The development of organic cathodes for lithium-ion batteries has attracted great attention due to their high natural abundance, and relatively low toxicity. However, many of these materials still have low capacity and insufficient cycle stability due to their design and redox instability. To overcome these issues, novel frameworks and small molecules with redox units at the vertices and connection points have been designed, synthesized, and tested. Such a design increases the theoretical capacity of the material due to multiple electrons being accepted per repeat unit. It also imparts high stability, since the material is rigid and highly insoluble in the electrolyte. Lithium-ion batteries consisting of the framework and the small molecule have an excellent cycling retention of 75% and 77%, respectively, over 500 cycles at 1 C. Our work emphasizes the advantages of using multiple redox units in the design of the cathodic materials and the development of linkages that utilize triptycene to achieve high cycling stability

Stable, dual redox unit organic cathodes

2019 Fall National Meeting

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