A novel redox-active quinone-based organic building block 1,4-dicyano-2,3,5,6-tetrahydroxybenzene (LH4) has been synthesized and used as a bridging ligand to form a new 1D copper-benzoquinoid coordination polymer [CuL(DMF)2]n. The compound is able to deliver an initial capacity as high as 268 mA h g-1 at 30 mA g-1 (∼C/2.5) when used as the cathode in Li batteries. Ex situ XPS and FT-IR reveal the involvement of both Cu and organic moieties in the multi-electron redox reaction. Cu K-edge XANES and EXAFS measurements confirm the change in the oxidation state and coordination environment of Cu during the discharge-charge process. In situ generated metallic nanoparticles have been observed by TEM. The obtained mechanistic understanding of the metal-organic electrode materials for Li-based batteries may pave the way for the design of next-generation energy-storage systems.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)