Studies on ultrasonic appearance of trace water contamination in lithium-ion battery electrolyte

doi:10.19799/j.cnki.2095-4239.2022.0599

Abstract

Abstract:

Trace water contamination in the electrolyte is an important cause for gassing and rapid failure of lithium-ion batteries. However, there is lack of nondestructive techniques to detect trace water in cells. In this study, based on the sensitivity of ultrasonic nondestructive imaging technique to trace gassing side reactions, ultrasonic transmission scanning imaging was performed to analyze the gassing behavior of commercial NCM523/AG pouch cells with different water contents during formation, storing, and cycling. Using electrochemical impedance spectroscopy, scanning electronic microscopy, and charge/discharge characterization, the aging and failure mechanisms were analyzed. The results show that the presence of trace water causes consumption of electrolyte, accelerates gas generation, and increases interfacial impedance and polarization voltage. These characteristics can further cause the reduction of coulomb efficiency and capacity decay, thus accelerating battery failure. This study has guiding significance for quality control in the battery production process and failure mechanism analysis during battery usage.

Key words: ultrasonic nondestructive imaging, trace water, lithium-ion battery

CLC Number:

TK 02

Hong XIE, Kai HUANG, Jinqiao DU, Yan HAN, Yue SHEN. Studies on ultrasonic appearance of trace water contamination in lithium-ion battery electrolyte[J]. Energy Storage Science and Technology, 2022, 11(12): 4030-4037.

Figures/Tables 10

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References 14

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