Nonaqueous Organic Slurry Battery over 4 V

The development of high-voltage batteries is increasingly desirable because they offer higher energy density than conventional batteries, allowing for greater energy storage over extended periods. Herein, we developed a high-voltage nonaqueous, all-organic slurry battery utilizing molecularly engineered tetrathiafulvalene (TTF) derivatives as redox-active cathode materials. Both perF-TTF and CN4-TTF exhibit two reversible one-electron redox activities. The high insolubilities of perF-TTF and CN4-TTF in aqueous and nonaqueous electrolyte solutions make them suitable candidates for the development of slurry batteries. The Li||perF-TTF (0.5 M) slurry battery exhibited higher performance, showing Coulombic, voltage, and energy efficiencies of 95%, 83%, and 79%, respectively, and capacity retention of 76% over 100 charge/discharge cycles. The Li||perF-TTF (0.5 M) slurry battery demonstrated an energy density of ∼94 Wh/L and a maximum power density of 251 mW/cm2. These findings highlight the potential of slurry batteries for further advancements in battery technology.