"Dragging effect" induced fast desolvation kinetics and-50 C workable high-safe lithium batteries
ENERGY STORAGE MATERIALS(2024)
Abstract
Propylene carbonate (PC) was once considered as the most suitable alternative to ethylene carbonate (EC) due to its high ionic conductivity and low melting point (-49 degrees C), whereas it shows a poor electrochemical compatibility with graphite anodes. Although designing an anion-induced ion-solvent-coordinated (AI-ISC) structure could effectively restrain the decomposition of PC on anodes, the strong interaction of Li+-PC leads to sluggish Li+ desolvation process as well as unsatisfactory low temperature performance. Here, we discovered and disclosed the mechanism of the "dragging effect" between Li+-solvent and anion-solvent, and exquisitely design a self-adapting double-layer solvation structure where free solvents outside the primary solvation sheath could effectively weaken the interactions between Li+-PC and Li+- PF6-. The rational designed LiPF6-PC/TFEP/EMC electrolyte exhibits fast desolvation kinetics and low-temperature adaptability, therefore endowing 4Ah Gr|| LiNi0.8Mn0.1Co0.1O2 and 1Ah Gr||LiFePO4 pouch cells with-50 degrees C workability, long cycle life and enhanced safety. It is believed that the regulation of "dragging effect" induced self-adapting double-layer solvation structure will eventually pave the way for developing cost-effectiveness, flame-retardant, and low-temperature workable electrolytes towards all-climate and safer lithium-ion battery applications.
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Key words
PC-based electrolyte,Fast desolvation kinetics,Flame-retardant,Low-temperature,Lithium-ion batteries
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