What is the negative electrode material of ternary lithium batteries?
3 Answers
TernThe negative electrode of a ternary lithium battery is made of graphite, which has a layered structure that can accommodate lithium atoms. Here is some relevant information about ternary lithium batteries: 1. The positive electrode is made of ternary materials. Ternary materials refer to three materials, which are nickel, cobalt, and manganese. Some ternary lithium batteries also use nickel, cobalt, and aluminum to make the positive electrode. 2. Ternary lithium batteries are currently quite popular, and most pure electric vehicles use ternary lithium batteries. Lithium batteries are lighter in weight and have higher energy density, making them very suitable for use in pure electric vehicles.
Previously worked on many EV battery packs, the negative electrodes of ternary lithium batteries are mostly made of graphite material. The layered structure of graphite can intercalate lithium ions, which embed during charging and exit during discharging. However, prolonged use of the negative electrode can lead to lithium dendrite formation, which is dangerous if it pierces the separator. Therefore, the battery management system is particularly crucial, strictly controlling the upper charging voltage limit. For car enthusiasts looking to increase capacity, never replace the negative electrode material on your own—the compatibility between graphite and ternary cathode materials has been validated through countless experiments.
As an EV owner who frequently drives long distances, I've specifically researched battery construction. Ternary lithium batteries commonly use modified graphite for the anode, with surface treatments to enhance stability. I remember one time after fast charging in cold winter temperatures, the battery drained quickly, and the technician said it was due to anode polarization causing difficulty in lithium-ion intercalation. The newer models now use silicon-carbon composite materials, which theoretically have ten times the capacity of graphite, but the expansion issue hasn't been completely resolved yet. For daily use, it's recommended to avoid deep discharges - maintaining the charge between 20%-80% is most protective for the anode material.
