Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 24, Pages 15341-15351Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03410
Keywords
sodium ion batteries; cathode; Na3V2(PO4)(3); carbon nanotubes; doping
Funding
- National Nature Science Foundation of China [21336003, 21371021, 21543015]
- Program for New Century Excellent Talents in University of China [NCET-12-0758]
- Science and Technology Commission of Shanghai Municipality [14DZ2261000]
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An advanced cathode material, nitrogen-doped carbon-coated Na3V2(PO4)(3) hybriding with multiwalled carbon nanotubes (CNTs) composite, namely double-nanocarbon synergistically modified Na3V2(PO4)(3) of sodium ion battery, was fabricated through a simple sol gel approach. According to the systemical analysis of experimental results on this composite structure, it is found that N-doping not only increases Na-ion migration velocity across the carbon-coated layer but also improves the electric conductivity of the carbon layer. More importantly, the CNTs 3D conducting network could significantly accelerate the electron transport between multiple particles of Na3V2(PO4)(3), due to the intimate contacts between active materials and CNTs. Consenquently, the electrochemical properties of this double-nanocarbon-modified Na3V2(PO4)(3) are significantly enhanced, especially the high-rate capability and long cycle life. For instance, its initial capacity of 94.5 mAh g(-1) at 0.2 C decreases to 70 mAh g(-1) at 70 C, and the capacity retention is 74%. Moreover, when dischage rate increases to a higher 30 C, the capacity retention is still as high as 87% after 300 cycles.
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