| Battery Performance Analysis of Hollow Double-shelled Sphere VOOH as The Cathode for Aqueous Zinc-Ion Battery Vasant Kumar1; Sarah Alya Firnadya2; 1UNIVERSITY OF CAMBRIDGE, Cambridge, United Kingdom; 2UNIVERSITY OF CAMBRIDGE, New York, United States; PAPER: 470/Battery/Regular (Oral) SCHEDULED: 14:25/Mon. 28 Nov. 2022/Similan 2 ABSTRACT: Aqueous Zn-ion battery has been getting much attention because of the ready availability and low cost of zinc relative to lithium [1]. The battery is also much safer to manufacture, use and dispose as they use water-based electrolyte and non-flammable electrode materials [2]. As a cathode, hollow shelled MOOH (M = V, Fe) has been considered as a good cathode as it produces high capacity, stability, and long-life [3]. In this study, the morphology of the VOOH material has been altered into hollow double shell sphere structure to achieve a stable cathode with high internal surface area[3][4]. The effects on capacity with respect to a single-shelled VOOH will be investigated and analyzed. The double shelled VOOH was prepared using a 2-step hydrothermal process [4] and was made into a slurry to be pasted onto a stainless steel SS304 current collector. The battery was then assembled using current collectors, a metallic anode, a separator soaked with electrolyte and the cathode in a Swagelock Cell for testing. The results showed that the capacity of the cathode was similar to the single-shelled VOOH with a capacity of 479, 426, 414, 374, and 284 mAh g-1, at current densities of 0.01, 0.1, 0.2, 0.5 and 1 A g-1, respectively. Effects of each battery component was also analyzed in this study by using different anodes (Zn and Cu), electrolytes (Zn(CF3SO3)2 (aq, 3M) and ZnSO4 (aq, 2M)), separators (glass fiber and polypropylene), and current collectors SS304, Al, and Cu. An oxidized version of VOOH was also tested as a cathode to analyze the difference between the two cathodes. Structural and morphological characterization methods used in this study were XRD and SEM, and the electrochemical methods deployed were battery performance Charge-discharge cycle tests, Cyclic Voltammetry, and Electrochemical Impedance Spectroscopy. The result showed that the optimal component for the battery were VOOH as the cathode, Zn as the anode, Zn(CF3SO3)2 3M as the electrolyte, glass fiber as the separator and SS 304 as the current collector. References: [1] J. F. Parker et al., “Rechargeable nickel–3D zinc batteries: An energy-dense, safer alternative to lithium-ion,” Science (80-. )., vol. 418, no. April, pp. 415–418, 2017. [2] L. E. Blanc, D. Kundu, and L. F. Nazar, “Scientific Challenges for the Implementation of Zn-Ion Batteries,” Joule, vol. 4, no. 4, pp. 771–799, 2020, doi: 10.1016/j.joule.2020.03.002. [3] L. Wang, K. W. Huang, J. Chen, and J. Zheng, “Ultralong cycle stability of aqueous zinc-ion batteries with zinc vanadium oxide cathodes,” Sci. Adv., vol. 5, no. 10, pp. 1–11, 2019, doi: 10.1126/sciadv.aax4279. [4] C. Wu, X. Zhang, B. Ning, J. Yang, and Y. Xie, “Shape evolution of new-phased lepidocrocite vooh from single-shelled to double-shelled hollow nanospheres on the basis of programmed reaction-temperature strategy,” Inorg. Chem., vol. 48, no. 13, pp. 6044–6054, 2009, doi: 10.1021/ic900416v. |
