Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 46, Pages 31709-31715Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11372
Keywords
Na3V2(PO4)(2)F-3; ordered mesoporous carbon; nanocrystal; superior high rate; ultralong cycle life
Funding
- 973 project [2015CB251103]
- NSFC [51472104, 51572107]
- development program of science and technology of Jilin Province [20150312002ZG]
- graduate innovation fund of Jilin University [2016062]
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NASICON-structured Na3V2(PO4)(2)F-3 is considered as a potentially high-capacity cathode material for Na-ion batteries; however, its poor rate capability and insufficient cyclability remain a challenge for battery applications. To address this issue, we designed and successfully synthesized a core/double-shell structured Na3V2(PO4)(2)F-3@C nanocomposite (Na3V2(PO4)(2)F-3@C-D) by in situ carbon coating and embedding the Na3V2(PO4)(2)F-3 nanoparticles in ordered mesoporous carbon framework. Benefiting from the sufficient electrochemically available interfaces and abundant electronic/ionic pathways, this Na3V2(PO4)(2)F-3@C-D material demonstrated superior Na+-storage performance with a high reversible capacity of 120 mA h g(-1) at a moderate current of 1 C, a strong high-rate capability with 63 mA h g(-1) at an extremely high rate of 100 C, and a long-cycle lifespan with 65% capacity retention over 5000 cycles. These superior electrochemical performances remained stable when the Na3V2(PO4)(2)F-3@C-D cathode was used in a full cell, suggesting a promising application of the material for high rate and long lifespan sodium-ion batteries. Moreover, the architectural design and synthetic method developed in this work may provide a new avenue to create high performance Na+-host materials for a wide range of electric energy storage applications.
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