Controllable synthesis of mesostructures from TiO2 hollow to porous nanospheres with superior rate performance for lithium ion batteries

Ren, Hao and Sun, Jiajia and Yu, Ranbo and Yang, Mei and Gu, Lin and Liu, Porun and Zhao, Huijun and Kisailus, David and Wang, Dan (2015) Controllable synthesis of mesostructures from TiO2 hollow to porous nanospheres with superior rate performance for lithium ion batteries. Chemical Science, 7 (1). pp. 793-798. ISSN 2041-6520

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Abstract

Uniform TiO2 nanospheres from hollow, core-shell and mesoporous structures have been synthesized using quasi-nano-sized carbonaceous spheres as templates. The TiO2 nanospheres formed after calcination at 400 °C are composed of ∼7 nm nanoparticles and the shells of the hollow TiO2 nanospheres are as thin as a single layer of nanoparticles. The ultrafine nanoparticles endow the hollow and mesoporous TiO2 nanospheres with short lithium ion diffusion paths leading to high discharge specific capacities of 211.9 and 196.0 mA h g-1 at a current rate of 1 C (167.5 mA g-1) after 100 cycles, and especially superior discharge specific capacities of 125.9 and 113.4 mA h g-1 at a high current rate of up to 20 C. The hollow and mesoporous TiO2 nanospheres also show superior cycling stability with long-term discharge capacities of 103.0 and 110.2 mA h g-1, respectively, even after 3000 cycles at a current rate of 20 C.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made available under Open Access.
Faculty / Department / School: No Faculty
Date Deposited: 16 Jun 2017 02:06
Last Modified: 16 Jun 2017 02:06
Uncontrolled Keywords: Carbonaceous spheres; Controllable synthesis; Discharge capacities; Discharge specific capacity; High current rates; Lithium ion diffusion; Mesoporous structures; Ultra-fine nanoparticles; Lithium and Alloys; Electric Batteries; Secondary Batteries; Nanotechnology; Inorganic Compounds; Solid State Physics;
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030302 Nanochemistry and Supramolecular Chemistry
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1039/c5sc03203b
URI: http://eprints.usq.edu.au/id/eprint/31944

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