Integrated Co3O4/TiO2 Composite Hollow Polyhedrons Prepared via Cation-exchange Metal-Organic Framework for Superior Lithium-ion Batteries

Document Type

Article

Publication Date

12-20-2016

Abstract

Co3O4, as an attractive lithium ion battery anode material, though benefited from its high theoretical capacity, has long suffered from low electrical transportation and dramatic volume variations. Therefore, to develop a LIB anode material with both good capability and excellent stability, rational design of composite material is becoming an appealing method. Herein, we report a scalable method of fabricating integrated Co3O4/TiO2 composite hollow polyhedrons through a cation-exchange approach in metal-organic framework. In this synthesis, well-defined ZIF-67 particles not only serve as the host to accommodate exchanged titanium cations but also the template to form hollow polyhedron structure. The obtained integrated Co3O4/TiO2 composite hollow polyhedrons exhibit a high reversible capacity of 642 mAh/g at a rate of 500 mA/g after 200 cycles, accounting for 96.9% of the initial capacity, much higher than that of pure Co3O4, which only maintain a specific capacity of 200 mAh/g and a capacity retention of 40%. The optimized integrated Co3O4/TiO2 composite hollow polyhedrons display significant improvements in electrochemical performance, demonstrating great potential as advanced anode material for future lithium ion batteries.

Publication Source (Journal or Book title)

Electrochimica Acta

First Page

1021

Last Page

1028

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