Journal
SOLID STATE IONICS
Volume 327, Issue -, Pages 71-75Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2018.10.029
Keywords
Lithium-ion batteries; LiVPO4F cathode; Carbon coating; Nanoparticles; Ni+-storage performance
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Funding
- National Natural Science Foundation of China [61264004]
- Special Fund for the Twelfth Five Year Major Sci-Tech Program of Education Department in Guizhou Province of China [003]
- High-level Creative Talent Training Program in Guizhou Province of China
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Polyanion-type LiVPO4F has been regarded as a potential candidate of cathode material for lithium-ion batteries due to its high working voltage, excellent thermal stability and good safety. However, the pure LiVPO4F has a low electronic conductivity of 10(-11)S cm(-1), which greatly limits its application in high-power density batteries. In this research, the core-shell carbon-coated LiVPO4F composite is prepared using a facile sol-gel method followed by a solid-state reaction. Owing to the synergistic effects rendered by the LiVPO4F nanoparticles and conductive carbon coating, the as-prepared composite exhibits high reversible capacity (147.9 mAh g-1 at 0.1 degrees C), excellent rate capability (121.2 mAh g(-1) at 5 degrees C) and stable cyclic performance (94% capacity retention after 200 cycles at 2 degrees C). These results reveal that the carbon-coated LiVPO4F material is a promising cathode material for high-power lithium-ion batteries.
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