Data–Knowledge-Dual-Driven Electrolyte Design for Fast-Charging Lithium Ion Batteries

Abstract

Electric vehicles starve for minutes-level fast-charging lithium-ion batteries, while the heat gathering at high-rates charging and torridity-condition have detrimental effects on electrolytes, triggering rapid battery degradation and even safety hazards. However, the current research on high-temperature fast-charging (HTFC) electrolytes is very lacking. We revolutionized the conventional paradigm of developing HTFC electrolytes integrating with high-throughput calculation, machine-learning techniques, and experimental verifications to establish a data–knowledge-dual-driven approach. Ethyl trimethylacetate was efficiently screened out based on the approach and enabled batteries to work under high temperatures with distinctly restricted side reactions. A stable and highly safe fast-charging (15-min charging to 80% capacity) cycling without Li plating was achieved over 4100 cycles at 45°C based on 181 Wh kg−1 pouch cells, demonstrating the state-of-art in this field.