Study on low-temperature cycle failure mechanism of a ternary lithium ion battery

This study is focused on the changes in parameters such as discharge capacity, and the possible failure mechanism of a 25 Ah ternary lithium ion battery during cycling at -10 degrees C. A new battery and a battery after 500 cycles were disassembled. The morphology and structure of the cathode and anode electrodes were characterized. Transmission electron microscopy (TEM) and X-ray photoelectron absorption spectroscopy (XPS) were used to analyze the changes in the microstructure and chemical environment of the anode electrode interface. The results show that after 500 cycles at -10 degrees C, the capacity of the battery is only 18.3 Ah, and there is a large irreversible capacity loss. The battery samples after low-temperature cycling produced gas during storage at 25 degrees C. It is found that a large amount of lithium plating on the anode surface is an important factor for the reduction in battery capacity. The dissolution of transition metal elements in the cathode electrode and deposition on the anode electrode, and the catalytic decomposition of electrolyte at the anode interface are the main reasons for the gassing of the battery.

Automated summary

This study investigates the changes in parameters such as discharge capacity and the possible failure mechanism of a 25 Ah ternary lithium ion battery during cycling at -10 degrees C. The results show that after 500 cycles at -10 degrees C, the battery capacity decreases significantly with a large irreversible capacity loss. The plating of lithium on the anode surface and the dissolution of transition metal elements in the cathode electrode are identified as important factors contributing to the reduction in battery capacity. Additionally, gas generation in the battery is attributed to the deposition of transition metal elements on the anode electrode and the catalytic decomposition of electrolyte at the anode interface.