What is a ternary lithium battery?

1. Concept:

Ternary polymer lithium battery refers to a lithium battery that uses lithium nickel cobalt manganese ternary cathode material as its cathode material.

There are many kinds of cathode materials for lithium ion batteries, mainly lithium cobalt oxide, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, and so on. At present, ternary material batteries have replaced the previously widely used lithium cobalt oxide batteries and are widely used in the field of notebook batteries. In recent years, ternary lithium batteries have also begun to be used in the neighborhood of electric vehicles.

2. Advantages:

Compared with lithium iron phosphate batteries and lithium manganese oxide batteries, it has high capacity, long life, and light battery weight; materials that are more balanced in terms of capacity and safety have better cycle performance than normal lithium cobalt oxide; due to technical reasons in the early stage, The nominal voltage is only 3.5-3.6V, which is limited in the scope of use. However, with the continuous improvement of the formula and the perfect structure, the nominal voltage of the battery has reached 3.7V, which has reached or exceeded the lithium cobalt oxide battery in capacity. level.

Why Tesla is so fond of ternary lithium batteries:

After Tesla tried more than 300 types of batteries on the market, the reason for choosing ternary lithium batteries was that they had greater energy density and better stability and consistency; they could effectively reduce the cost of the battery system; small size, controllability and safety Sex is constantly improving. (From Kurt Kelty, Director of Tesla Battery Technology)

3. Disadvantages:

The cost is relatively high; when applied to electric vehicles, a very strict battery management system is required. Only a few foreign models such as Tesla are widely used. The neighborhood of electric vehicles in my country is still dominated by lithium iron phosphate batteries, but a few electric vehicle manufacturers also Has gradually begun to apply.

4. Development:

The world’s five major battery cell brands SANYO, PANASONIC, SONY, LG, and SAMSUNG have launched ternary material batteries (it can be seen that the world’s first-class ternary lithium battery technology is concentrated in Japan and South Korea), and a considerable part of the notebook battery line uses ternary Material batteries replaced the previous lithium cobalt oxide batteries, SANYO, SAMSUNG cylindrical batteries have completely stopped production of lithium cobalt oxide batteries and turned to the manufacture of ternary batteries. At present, most of the small high-rate power batteries at home and abroad use ternary batteries. Cathode material.

5. Examples of the use of ternary lithium batteries in electric vehicles in my country:

The ternary lithium battery used in BAIC’s new energy vehicle Saab EV is structured with aluminum-plastic soft packaging. Its capacity is 10-15% higher than that of steel-case lithium batteries of the same size and 5-10% higher than aluminum-shell batteries; It is 40% lighter than steel shell lithium batteries with the same capacity and specifications, and 20% lighter than aluminum shell batteries; the thickness can be less than 1mm; the thickness of the battery can be increased or reduced according to customer needs; at most, air drum will occur in case of impact, which can ensure Safe; the internal resistance is small, which greatly reduces the self-consumption of the battery.

Chery has prepared a new set of battery components for eQ electric vehicles. The core battery pack is a ternary lithium battery pack. The charging energy is 30% higher than in the past. In order to improve the performance of the battery pack, a 32-bit battery management system is specially matched to greatly enhance the vehicle’s endurance and maximum range. It can reach 200 kilometers.

It is not difficult to understand from a point of view that my country has made good progress in the research and development and even application of ternary lithium batteries, but the gap with the international first-class standards is still quite obvious. After all, in 2009, the Obama administration has listed ternary lithium batteries as a new The field of energy subsidies. However, my country has an urgent demand for the development of new energy. Therefore, the ecological environment will greatly promote the development of new energy. As a small but important neighborhood of new energy, ternary lithium battery will also meet Come a period of rapid development.

Mylion battery website: https://myliontech.com/