Carbon electrode corrosion is generally caused by two situations. One is that the performance of the electrode material is not good or it is mixed with impurities such as solution and silicone grease. The treatment method is to continue to use it. The second is that the crystal grains become rough, which is caused by pollutants such as silicone grease, carbon oil, and silica powder. The treatment method is cleaning. Lithium iron phosphate and organic electrode silicon will be corroded with inorganic salt and strong acid after filling, and methods can be taken according to the situation.

Complementing @cc's answer, the second point is due to interaction forces, since aluminum is very brittle.

Judging from the change of the surface, it seems that the lithium iron phosphate is oxidized and corroded to a certain extent. There are two reasons for the nature of this corrosion phenomenon: 1. Defects in the performance of electrode materials 2. Defects in functional changes will not directly lead to the occurrence of corrosion, but functional changes cause this phenomenon

The aluminum sheet itself does not have the problem of high-temperature deterioration, but the changes in the compression rate during the casting process, the extrusion degree of stamping, and the pressure level will cause the aluminum sheet to become a so-called aluminum alloy. Such aluminum will undergo so-called deterioration at high temperatures. the phenomenon, leading to corrosion.

There must be reasons for high-temperature changes. The most common cause of corrosion is that the electrodes are easy to contact. If the anti-oxidation measures are not in place, it is easy to contact the metal. The length of the electrode material can be small, but it is easy to corrode. The second corrosion is due to the material itself. The chemical or physical properties of the material are not good, or even unqualified, which will lead to the occurrence of corrosion. If the length of the material is too short, it will increase the chance of corrosion, and the size of the material will also greatly increase the chance of corrosion.

Theoretically speaking, the board problem is relatively large, and the active sodium silicate in the resin has a softening effect. However, there is also a bonding ability between the plates, so the corrosion phenomenon between the plates will only be local. Therefore, the corrosion phenomenon is also relatively local, mainly depending on the level of the two parts. The second is the dosage. But from a physical and chemical point of view. Electrode materials will corrode. And because hot pressing leads to fast, and there is almost no boundary resistance, so as long as there are corrosion spots or stereotypes after corrosion, the shape problem is more complicated.

Pay attention to the structure, often after several times of corrosion, the electrodes with a lot of thickness can be overgrown, because the localized corrosion is complicated, resulting in obvious corrosion over thickness on the surface. length, basically nonexistent.