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Integration of Flexible Batteries
Published in Ye Zhang, Lie Wang, Yang Zhao, Huisheng Peng, Flexible Batteries, 2022
Ye Zhang, Lie Wang, Yang Zhao, Huisheng Peng
Based on a similar strategy, an integrated dye-sensitized solar cell and lithium-oxygen battery is also developed by using a redox-coupled dye-sensitized photoelectrode [7]. In a typical nonaqueous rechargeable lithium-oxygen battery, lithium peroxide was formed on the oxygen electrode surface during the discharging process. However, it is challenging to be electrochemically decomposed due to the bulk and insulating property, which leads to a severe charging overpotential issue, e.g., low energy efficiency [8]. The redox shuttle-coupled photoelectrode with the oxygen electrode in the integrated battery system can enable a photo-charging process. During this process, the reduced form of the redox shuttle Mred was first photoelectrochemically oxidated to Mox, which subsequently diffused to the oxygen electrode and oxidized the solid lithium peroxide (Figure 10.2a). The charging voltage of the battery equaled the energy difference between the redox potential of the Li+/Li couple and the quasi-Fermi level of electrons in the TiO2 photoelectrode, which is close to the conduction band of TiO2 (Figure 10.2b). By efficiently shuttling charges, the redox shuttle improved lithium peroxide oxidation and reduced the charging overpotential.
Oxidative decomposition mechanisms of lithium peroxide clusters: an Ab Initio study
Published in Molecular Physics, 2019
Rajeev S. Assary, Larry A. Curtiss
The exact morphology of lithium peroxide and the nature of the lithium peroxide–solvent interphase formed during the discharge of Li-O2 batteries is largely unknown [28,29,33]. Therefore, accurate modelling using density functional theory for oxidative decomposition of the discharge product is difficult. One way of approximating the oxidative decomposition of the surface sites is to calculate the oxidative process using a molecular model based on clusters, which can mimic a local site of the likely discharge product, lithium peroxide. For instance, for the oxidative decomposition of lithium peroxide, the use of a cluster model offers the advantage of computational simplicity by breaking down the process into three parts: oxidation, lithium ion removal (to the solvent, for example, TEGDME), and O2 evolution as shown in Scheme 1. In this contribution, we present a detailed molecular level investigation of oxidative decomposition of lithium peroxide clusters to provide insight into the charging process of a Li-O2 battery.