Toward a Four‐Electron Redox Quinone Polymer for High Capacity Lithium Ion Storage |
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Authors: | Aaron Petronico Kimberly L Bassett Bruno G Nicolau Andrew A Gewirth Ralph G Nuzzo |
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Institution: | Department of Chemistry, University of Illinois at Urbana Champaign, Urbana, IL, USA |
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Abstract: | Despite recent advances, current polymeric organic cathode materials have failed to incorporate a high degree of lithium storage in a small molecular framework, resulting in low capacities relative to monomers. This report discloses the development of a lithium salt polymer of dihydroxyanthraquinone (LiDHAQS) capable of storing four Li+ per monomer. The combination of storing four Li+ per monomer and a low molecular weight monomer results in a capacity of 330 mA h g?1, a record for this class of material. The additional redox events responsible for added Li+ storage occur between 3.0 and 3.6 V versus Li/Li+ resulting in an average discharge potential of 2.5 V versus Li/Li+. These metrics combined yield a high energy density of 825 W h kg?1 which is a 55% improvement over commercial lithium cobalt oxide. The high performance of LiDHAQS makes it a promising material for next generation Li+ cathodes. |
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Keywords: | batteries cathodes lithium polymer quinone |
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