Unveiling the Role of Secondary Interactions in Indigo Derivatives for Advanced Lithium-Organic Batteries
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초록
내용
Lithium-ion batteries (LIBs) are essential in today’s digital society, but the environmental impact of inorganic materials limits their application. Redox-active small organic materials are promising alternatives for next-generation rechargeable batteries, but they dissolve easily in organic electrolytes, reducing battery performance. To address this, we explored the relationship between solubility of charged species and secondary interactions by inducing persistent secondary interactions throughout the redox reaction. Inspired by indigo, we developed two derivatives that eliminate H-bonds or induce dipolar ionic interactions through S atoms. Sulfur-induced interactions marginally reduced solubility in the neutral state and significantly lowered it in the charged state. This suppression of solubility improved battery performance, showing high cycle stability and retaining over 88% capacity at fast charging speeds.