期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 23, 页码 18826-18834出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03584
关键词
fluorophosphate; pyro synthesis; cathodes; carbon coating; sodium ion batteries
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2017R1A2A1A17069397, NRF-2018R1A5A1025224]
- National Research Council of Science & Technology (NST), Republic of Korea [KIER4-2, KIER4-2-4] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A uniform carbon-coated Na3V2(PO4)(2)O2xF3-2x (NVPOF/C) nano-particle synthesized by a novel pyro synthesis method is utilized for sodium-ion batteries (SIBs) as a cathode. Remarkably, the electrochemical properties are performed at high rates show significantly improved discharge capacity. At 0.1 degrees C, the NVPOF/C cathode shows a discharge capacity of 130 mAh g(-1), corresponding to 100% of the theoretical capacity. Even at 50 degrees C, a discharge capacity of similar to 85 mAh g(-1) could be attained. The in situ X-ray diffraction and ex-situ synchrotron X-ray absorption near edge structure spectroscopy results exposed that the reversible sodium ion insertion/extraction into/from NVPOF/C host structure occurs with a small volume change (3.4%), indicating the structural stability of the cathode. Our study validates that the Na3V2(PO4)(2)O2xF3-2x/C electrode is a promising candidate for developing high power/energy density cathodes for SIBs.
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