Journal
ACS NANO
Volume 9, Issue 11, Pages 11462-11471Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05610
Keywords
ball-in-ball; hollow sphere; CuO; NiO; metal organic framework; lithium-ion battery
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Funding
- Program for Professor of Special Appointment in Shanghai (Eastern Scholar)
- National Natural Science Foundation of China [51271105, 51201095]
- Shanghai Municipal Education Commission [11SG38, 13YZ012]
- Innovative Research Team [IRT13078]
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A unique CuO@NiO microsphere with three-layer ball-in-ball hollow morphology is successfully synthesized by Cu-Ni bimetallic organic frameworks. The beforehand facile microwave-assisted production of the Ni organic framework sphere is used as the template to induce the morphology control of bimetallic oxides. Designed by the controlled surface cationic exchange reactions between Cu and Ni ions, there is an elemental gradient (decreased amount of CuO but increased amount of NiO) from the shell to the core of the microsphere product. This ternary metal oxide hollow structure is found to be very suitable for solving the critical volume expansion problem, which is critical for all high-capacity metal oxide electrodes for lithium ion batteries. A reversible larger-than-theoretical capacity of 1061 mAh.g(-1) can be retained after a repetitive 200 cycles without capacity fading compared to the initial cycle. These excellent electrochemical properties are ascribed to the step-by-step lithium insertion reactions induced by the matched CuO@NiO composition from the shell to the core and facilitated lithium/electron diffusion and accommodated volume change in the porous bimetallic oxides microsphere with a multiple-layer yolk shell nanostructure.
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