Na2 + 2xFe2-x (SO4)3@rice husks carbon composite as a high-performance cathode material for sodium-ion batteries
- 56 Downloads
Na2 + 2xFe2-x (SO4)3 (NFS) holds great promise as the cathode material for room-temperature sodium-ion batteries. However, large-scale application of NFS is highly impeded by its low electrical conductivity, which leads to poor cyclability and rate capability. To address these issues, we introduce rice husk-derived carbon with engineered porosity and structure as carrier to load active material NFS. The resultant hybrid material delivers extremely high specific charge capacity of 113.4 mAh g−1 at 0.1 C (1 C = 120 mA g−1), and a large reversible capacity of 81.2 mAh g−1 is retained after 100 cycles with a high retention rate of about 83.9%. The capacity of the composite can reach 60 mAh g−1 even at the current density 5 C. These excellent electrochemical performances are attributed to a favorable combination of the interpenetrating conductive carbon framework and ordered mesoporous structure that maintain well-balanced ionic and electronic conductivities throughout the electrode.
KeywordsSodium-ion batteries Na2 + 2xFe2-x (SO4)3 Rice husk carbon Cathode
This work was supported by funding from “973” project (No. 2015CB251103), National Natural Science Foundation of China (No. 21771086), S&T Development Program of Jilin Province (Nos. 20160101320JC, 20180101293JC), and Jilin Provincial Department of Education “13th Five-Year” scientific research project (No. JJKH20180116KJ).
- 23.Oyama G, Nishimura SI, Suzuki Y, Okubo M, Yamada A (2015) Off-stoichiometry in alluaudite-type sodium iron sulfate Na2+2xFe2−x(SO4)3 as an advanced sodium battery cathode material. Chem Electro Chem 2:1019–1023Google Scholar
- 25.Lu JC, Yamada A (2016) Ionic and electronic transport in alluaudite Na2+2xFe2-x(SO4)3. Chem Electro Chem 3:902–905Google Scholar
- 28.Liu Q, Wang DX, Yang X, Chen N, Wang CZ, Bie XF, Wei YJ, Chen G, Du F (2015) Carbon-coated Na3V2(PO4)2F3 nanoparticles embedded in a mesoporous carbon matrix as a potential cathode material for sodium-ion batteries with superior rate capability and long-term cycle life. J Mater Chem A 3:21478–21485CrossRefGoogle Scholar
- 42.Wei SH, Benoit MDB, Oyama G, Nishimura S-I, Yamada A (2016) Synthesis and electrochemistry of Na2.5(Fe1−yMny)1.75(SO4)3solid solutions for Na-ion batteries. Chem Electro Chem 3:209–213Google Scholar