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- W3106354369 abstract "In recent years, there has been increasing interest in developing high capacity Na intercalation batteries1-3, mainly because of their similar chemical behavior as Li-ion batteries, low cost of raw materials and abundance of sodium in the earth's crust. A material of interest for Na-ion batteries is Na2CuO2 with a high theoretical capacity (379 mAh/g and 189 mAh/g, corresponding to 2 and 1 Na ions intercalated). Na2CuO2 has been hypothesized to exist, analogous to the already reported lithium cuprate4 (Li2CuO2); however, it has never been reported. In this work, the NaCuO2 phase is first synthesized through a solid state reaction, with the aim of carrying out further in-situ electrochemical modifications to obtain the Na2CuO2 phase. Preliminary results have shown reversible electrochemical properties of the NaCuO2 phase, upon electrochemical reduction the Na1+xCu3-xO2 (0<xβ€1) phase is most likely formed around 1.5 V (vs Na0/Na+ ), Figure 1. A. During galvanostatic cycling, in a voltage window of 1.5-4 V, reversible capacities of 15 mAh/g are achieved, Figure 1. B; however, in a wider potential range (0.7 V to 4.2 V) the first charge cycle reaches capacities of 120 mAh/g, unfortunately fading in subsequent cycles. The capacity fade is partly attributed to the presence of impurities formed during the synthesis of the NaCuO2 phase (primarily CuO and NaOH). Several strategies are carried out to increase the purity of NaCuO2, for instance, improving reactant contact and determining the ideal reaction temperature; on the other hand, further structural characterization is performed to determine the species formed during the reduction of NaCuO2 (e.g. XRD in-situ). This project has been performed with the financial support from Conacyt PN2016 Project 2551 and SECITI SECITI/080/2017 and C. Juarez-Yescas acknowledges the Postgraduate grant from Conacyt. Figure 1. A) typical voltammograms (v=0.01 mV/s) and B) charge β discharge curves obtained for ππ0 | 1π ππππΉ6 (πΈπΆ:π·πΆ) | πππΆπ’π2:πΆππ:πππ·πΉ. The charge β discharge curves were obtained at 0.1 C. References Vaalma, C., Buchholz, D., Weil, M. & Passerini, S. Nat. Rev. Mater. 3, (2018). Kim, H., Kim, H., Ding, Z., Lee, M. H. & Lim, K. Adv. Energy Mater. 1β38 (2016). Hwang, J.-Y., Myung, S.-T. & Sun, Y.-K. Chem. Soc. Rev. 46, 3529β3614 (2017). G. Ramos-Sanchez, I. Romero-Ibarra, J. Vazquez-Arenas, C. Tapia, N. Aguilar-Eseiza, I. Gonzalez,. Solid State Ionics 303, 89β96 (2017). Figure 1" @default.
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- W3106354369 date "2019-01-01" @default.
- W3106354369 modified "2023-09-27" @default.
- W3106354369 title "In-Situ Electrochemical Formation of Na1+XCu3-XO2 for Cathodes in Sodium Ion Batteries." @default.
- W3106354369 doi "https://doi.org/10.1149/ma2019-01/2/116" @default.
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