Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11134
Title: Hierarchical donut-shaped LiMn2O4 as an advanced cathode material for lithium-ion batteries with excellent rate capability and long cycle life
Authors: Sun, W
Liu, H
Peng, T
Liu, Y
Bai, G
Kong, S
Guo, S
Li, M
Zhao, XZ
Issue Date: 2015
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry A, 2015, v. 3, no. 15, p. 8165-8170 How to cite?
Journal: Journal of materials chemistry A 
Abstract: Porous micrometer-sized architecture that consists of aggregated single-crystalline nanoparticles is critical for LiMn2O4 to achieve good rate capacity and cycling stability, since it can increase the contact area between the electrolyte/electrode and shorten the transport paths for electrons and lithium ions. In this paper, hierarchical porous donut-shaped LiMn2O4 comprising aggregated single-crystalline nanoparticles has been successfully fabricated with MnO2 nanosheet coated polystyrene spheres as a precursor and characterized in terms of structure and performance as the cathode for lithium ion batteries. The charge/discharge tests show that the as-obtained donut-shaped LiMn2O4 exhibits excellent rate capability and high-rate cyclic stability. Surprisingly, even at a high charge/discharge rate of 10 C, the battery yields a capacity retention of over 95% after 500 cycles. The superior performance of the synthesized product can be attributed to its intrinsic structure: porous donut-shaped LiMn2O4 consisting of well-connected single-crystalline nanoparticles. The interpenetrating nanoparticle reduces the path of Li ion diffusion and increases the number of reaction sites for lithium insertion/extraction; the pores provide void space to buffer the volume changes during high-rate charge/discharge.
URI: http://hdl.handle.net/10397/11134
ISSN: 2050-7488
EISSN: 2050-7496
DOI: 10.1039/c5ta00752f
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