Researchers from the University of California, Riverside and the University of Science and Technology of China synthesized monodisperse V2O5 microspheres with a porous structure. Used as a cathode material for lithium-ion batteries (LIBs), the material shows a stable and highly reversible capacity. It also shows excellent low-temperature behavior with a reversible capacity of 102 mA h g-1 at -20 °C.
In a paper published in the RSC Journal of Materials Chemistry, the team attributes the excellent performance to the porous structure of the V2O5 spheres, which are more electrochemically active due to a large interfacial contact area with the electrolyte.
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| SEM images of the V2O5 porous spheres with particle size of ~450 nm (a), and ~700 nm (b). Wang et al. Click to enlarge. |
We believe the strategy of creating porosity may be extended to other electrode materials to improve the performance of lithium ion batteries.
—Wang et al.
The team synthesized the microspheres via a simple hydrolysis method with a subsequent reduction/oxidation treatment at high temperatures.
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| Galvanostatic cycling results of monodisperse porous V2O5 microspheres in the range of 1.5-4.0 V: (a) first discharge curve at the voltage range of 1.5-4.0 V, (b) cycling performance. Wang et al. Click to enlarge. |
Resources
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Suqing Wang, Zhenda Lu, Da Wang, Chunguang Li, Chunhua Chen and Yadong Yin (2011) Porous monodisperse V2O5 microspheres as cathode materials for lithium-ion batteries
J. Mater. Chem., 2011, Advance Article doi: 10.1039/C0JM04398B