Solid-state electrochemistry of organic battery materials : addressing the redox potential and solubility of quinone derivatives
(2020)
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- In the past decades of human development, the Li-ion battery has established itself as a key technology to manage the storage and consumption of electrical energy, and even more so in the present context of a clean energy transition. Organic electrode materials, which offer the possibility of reduced environmental costs when considering production and recycling of Li-ion cells, constitute an alternative to commercial inorganic compounds. Since the late 2000’s, the search for viable and practical organic Li-ion positive electrode materials has witnessed a particular increase in interest. This thesis tackles the complex challenge to design organic molecules displaying a high energy density while remaining insoluble in battery electrolytes. Benzoquinone was chosen as starting material, for it presents interesting redox properties – notably a reversible two-electron redox reaction and a particularly high gravimetric capacity – and can undergo facile molecular modifications. In the first part of this thesis, we developed a new design paradigm based on intermolecular H-bonding to achieve insolubility of organic redox molecules in aprotic electrolytes. In a second phase, we developed a novel organic electrode material meeting all the critical prerequisites of Li-ion battery positive electrodes, while giving insight on a complex electrostatic effect leading to an important gain in redox potential. Finally, we present the preliminary exploration of a new organic redox chemistry based on the N-Li bond, with the perspective of developing new high-energy organic electrode materials.
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Sieuw, L. (2020). Solid-state electrochemistry of organic battery materials : addressing the redox potential and solubility of quinone derivatives. https://hdl.handle.net/2078.5/114938