A Honeycomb‐Structured CoF₂‐Modified Separator Enabling High‐Performance Lithium−Sulfur Batteries

Sulfur cathode materials in lithium–sulfur chemistry suffer from poor electronic conductivity and shuttle of lithium polysulfides during charging discharging. Serious effects the sluggish redox reaction kinetics severely limit development batteries with high sulfur loading, impeding practical process batteries. Herein, a honeycomb73x02010;structured CoF2@C is introduced as functional layer adhered to separator, achieving rapid lithium-ion transport, catalytic activity, suppressed effect simultaneously. As result, cell CoF2-modified separator presents satisfactory cycle stability capacity decay 0.076% per within 300 cycles at 1 C rate loading 2.0 mg cm−2. A low-capacity 0.088% for 200 0.2 also achieved 3.0 In addition, high-capacity retention 697.5 mA g−1 4.0 cm−2 electrolyte volume/sulfur mass (E/S) ratio 8 μL mg−1.