What are the reasons for the bulging of lithium batteries? How to solve it?

Reasons for the bulging of lithium batteries: 1. Overcharge caused by overcharging will cause all the lithium atoms in the positive electrode material to run into the negative electrode material, causing the original full grid of the positive electrode to deform and collapse, which is also an important reason for the decline in the power of the lithium battery. In this process, there are more and more lithium ions in the negative electrode, and the excessive accumulation causes the lithium atoms to grow out of the tree stump crystals, which makes the lithium battery swell. two. The bulging caused by over-discharge In the first charge and discharge process of the liquid lithium battery, the electrode material and the electrolyte react at the solid-liquid interface to form a passivation layer overturning the surface of the electrode material. The formed passivation film can effectively prevent the passage of electrolyte molecules, but Li+ can be freely inserted and extracted through the passivation layer, which has the characteristics of a solid electrolyte, so this passivation film is called a solid electrolyte interface film , Referred to as SEI. The SEI film has a protective effect on the negative electrode material, so that the material structure is not easy to collapse, and the cycle life of the electrode material can be increased. The SEI film is not static, there will be a little change during the charging and discharging process, the most important thing is that some organic matter will undergo reversible changes. After the lithium battery is over-discharged, the SEI film is reversibly broken, and the SEI that protects the negative electrode material is destroyed, which causes the negative electrode material to collapse, thereby forming a bulging phenomenon. Third, the problem of the level of lithium battery processing and manufacturing, the electrode coating is uneven, and the processing technology is relatively rough. Fourth; the violent reaction of the short circuit generates a lot of heat, which in turn causes the electrolyte to analyze and vaporize, and the battery bulges. How to solve the bulging lithium battery? The bulging of the lithium battery will affect the use and cannot be put into the mobile phone or digital camera. In addition, the presence of gas between the battery plates will also affect the charging and discharging capacity of the battery. The lithium battery has strict requirements on the charger and cannot be installed at will. The power supply is sloppy charging. It is only possible to use a special charger for lithium batteries. If the charger used does not meet the requirements, the battery will be swollen at the slightest level, and a safety accident or even an explosion may occur. The bulging lithium battery must not be used anymore. Recycling is currently not practical in our country. It can only be resolved as scrap. The bulging lithium battery can be discarded straight away, because the power capacity is already very small, and there is no power to speak of after a short circuit. Lithium batteries generally need to be recycled professionally to prevent pollution. If there is no way to solve them, throw them in the sorted recycling trash bin at the service point of the telecommunications service provider. So remind everyone that the lithium battery bulge is already a precursor to a major problem, and it is not recommended to use it again. It may be short-circuit, heat generation, smoke, burning and other unimaginable consequences if it continues to be used. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the differences between lead-acid/lithium battery electric vehicles?