Journal
CHEMELECTROCHEM
Volume 6, Issue 14, Pages 3657-3666Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201900915
Keywords
metal-organic frameworks; hollow structure; lithium-ion battery; kinetic analysis
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Funding
- National Natural Science Foundation of China [21403046]
- China Postdoctoral Science Foundation [2012M520728]
- open project of Jilin Province Key Laboratory of Organic Functional Molecular Design Synthesis [130028649]
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Metal-organic frameworks (MOFs)-derived materials are widely applied in functional materials with noble structures. Here, a well-designed strategy for generating hierarchical double-shelled nanoboxes is reported. Starting from the construction of hierarchical MOF-on-MOF architecture followed by a post-annealing treatment, hierarchical TiO2@Co3O4 nanoboxes are successfully synthesized with an interior TiO2 shell supporting the outer hollow-Co3O4-aggregates shell with a CoTiO3 intermediate layer. The TiO2@Co3O4 electrode displays a superior lithium storage performance in terms of high reversible capacity (920.5 mAh g(-1) after 150 cycles at 200 mA g(-1), 58.6 % higher than theoretical capacity), outstanding high-rate long-term cycling stability (838.6 mAh g(-1) after 600 cycles at 1000 mA g(-1), 44.5 % higher than theoretical capacity), and remarkable rate capability (good restorability at 2000 mA g(-1)). Furthermore, the morphology and electrochemical kinetic analysis proves that TiO2@Co3O4 has a more stable structure, higher capacitive contribution, and better Li-ion diffusion, which enhance the lithium-storage performance.
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