期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 15, 页码 8165-8170出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00752f
关键词
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资金
- National Basic Research Program of China (973 Program) [2011CB 933300]
- National Natural Science Foundation of China [51132001, 51272184, 81272443]
- Ph.D. Programs Foundation of Ministry of Education of China [20130141110059]
- National Science Fund for Talent Training in Basic Science [J1210061]
- Fundamental Research Funds for the Central Universities [2042014kf0235]
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.
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