Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 6 (Xinhua)-- BMW promises that the next generation of electric vehicles will bring nearly 1000km mileage, 30% higher charging speed, lower costs and significantly lower carbon emissions.

A top battery engineer at BMW believes that such days may be numbered in the future, and that without adding something "game-changing", such as silicon, we may be close to the limit of what lithium-ion batteries can do today. but he believes that lithium-ion batteries will remain a widely used industry standard even in the years to come.

"from an energy density point of view, I would say that we have seen the best chemical composition of lithium-ion batteries in industrial applications," said Simon Erhard Erhard, director of energy, performance and life for BMW's sixth-generation batteries. "I think it has reached its peak."

Erhard believes that the "next big historical node" of battery development may be solid-state batteries. He revealed that BMW's recently opened Battery Manufacturing capability Center in Munich is working with Europe's top academic talent to research and develop the technology.

In addition, BMW and Ford are also major investors in startup Solid Power. They hope to be the first company to commercialize the technology. This means that the company's first solid-state battery will be used in Ford or BMW models. Of course, many other car companies are also working on this technology, such as GM, Honda, Volkswagen, Hyundai and Toyota.

In fact, a lot of research and development in the automotive industry revolves around the improvement and expansion of lithium-ion batteries, Erhard said.

He believes that while engineers can make various changes to current lithium-ion batteries to expand their range, chemical composition and life, it has become increasingly difficult to make big improvements. Automakers such as BMW need to achieve their aggressive electric vehicle sales and decarbonization goals in a cost-effective manner.

"if you want a well-balanced system to bring to market on a large scale, I think it has reached its peak," Erhard said. " For BMW currently on the road and the upcoming "Neue Klasse" electric car, he said it was still based on lithium-ion batteries, but he thought that could change in the next decade.

"about 10 years later, the UK will have solid-state batteries, but now, in the next three to five or even eight years, we will still have to rely on lithium-ion battery technology," Erhard said. then, from our point of view, from 2030, there will be an operational all-solid-state battery. but it will take time to industrialise solid-state semiconductors and prepare for large-scale market applications. "

CTOnews.com learned that Ningde Times, which currently ranks first in the field of power batteries, has previously said that it has been working on solid-state battery research and development for many years, and is now in the first echelon, and the company has been able to make solid-state battery samples, but there is still a long way to go to commercialize solid-state batteries.

In addition, a large number of enterprises are ready to launch semi-solid batteries, such as Weilan New Energy (Weilai) hybrid solid-liquid electrolyte battery can be unveiled as early as the end of this year; Guoxuan Hi-Tech has previously released 360Wh/kg semi-solid battery products, and plans to install cars by the end of the year; Ganfeng Lithium previously said that its first-generation solid-state battery has completed its first delivery in the 50 Taitung Fengshen E70.

At present, the manufacturers of new energy vehicles in China mainly use liquid batteries. However, in the next five years, relying on the existing ternary batteries, the energy density is difficult to achieve the goal higher than the 350Wh/kg, unable to meet the national requirements. In addition, in the process of changing lithium iron phosphate to high nickel ternary, many car companies have battery spontaneous combustion accidents.

Solid state batteries can solve the problems of energy density and safety. The biggest difference between solid-state battery and traditional lithium-ion battery is electrolyte, which uses solid electrolyte to replace the electrolyte and diaphragm of traditional lithium-ion battery.

Compared with liquid lithium batteries, solid-state batteries have the following advantages:

Solid-state batteries replace liquid electrolytes with solid-state electrolytes, greatly reducing the risk of thermal runaway.

The electrochemical window of solid-state battery is more than 5V, which is higher than that of liquid lithium battery (4.2V). It allows the matching of high-energy positive electrode and metal lithium negative electrode, which greatly increases the theoretical energy density.

Solid state battery can simplify the packaging and cooling system, further reduce the battery weight in limited space, and increase the volume energy density by more than 70% compared with liquid lithium battery (graphite negative electrode) to reach 500Wh/kg.

At the same time, the solid-state battery also has some disadvantages, such as its fast charging performance is not good, and the physical contact will become worse during the cycle, affecting its service life. In addition, the preparation process of solid-state battery is also very complicated.

"Weilai plans to deliver 150kwh solid state batteries in the fourth quarter."

"the top students of the University of Electronic Science and Technology break through the solid-state battery: the energy density is 5 times that of the blade battery, and it is full in 3 minutes, and has received 30 million financing."

Ouyang Minggao, Academician of the Chinese Academy of Sciences: a large number of batteries will be decommissioned, and 2025 is a critical period for the transition to solid-state batteries.

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