Journal
JOURNAL OF POWER SOURCES
Volume 303, Issue -, Pages 333-339Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.11.015
Keywords
Li3VO4; Expanded graphite; Anode; Lithium ion battery
Funding
- State Key Basic Research Program of PRC [2011CB935903]
- National Natural Science Foundation of China [21333002]
- Shanghai Science Technology Committee [13JC1407900]
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A hierarchical structure of carbon-coated Li3VO4 nanoparticles homogeneously embedded in expanded graphite was successfully synthesized by a facile and scalable sol gel method. In the constructed architecture, high electronic conductivity of expanded graphite serves as a loading carrier, enabling the fast transmission of electronics. The thin outside carbon shells protect the Li3VO4 nanoparticles from direct exposure to the electrolyte and mitigate unwanted interfacial side reactions. As a consequence, the hybrid material exhibits greatly enhanced cycle and rate capability compared with pristine Li3VO4: a reversible gravimetric capacity of 405 mAh g(-1) obtained at 100 mA g(-1) with 89% retention after 200 cycles, and 205.5 mAh g(-1) obtained after 2000 cycles at a heavy current of 2000 mA g(-1), as well as an remarkable rate performance of 62.7% capacity maintaining at 6400 mA g(-1) (vs. 100 mA g(-1)). (C) 2015 Elsevier B.V. All rights reserved.
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