Soft-pack lithium battery core materials and advanced technology breakthroughs -Lithium - Ion Battery Equipment
A few days ago, the "Second New Energy Vehicle and Power Lithium Battery (CIBF2021 Shenzhen) International Exchange Conference" was held in Shenzhen. At the special forum named "Soft Pack Battery Core Materials and Advanced Technology Breakthrough" named by Fengfan Co., Ltd., Guangzhou Automotive Mei Ao, a senior engineer of the Automotive Engineering Research Institute of the Group Co., Ltd., gave a speech on the theme of "New Materials Promote the Performance Improvement of Power Lithium Batteries".
According to reports, the Guangzhou Automobile Research Institute is a research and development institution directly under the GAC Group. In addition to the Guangzhou General Research Institute, it has branches in Shanghai and overseas. The research institute has 4,300 R&D personnel, mainly engaged in the research and development of complete vehicles and key components. GAC Research Institute is a technology center recognized by the state. In the biennial evaluation, it ranked sixth (automotive) among 1,563 technology centers in various industries across the country in 2019. In terms of electrification, the research institute has done a lot of development on key components, including batteries and electromechanical coupling systems.(Lithium - Ion Battery Equipment)
Mei Ao said that the material has a great influence on the performance of the battery. From the perspective of the whole vehicle, in the final analysis, it is to meet the needs of consumers.
First of all, to increase the cruising range of the vehicle, the energy density of the battery must be increased, and the energy density of the ternary battery must mention high-nickel materials. Through the calculation and analysis of battery energy density, for high-nickel ternary materials, only when combined with more advanced silicon-carbon anodes can the advantages of high energy density be obtained; if only matched with graphite, with medium nickel After the ternary increases the voltage, the density is equivalent.(Lithium - Ion Battery Equipment)
In terms of cost reduction, the proportion of nickel can be increased by reducing the content of cobalt used. "We have done a lot of analysis and calculation. In the future, there will be a breakthrough in the smelting technology of laterite nickel ore, which will be a good way to reduce the cost of high-nickel ternary. The important thing is to use cheap laterite nickel ore. The mine also contains cobalt, which can also be used.” Mei Ao said.
The use of silicon anodes is also a direction to pay attention to. Mei Ao said that there are now silicon-oxygen and silicon-carbon technical routes. In principle, silicon is nanometerized. Its performance, cost performance and practicability have certain advantages in terms of cost reduction potential. It is estimated that when it is actually mass-produced, silicon oxide will reach the cost of high-end graphite, which is acceptable for high-performance vehicles.
Mei Ao also said that when using silicon, it is important to pay attention to the application barriers of expansion, including the expansion of silicon materials, the expansion of SEI film elements, and the damage of electrode structures caused by expansion. To solve these problems, it is not enough to rely on materials alone. Restrict and buffer from the aspects of pole pieces, batteries, modules, etc. The binder is also a very important part, and a suitable special binder will greatly help the use of silicon.
In terms of safety, when talking about the safety research and development of the electrolyte, Mei Ao said that it is important to use high-mountain resistors and flame-retardant special electrolytes. Through experiments, it was found that the effect of flame-retardant electrolytes on improving thermal runaway is relatively obvious. The yield test of C80 with different electrolytes and pole pieces shows that the use of flame-retardant electrolytes will significantly improve the temperature of thermal runaway and the heat release of thermal runaway.
According to reports, the Guangzhou Automobile Research Institute is a research and development institution directly under the GAC Group. In addition to the Guangzhou General Research Institute, it has branches in Shanghai and overseas. The research institute has 4,300 R&D personnel, mainly engaged in the research and development of complete vehicles and key components. GAC Research Institute is a technology center recognized by the state. In the biennial evaluation, it ranked sixth (automotive) among 1,563 technology centers in various industries across the country in 2019. In terms of electrification, the research institute has done a lot of development on key components, including batteries and electromechanical coupling systems.(Lithium - Ion Battery Equipment)
Mei Ao said that the material has a great influence on the performance of the battery. From the perspective of the whole vehicle, in the final analysis, it is to meet the needs of consumers.
First of all, to increase the cruising range of the vehicle, the energy density of the battery must be increased, and the energy density of the ternary battery must mention high-nickel materials. Through the calculation and analysis of battery energy density, for high-nickel ternary materials, only when combined with more advanced silicon-carbon anodes can the advantages of high energy density be obtained; if only matched with graphite, with medium nickel After the ternary increases the voltage, the density is equivalent.(Lithium - Ion Battery Equipment)
In terms of cost reduction, the proportion of nickel can be increased by reducing the content of cobalt used. "We have done a lot of analysis and calculation. In the future, there will be a breakthrough in the smelting technology of laterite nickel ore, which will be a good way to reduce the cost of high-nickel ternary. The important thing is to use cheap laterite nickel ore. The mine also contains cobalt, which can also be used.” Mei Ao said.
The use of silicon anodes is also a direction to pay attention to. Mei Ao said that there are now silicon-oxygen and silicon-carbon technical routes. In principle, silicon is nanometerized. Its performance, cost performance and practicability have certain advantages in terms of cost reduction potential. It is estimated that when it is actually mass-produced, silicon oxide will reach the cost of high-end graphite, which is acceptable for high-performance vehicles.
Mei Ao also said that when using silicon, it is important to pay attention to the application barriers of expansion, including the expansion of silicon materials, the expansion of SEI film elements, and the damage of electrode structures caused by expansion. To solve these problems, it is not enough to rely on materials alone. Restrict and buffer from the aspects of pole pieces, batteries, modules, etc. The binder is also a very important part, and a suitable special binder will greatly help the use of silicon.
In terms of safety, when talking about the safety research and development of the electrolyte, Mei Ao said that it is important to use high-mountain resistors and flame-retardant special electrolytes. Through experiments, it was found that the effect of flame-retardant electrolytes on improving thermal runaway is relatively obvious. The yield test of C80 with different electrolytes and pole pieces shows that the use of flame-retardant electrolytes will significantly improve the temperature of thermal runaway and the heat release of thermal runaway.
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