Carbon coated Na7Fe7(PO4)6F3: A novel intercalation cathode for sodium-ion batteries
Data(s) |
20/12/2014
|
---|---|
Resumo |
Electrode materials are being developed to realise sodium-ion batteries that can provide energy storage solutions. Here, we develop amorphous carbon coated Na<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>3</sub>, prepared by combining hydrothermal and solid state reaction methods, as an insertion electrode for sodium-ion batteries applications. Na<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>3</sub> particles are surrounded by a thin layer (∼1.5–2 nm) of amorphous carbon. The Na<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>3</sub>/C composite cathode undergoes reversible sodium intercalation/de-intercalation with an average operational potential of ∼3.0 V (vs Na<sup>+</sup>/Na). This cathode has a capacity of 65 mA h g<sup>−1</sup> at 100 mA g<sup>−1</sup> current after 60 cycles and features twice higher capacity than that of an uncoated Na<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>3</sub> sample. Therefore, the carbon-coated Na<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>3</sub> composite presents feasible sodium intercalation/de-intercalation capacity, offering possibilities for developing a low cost, high performance sodium-ion battery positive electrode. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Elsevier |
Relação |
DP130102311 http://dro.deakin.edu.au/eserv/DU:30069713/ramireddy-carboncoated-2014.pdf http://www.dx.doi.org/10.1016/j.jbowsour.2014.08.039 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2 |
Direitos |
2014, Elsevier |
Palavras-Chave | #Science & Technology #Physical Sciences #Technology #Electrochemistry #Energy & Fuels #Na7Fe7(PO4)(6)F-3/C composite cathode #Amorphous carbon #Hydrothermal synthesis #Solid state reaction #Sodium-ion battery #SYNCHROTRON X-RAY #ENERGY-STORAGE #LOW-COST #NA #STABILITY #NA2FEPO4F #NA3V2O2X(PO4)(2)F3-2X #DIFFRACTION #COMPOSITE |
Tipo |
Journal Article |