Lithium battery pack anode materials show diversity

by:CTECHi     2021-07-14

Lithium battery pack anode materials show diversity, who is more powerful? With the advancement of science and technology, lithium battery pack anode materials show diversity characteristics. At present, the negative electrode material of lithium battery pack has developed from a single artificial graphite to natural graphite, mesophase carbon microspheres, artificial graphite, soft carbon/hard carbon, amorphous carbon, lithium titanate, silicon carbon alloy and other negative electrode materials. A situation of coexistence.

The negative electrode of lithium ion battery is made of negative active material carbon materials or non-carbon materials, binders and additives to make a paste-like adhesive evenly smeared on both sides of the copper foil , After drying and rolling. The negative electrode material is the main body of lithium-ion batteries to store lithium, allowing lithium ions to be inserted and extracted during charging and discharging.

The anode materials of lithium battery packs mainly affect the first efficiency and cycle performance of lithium batteries. The performance of anode materials also directly affects the performance of lithium batteries. The anode materials account for the total cost of lithium batteries. About 5~15%. The types of anode materials include carbon-based anodes and non-carbon anodes. From a technical point of view, anode materials for lithium-ion batteries in the future will show diverse characteristics.

Comparing the four anode materials, which one is more powerful?

Control the 'home field' graphite

Currently, the anode materials are mainly natural graphite and artificial graphite, which have their own advantages and disadvantages. Natural graphite has a higher gram capacity, simple process, and low price, but it has poor liquid absorption and circulation performance;

The process of artificial graphite is more complicated and more expensive, but it is cycled and safe. The performance is better. Through technical improvements in various means, both of these graphite anode materials can 'strengthen their strengths and avoid weaknesses

Exclusive graphene

Graphene is a two-dimensional crystal composed of carbon atoms with a thickness of only one layer. It is widely praised by scientists because of its thin texture, high hardness and fast electron movement speed, and is known as the 'king of new materials'.

The industry's doubts about the use of graphene as a negative electrode material are also constantly fermenting. If graphene is used as a lithium battery negative electrode material, an independent upstream and downstream industrial chain is required, which is expensive. However, there are still some domestic companies moving forward, and well-known companies have begun to lay out the graphene industry.

Mesophase carbon microspheres with stable performance

Mesophase carbon microspheres have a highly ordered layered structure, It is a typical soft carbon with a high degree of graphitization, stable structure and excellent electrochemical performance. Mesophase carbon microspheres have higher rate performance than natural graphite and artificial graphite, and have obvious advantages when used in aircraft models and power tools. In addition, its thermal stability and chemical stability determine that it is not prone to chemical reactions, and the use of lithium battery packs increases the safety guarantee. However, the production cost is high, the process is complicated and easy to be replaced, so the production and sales of mesocarbon microspheres have always been in a stable position, and they have not been developed too much.

'New World' silicon-carbon composite material

The theoretical capacity ratio of silicon anode material reaches more than 4200mAh/g, which is much higher than Graphite negative electrode (372mAh/g). However, the silicon anode material has a natural defect, that is, lithium is embedded in the silicon unit cell, which will cause serious expansion of the silicon material, resulting in a rapid decrease in capacity. In order to overcome these shortcomings of silicon anode materials, scientists have combined silicon anode and graphite materials. Combined, the silicon-carbon composite material was born, and it is called 'the new continent of lithium battery anode materials.' However, the use of silicon-carbon composite materials to improve battery energy density is now one of the accepted directions in the industry.

Although the four anode materials have their own merits. However, from the perspective of the current anode material market, the future development of graphene is elusive. In recent years, artificial graphite, which has been the number one consumer in recent years, is also facing the challenge of high-performance silicon-carbon composites. The use of silicon-carbon composites by Tesla, the world leader in the new energy vehicle market, will surely set off a wave of silicon-carbon composites. Material boom. The mesophase carbon microspheres, which have been in a stable position, will not fluctuate much in the future.

Well, the four anode materials don’t even think about winning, because they have their own advantages in performance, and the lithium battery pack anode material market may be re-washed in the future. brand.

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