) was reported for a Li-S battery, showing excellent lithium storage performance. The microcapsules, filled with Co3O4/S after loading sulfur, exhibited a specific capacity of 935 mAh g(-1) after 200 cycles at 0.5C in Li-S batteries, with a Coulombic efficiency of about 100%. The constructed Li-S battery demonstrated high rate-performance and stable performance under high and low temperatures.
Long-term stable secondary batteries are highly required. Here, we report a unique microcapsule encapsulated with metal organic frameworks (MOFs)-derived Co3O4 nanocages for a Li-S battery, which displays good lithium-storage properties. ZIF-67 dodecahedra are prepared at room temperature then converted to porous Co3O4 nanocages, which are infilled into microcapsules through a microfluidic technique. After loading sulfur, the Co3O4/S-infilled microcapsules are obtained, which display a specific capacity of 935 mAh g(-1) after 200 cycles at 0.5C in Li-S batteries. A Coulombic efficiency of about 100% is achieved. The constructed Li-S battery possesses a high rate-performance during three rounds of cycling. Moreover, stable performance is verified under both high and low temperatures of 50 degrees C and -10 degrees C. Density functional theory calculations show that the Co3O4 dodecahedra display large binding energies with polysulfides, which are able to suppress shuttle effect of polysulfides and enable a stable electrochemical performance.
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