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Improve the Positive and Negative Lithium-ion Diffusion Capacity

Author: Source: Datetime: 2016-10-28 15:46:19

The rate of deintercalation and intercalation of lithium ions in the positive / negative electrode active material, that is, the rate at which lithium ions come out of the positive / negative electrode active material, or from the positive / negative electrode surface into the active material The speed in the end how fast, which is an important factor in charge and discharge rate. The lithium ions include lifepo4 batteries.


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For example, every year there are many marathons around the world, although the basic starting at the same time, but the road width is limited, but many people involved (sometimes up to tens of thousands of people), resulting in crowded, with participants in the body The quality of the uneven, the team will eventually become a long battle front. It was soon to reach the end, it was late for a few hours, some people went to fainting, halfway on the stop.

 

Lithium ions in the positive / negative diffusion and movement, and marathon basically the same, running slow, run fast have, with their choice of different lengths of the road, seriously hampered the end of the game (everyone Finish). So, we do not want to run a marathon, the best we all run 100 meters, the distance is short enough, everyone can quickly reach the end, in addition, the runway should be wide enough, not crowded, the road is not twists and turns, straight The best, to reduce the difficulty of the game. As a result, the referee gave a ring, a mighty force toward the end, the game quickly ended, excellent performance rate.

 

At the cathode material, it is desirable that the pole piece be sufficiently thin, that is, the thickness of the active material is small, which is equal to shortening the race distance. It is desirable to increase the density of the cathode material as much as possible. In the active material, there must be sufficient pore clearance, lithium-ion to stay out of the race channel, while the "runway" distribution should be uniform, not somewhere, there is no place, it is necessary to optimize the cathode material structure, Change the distance between the particles and structure, so uniform distribution.

 

The above two points are contradictory to increase the compaction density. Although the thickness becomes thinner, the particle gap will become smaller, and the runway will become crowded. On the contrary, maintaining a certain particle gap is not conducive to making the material thin. So you need to find a balance in order to achieve the best lithium-ion migration rate. Improve the rate is good for batteries, and it also beneficial to improve the usage of solar powered portable generator.


In addition, the cathode material of different materials, lithium ion diffusion coefficient has a significant impact. Therefore, the choice of lithium ion diffusion coefficient is relatively high cathode material, is also an important direction to improve the rate performance.

 

The treatment of negative electrode material is similar to that of cathode material, and it is mainly to proceed from the structure, size and thickness of the material to reduce the concentration difference of the lithium ion in the anode material and improve the diffusion ability of the lithium ion in the anode material. The performance will help more people to use lithium batteries in portable solar power generator.

 

In recent years, carbon nanotubes (nanotubes, nanowires, nanospheres, etc.) have been used to replace the conventional negative layer structure, which can significantly improve the specific surface area, internal structure and properties of the anode materials. Diffusion channel, thereby greatly enhancing the rate of negative electrode material performance.

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