1、Concept.
Ternary polymer lithium batteries are lithium batteries that use lithium-nickel-cobalt-manganese ternary cathode material for the cathode material.
There are many kinds of cathode materials for lithium-ion batteries, mainly lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc.. At present, ternary material cells replace the previously widely used lithium cobaltate cells, widely used in the field of laptop batteries, and in recent years ternary lithium batteries have also begun to be used in the electric vehicle neighborhood.
2、Advantages.
Compared with lithium iron phosphate and lithium manganate batteries, it has high capacity, long life and light weight of the battery; it is a more balanced material in terms of capacity and safety, and has better cycle performance than normal lithium cobaltate; its nominal voltage is only 3.5-3.6V in the early stage due to technical reasons, which limits the range of use, but at present, with the continuous improvement of the formula and structural perfection, the nominal voltage of the battery has reached 3.7V. In terms of capacity, it has reached or exceeded the level of lithium cobalt-acid batteries.
--Why is Tesla so favorable to ternary lithium batteries?
Tesla has tried more than 300 kinds of batteries on the market, the reason for choosing ternary lithium batteries is its greater energy density and better stability and consistency; can effectively reduce the cost of the battery system; small size controllability and safety are constantly improving. (From KurtKelty, director of battery technology at Tesla)
3, disadvantages.
Higher cost; when applied to electric vehicles require extremely strict battery management system, only a few foreign models such as Tesla used in large numbers, China's electric vehicle neighborhood is still dominated by lithium iron phosphate, but a few electric car manufacturers have gradually begun to apply.
4, development.
The world's five largest battery cell brands SANYO, PANASONIC, SONY, LG, SAMSUNG has launched ternary material cells (see the world's first-class ternary lithium battery technology is concentrated in Japan and South Korea), a considerable part of the notebook battery line are used ternary material cells to replace the previous lithium cobalt-acid cells, SANYO, SAMSUNG column battery is a complete cessation of production of cobalt-acid Lithium cells to the manufacture of ternary cells, most of the current domestic and foreign small high rate power batteries use ternary cathode materials.
5, China's electric vehicles using ternary lithium battery example.
--BNA's new energy vehicle Shenbao EV uses ternary lithium batteries in the structure of aluminum-plastic soft packaging, the capacity is 10-15% higher than the same size specifications of steel-cased lithium batteries, 5-10% higher than aluminum-cased batteries; while the weight is 40% lighter than the same capacity specifications of steel-cased lithium batteries, 20% lighter than aluminum-cased batteries; thickness can be The thickness of the battery can be less than 1mm; the thickness of the battery can be increased or reduced according to the customer's demand; only the air bulge will occur at most in case of impact, which can ensure safety; the internal resistance is small, which greatly reduces the self-consumption of the battery.
-- Chery has prepared a new set of battery components for the eQ electric vehicle. The core battery pack is a ternary lithium battery pack, charging energy is 30% higher than in the past. To improve the performance of the battery pack is also matched with a 32-bit battery management system, which greatly enhances the range of the whole vehicle, and the maximum range can reach 200 km.
It is not difficult to understand the point with the surface, China has made good progress in the research and development and even application of ternary lithium batteries, but the gap with the international first-class level is still relatively obvious, after all, in 2009 the Obama administration has included ternary lithium batteries in the field of new energy subsidies. But China's development of new energy is the urgent reality of the demand, so the ecological environment will greatly promote the development of new energy, ternary lithium power battery as a small but important neighborhood of new energy will also usher in a period of rapid development.
