Nonflammable Fluorinated Cyclic Phosphorus-Based Compounds as Co-Solvents for Advanced Lithium Ion Battery Electrolytes

摘要

The utilization of portable energy sources like lithium-ion batteries (LIBs) is of essential worth nowadays. However, there are still certain limitations and bottlenecks addressed to nonaqueous aprotic electrolytes, as inevitable components for the operation of the battery.[1] With this in line, state-of-the-art (SOTA) nonaqueous aprotic electrolytes reveal different challenges such as high flammability. With the advance demand of energy in the last decades an improvement in safety concerns with an improved cycling performance are highly required for the advanced batteries, tailored for targeted application.[2-5] To cope with this challenge, one effective and cost favorable approach refers to the introduction of functional additives or co-solvents to the SOTA electrolyte.[2-3] Phosphorus (III and V) fluorinated or non- fluorinated compounds have been the subject of an investigation and can be featured as effective flame retardants.[2-3] However, a trade-off between flammability and cycling performance is always present, due to the high content of the flame retardant negatively influencing the operation of the battery.[2-3]