Enhanced Performance of Sn4P3 Electrode Cycled in Ionic Liquid Electrolyte at Intermediate Temperature as Na‐Ion Battery Anode. Issue 29 (1st August 2018)

• Record Type: Journal Article
• Authors: Usui, Hiroyuki; Domi, Yasuhiro; Nishida, Haruka; Yamaguchi, Kazuki; Yamagami, Ryota; Sakaguchi, Hiroki
• Is Part Of: ChemistrySelect. Volume 3:Issue 29(2018)
• Page Start: 8462
• Page End: 8467
• Publication Date: 2018-08-01
• Subjects: Na-ion battery -- Anode materials -- Tin phosphide (Sn4P3) -- Ionic liquid electrolyte -- Intermediate temperature; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201801517
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Charge−discharge performances of Sn4 P3 anodes for Na‐ion battery were evaluated in an ionic liquid electrolyte using N ‐methyl‐ N ‐propylpyrrolidinium bis(fluorosulfonyl)amide at intermediate temperatures of 60 and 90 o C. At these temperatures, the anode showed extra capacities based on the full sodiation of Sn in a potential range below 0.2 V vs. Na + /Na because its slow kinetics was improved by elevating operation temperature. Under the current density of 0.1 A g −1 (0.08 C ), the Sn4 P3 anode at 60 o C exhibited a large capacity of 750 mA h g −1 at the 120th cycle and high Coulombic efficiencies above 99% after the 5th cycle. On the other hand, the efficiency degraded at 90 o C by the electrolyte decomposition. At 60 o C, the anode attained an excellent rate performance with capacity of 250 mA h g −1 even at 3 A g −1 (2.65 C ). These results demonstrated the promising operation at intermediate temperature at around 60 o C for Sn4 P3 anode in ionic liquid electrolyte. Abstract : Sn4 P3 anodes were cycled in an ionic liquid electrolyte at intermediate temperatures for Na‐ion battery. At 60 o C, the anode exhibited extra capacities and further enhanced performance. One of the reasons is the improved kinetics in the full sodiation reaction of Sn.