Why do we say that lithium batteries are the most mainstream and the most dangerous?

by:CTECHi     2021-08-19

But as mentioned earlier, if you don’t make progress, the wave of innovation will sooner or later slap you on the backward beach. Earlier last year, the world’s long-standing and most prestigious scientific magazine 'Nature' published an article titled 'Only 10 Years from the Lithium Electronic Battery Revolution'. This article pointed out that the performance of lithium-ion batteries is The rate of price evolution is slowing. Investigating the reasons, there are nothing more than two: First, the technical bottleneck. A battery is essentially a device that can convert stored chemical energy into electrical energy. Therefore, there is a ceiling for the amount of electricity that can be stored in the crystal structure. Take the mobile phone as an example. With the continuous improvement of the hardware level, the technology and performance of the mobile phone have developed by leaps and bounds, but the upgrade of the supporting lithium battery is still faltering. Compared with twenty years ago, the energy stored in battery packs of rechargeable lithium-ion batteries has increased several times. It seems to be advancing by leaps and bounds, but in fact it is far from enough, especially compared to the update speed of high-tech industries such as chips and software. It can be said that lithium batteries are slowly moving towards being 'replaced' from being demanded, irreplaceable, and mainstream. After being applied to new energy vehicles, this 'slowness' becomes more prominent. It is impossible for car companies to put a large number of ternary lithium batteries in a car for a simple reason-weight. With the simultaneous increase in vehicle weight, the actual endurance curve will eventually return to a straight line. Coupled with the fact that the charging facilities have not yet reached the perfect level, the development of ternary lithium batteries in the field of power batteries is bound to take the lead in the decision point. Second, materials. The most important factor that determines the performance of a ternary lithium battery is the material of the two poles of the battery, especially the cathode material. Nickel, cobalt, and manganese, these three metal elements dominate almost everything. Among them, the greatest significance of nickel is to increase the energy density; the role of cobalt is to stabilize the layered structure of the material, and can improve the cycle and rate performance of the material. Indispensable, resulting in no choice. As a result, the prices of nickel and cobalt have shown a continuous surge in 2017, and the market is in short supply. Although there was a decline in the second half of 2018, the irreplaceability in the short term still prompted a price rebound. A number of cathode material companies and lithium battery companies have expressed that for cost reasons, they must look for alternatives. The emergence of 'NCM811 (Nickel: Cobalt: Manganeseu003d8:1:1)' allows the ternary lithium battery to effectively respond to doubts. In principle, compared with the mature '532' and '622With further development in the future, cobalt-free lithium batteries are gradually emerging. But everything has two sides, and NCM811 is not invulnerable. More than one expert has pointed out that the higher the nickel ratio, the worse the thermal stability of the entire cathode material. High temperature instability and low low temperature performance are inherently the shortcomings of ternary lithium batteries. As a result, safety has become an obstacle that must be overcome first. Therefore, many power battery companies focus on safety. Jeffrey Yambrick, vice president of global marketing of Honeycomb Energy Technology Co., Ltd., is very optimistic about NCM811, but he also admits that stability is a problem that must be paid attention to: 'The problem that NCM811 focuses on is How to ensure stability at high temperatures, we have optimized. The Ru0026D team of Honeycomb Energy has improved the cathode material so that the cathode material can work normally at minus 20-60 degrees Celsius, and the high temperature 140-150 degrees Celsius increases the impedance by 3 orders of magnitude. Form a circuit break to ensure the safety of the battery.' Frankly speaking, it is still too early to talk about the end of the ternary lithium battery. One day, once there is a breakthrough in materials, or the ceiling is broken in energy technology, Sanyuan The technical advantages of lithium batteries are expected to be brought into play again.

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