期刊
CHEMICAL ENGINEERING JOURNAL
卷 335, 期 -, 页码 301-308出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.10.164
关键词
Sodium-ion battery; Cathode Na3V2(PO4)(3); Nanoflake; Hierarchical structure
资金
- National Natural Science Foundation of China [51374255, 51302323, 51572299]
- Program for New Century Excellent Talents in University [NCET-13-0594]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts109]
Na3V2(PO4)(3) (NVP) is considered as a promising cathode material in Sodium-ion batteries (SIBs). However, the intrinsically poor electronic conductivity greatly limits its electrochemical performances and practical applications. Herein, a solid-state annealing process using a facile surfactant-assisted method has been developed to fabricate a three-dimensional (3D) Na3V2(PO4)(3)/ C (NVP/ C) composite with hierarchical nanoflake-assembled structure. Sodium oleate functions both as sodium and carbon sources. Moreover, it dictates the preferential growth of nanocrystal as a surfactant. This flaky structure coated by carbon can ensure the excellent electrochemical performances of the NVP/C composite, such as high reversible capacity (103.4 mA h g(-1) at 1 degrees C), excellent rate capability (68.3 mA h g(-1) at a rate up to 20 degrees C) and good cycling stability (a capacity retention of 78.2% after 2000 cycles at 10 C).
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