Layered Na2RuO3 as a cathode material for Na-ion batteries

• Published in: Electrochemistry communications Vol. 33; pp. 23 - 26
• Main Authors: Tamaru, Mao, Wang, Xianfen, Okubo, Masashi, Yamada, Atsuo
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.08.2013; Amsterdam Elsevier; New York, NY
• Subjects: Applied sciences; Cathode materials; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemistry; Exact sciences and technology; Ruthenium oxide; Sodium-ion batteries; Electrochemistry; Ruthenium oxide; Cathode materials; Sodium-ion batteries; Ternary compound; Scanning electron microscopy; Cycling; Sodium-ion battery; Cathode; Secondary cell; Electrode material; X ray diffraction; Discharge charge cycle; Powder; Ruthenium Oxides; Surface structure; Lamellar structure; Morphology; Current efficiency; Sodium Oxides; Electrical characteristic
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2013.04.011

Na-ion batteries have attracted much interest recently due to strong industrial demands for inexpensive and efficient energy storage. Although layered NaxMO2 (0<x<1, M: transition metal) is the subject of intense studies as cathode materials for the Na-ion batteries, the electrochemical properties of layered Na2MO3 have not been clarified to date. The present work demonstrates that Na2RuO3 can show reversible Na-ion insertion/extraction leading to the specific capacity of 140mAhg−1 at the average potential of 2.8V vs. Na/Na+. Both the capacity retention and Coulombic efficiency are kept at almost 100% during 20cycles, which suggests high reversibility of the electrochemical reaction. Due to the fast Na-ion diffusion and metallic conduction, Na2RuO3 can show the excellent rate capability, where 53% of the maximum discharge capacity is retained even at a high discharge rate of 5C. [Display omitted] •We report Na2RuO3 as a cathode material for Na-ion batteries.•Na2RuO3 delivers 140mAhg−1 at the average potential of 2.8V vs. Na/Na+.•Na2RuO3 shows excellent rate capability leading to 53% capacity retention at 5C.