High-donor electrolyte endows graphite with anion-derived interphase to achieve stable K-storage
نویسندگان
چکیده
Graphite anodes are expected to be applied in potassium-ion batteries, but it is limited by uncontrolled volume fluctuation and dendrite growth during cycles. Herein, an anion-derived interphase with high mechanical strength ionic conductivity constructed address the aforementioned issues using amide-based electrolyte. The high-donor number for amide molecule can strengthen solvation K+, ensuring more anions enter primary sheath. shortened distance favor of electron transfer from solvated K+ anion subsequently motivates reduction. obtained inorganic-rich buffers change, suppresses K propagation, facilitates ion diffusion. Based on these, symmetric K//K cells could operate stable plating stripping a small polarization 0.15 V over 2800 h. graphite electrode achieves highly reversible phase transition C↔KC60↔KC48↔KC36↔KC24↔KC8. A discharge capacity 217.6 mA h g−1 retention 86.9% after 100 assembled full battery also exhibits energy density 52.5 W kg−1. This work highlights importance interfacial structure provides brand-new strategy designing high-performance electrolytes.
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ژورنال
عنوان ژورنال: Science China. Materials
سال: 2022
ISSN: ['2095-8226', '2199-4501']
DOI: https://doi.org/10.1007/s40843-022-2265-4