Design and research of all-ether high-entropy electrolyte for low-temperature lithium iron phosphate batteries

doi:10.19799/j.cnki.2095-4239.2024.0338

Abstract

Abstract:

Lithium iron phosphate (LFP) materials are known for their outstanding cycle stability and energy density at room temperature (RT, 25 ℃); however, their performance at low temperatures (LT, -20 ℃) is hindered owing to poor ionic conductivity and sluggish kinetics. This study introduces a novel all-ether high-entropy electrolyte, formulated by integrating ethers of varying solvating powers, to enhance the electrochemical performance of LFP batteries at LT. Experimental results confirm that this approach considerably enhances the ionic conductivity and kinetic stability of the electrolyte at LT, thereby substantially improving the low-temperature discharge capacity and cycle lifespan of LFP batteries. The mix-7 electrolyte variant, in particular, demonstrates exceptional charge-discharge stability at LT. After 150 cycles, it retains a high capacity retention rate of 99.7% and maintains 81.1% of its initial capacity at RT. This strategy proves effective and versatile, markedly enhancing the low-temperature performance and broadening the application spectrum of LFP batteries.

Key words: lithium-ion batteries, lithium iron phosphate cathode, low-temperature performance, ether solvents, high-entropy electrolyte

CLC Number:

TM 911

Meilong WANG, Yurui XUE, Wenxi HU, Keyu DU, Ruitao SUN, Bin ZHANG, Ya YOU. Design and research of all-ether high-entropy electrolyte for low-temperature lithium iron phosphate batteries[J]. Energy Storage Science and Technology, 2024, 13(7): 2131-2140.

Figures/Tables 5

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