Journal
DALTON TRANSACTIONS
Volume 45, Issue 39, Pages 15317-15325Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt02058e
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Funding
- NSFC [51302153, 51572151, 51272128]
- Outstanding Youth Science and Technology Innovation Team Project of Hubei Educational Committee [T201603]
- Opening Project of CAS Key Laboratory of Materials for Energy Conversion [CKEM131404]
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Monoclinic Li3V2(PO4)(3)/C (LVP/C) and Li3V1.95Fe0.05(PO4)(3)/C (LVFP/C) composites were successfully modified by cobalt incorporation. The effects of cobalt incorporation on the structure, morphology and electrochemical performance of the LVP/C and LVFP/C composites were systematically investigated. The results show that most Co exists in the form of CoO and forms a hybrid layer with the carbon coating on the surface of the LVP and LVFP particles; moreover, a small part of Co enters into the LVP or LVFP lattices due to atomic diffusion. Compared with LVP/C and LVFP/C, Co-incorporated samples exhibit better electrochemical performance. In particular, under the common effect of doping and a hybrid layer (carbon and metal oxides) coating, the LVFP/C-Co electrode displays a prominent initial capacity of 124.7 mA h g(-1) and a very low capacity fading of similar to 0.04% per cycle even after 500 cycles at 20 degrees C. This novel co-modification method with cation doping and a hybrid layer (carbon and metal oxide) coating is a highly effective way to improve the electrochemical performance and has great potential to be easily used to modify other cathode materials with poor electrical conductivity.
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