NDLI: Hierarchical donut-shaped LiMn2O4 as an advanced cathode material for lithium-ion batteries with excellent rate capability and long cycle life

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Hierarchical donut-shaped LiMn2O4 as an advanced cathode material for lithium-ion batteries with excellent rate capability and long cycle life

Content Provider	Semantic Scholar
Author	Sun, Weiwei Liu, Huiqin Peng, Tao Liu, Yumin Bai, G. Meenambika Kong, Sen Guo, Shishang Li, Meiya Zhao, Xingzhong
Copyright Year	2015
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.
Starting Page	8165
Ending Page	8170
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1039/C5TA00752F
Volume Number	3
Alternate Webpage(s)	http://www.rsc.org/suppdata/c5/ta/c5ta00752f/c5ta00752f1.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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