Application of impedance analysis in the detection of lithium evolution threshold of lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2022.0716

Abstract

Abstract:

In this paper, the impedance analysis method was used to detect the lithium evolution threshold of lithium-ion batteries at different temperatures and charging rates. Comparison test and analysis with the nondestructive testing method and relaxation voltage analysis method (dV/dt method) were conducted. The impedance value obtained through intermittent sleep during battery charging is taken as the analysis data. The inflection point of impedance decline at the end of charging represents the beginning of the lithium evolution of the battery. The corresponding voltage and state of charge are the lithium evolution threshold of the battery. The results show that the impedance analysis method can realize nondestructive detection of lithium evolution from batteries. The detection results of the method for lithium evolution from batteries are consistent with those of the relaxation voltage analysis method. The impedance analysis method accurately determines whether lithium evolution occurs in batteries and also measures the threshold voltage or the state of charge of the battery at which lithium evolution begins, thus providing a basis for the optimization of the charging system. By using impedance analysis method, this paper further uses this method to detect the lithium evolution threshold voltage of a cylindrical ternary battery and lithium iron phosphate battery. Here, the lithium evolution boundary of the battery in combination with different temperatures and charging rates are analyzed. The results show that lithium evolution easily occurs in the low-temperature environment for lithium iron phosphate and nickel cobalt aluminum ternary batteries, and the threshold of lithium evolution of the battery gradually increases with the increase in temperature. Thus, this improves the phenomenon of lithium precipitation. However, for the nickel-cobalt aluminum ternary battery, lithium begins to separate from the battery, when the rate is increased to 0.6 C at room temperature. Thus, the monitoring and analysis of the battery using the lithium evolution threshold method significantly affects the formulation of subsequent battery charging strategy.

Key words: lithiumion battery, lithium plating threshold, non destructive testing, impedance

CLC Number:

TM 911

Qisong LI, Rong CHEN, Huifang LI. Application of impedance analysis in the detection of lithium evolution threshold of lithium-ion batteries[J]. Energy Storage Science and Technology, 2023, 12(4): 1278-1282.

Figures/Tables 5

Table 1

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