Characteristics of ternary cathode of lithium-ion power battery at low temperature

doi:10.19799/j.cnki.2095-4239.2023.0608

Abstract

Abstract:

The low-temperature discharge performance of lithium-ion power battery affects the promotion and application of electric vehicles (EVs) in cold regions. The characteristic performances of the cathode have a major influence on the low-temperature performances of lithium-ion batteries; therefore, it is crucial to systematically understand the low-temperature characteristics of the cathode. Herein, the charge and discharge test experiments of commercial ternary lithium-ion power batteries are performed at 25 ℃, 0 ℃, -10 ℃ and -35 ℃. Furthermore, the characteristics of the ternary cathode system are revealed by studying the performance evolution of battery, cathode, and ternary material at different low temperatures. The experimental results reveal that the low temperature has a considerable effect on the discharge capacity and internal resistance of the batteries. At low temperatures, the polarization internal resistance increases faster than the ohmic resistance. With the decrease in testing temperature, the ternary cathodes show the characteristics of decreasing surface density, decreasing conductivity, increasing carbon content, shrinking of cells, loss of activity, and particle cracking. These changes in ternary cathodes hinder the migration of electrons and lithium ions, cause the deterioration of electrochemical kinetic parameters and lead to the attenuation of electrochemical performance. Thus, this study reveals the low-temperature characteristics of ternary cathode, which will help technicians in developing high-performance low-temperature power batteries and improve the promotion of EVs in cold regions.

Key words: power battery, lithium-ion battery, ternary cathode, low-temperature characteristics

CLC Number:

TM 912.9

Hongyi LIANG, Feng CHEN, Youyi GAN, Dan SHAO. Characteristics of ternary cathode of lithium-ion power battery at low temperature[J]. Energy Storage Science and Technology, 2024, 13(1): 293-298.

Figures/Tables 4

References 17

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