Carbonates (bicarbonates)/reduced graphene oxide as anode materials for sodium-ion batteries. Issue 47 (27th November 2017)

• Record Type: Journal Article
• Authors: Gu, Xin; Yan, Chunliu; Yan, Liting; Cao, Lei; Niu, Feier; Liu, Dandan; Dai, Pengcheng; Li, Liangjun; Yang, Jian; Zhao, Xuebo
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 47(2017)
• Page Start: 24645
• Page End: 24650
• Publication Date: 2017-11-27
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta08532j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Carbonates/bicarbonates (FeCO3, CoCO3 and Ni(HCO3 )2 ), as promising anode materials, are evaluated for sodium-ion batteries for the first time. Abstract : Carbonates/bicarbonates (FeCO3, CoCO3 and Ni(HCO3 )2 ) supported on reduced graphene oxide (rGO) are prepared by a simple method and examined as anode materials for sodium-ion batteries for the first time. Although carbonates in the composite are of the order of micrometers, they show fair electrochemical activities, particularly for FeCO3 /rGO. It delivers a capacity of 247 mA h g −1 after 500 cycles at 500 mA g −1, corresponding to a capacity retention of 87% relative to the capacity at the second cycle. It also shows a superior rate capability with a capacity of 176 mA h g −1 at 2 A g −1 . Ex situ XPS spectra, HRTEM images and SAED patterns demonstrate that the sodium uptake/extraction in FeCO3, CoCO3 and Ni(HCO3 )2 is via M 0 /M 2+ -engaged redox reaction.