Which lithium ion battery is safer?

1. Lithium cobalt oxide battery: The major feature of the preparation is that when the battery is fully charged, there are still a lot of lithium ions left to the positive level. In other words, the negative stage cannot accommodate a large amount of lithium ions adhering to the positive stage, but in the case of overcharging, unnecessary lithium ions on the positive stage will still swing to the negative stage, because it cannot be completely accommodated. There will be metallic lithium on the negative stage, because this kind of metallic lithium is the crystallization of the network structure, so it is called twins. Once the twins appear, they will give an opportunity to pierce the diaphragm. Diaphragm penetration will cause internal short-circuit failure. Because the important component of lithium-ion battery electrolyte is carbon acid grease, lightning and melting point are low, so it will ignite and even explode under high temperature conditions. It is very easy to manipulate the appearance of lithium dendrites on small-volume lithium-ion batteries. Therefore, lithium cobalt oxide batteries are currently limited to small-volume rechargeable batteries such as portable electronic products, and cannot be used for power lithium-ion batteries. 2. Polymer lithium ion battery: There is a huge improvement in the basic theoretical energy density that can be used. Compared with the lithium cobalt oxide battery, it can better give full play to the high-capacity effect, but in terms of raw materials, Polymer rechargeable batteries also use lithium cobalt oxide and organic chemical lithium-ion battery electrolyte, so the safety factor problem has not yet been dealt with. From an application perspective, if a short-circuit fault occurs in the rechargeable battery, it will cause excessive current. The lithium-ion battery electrolyte of polymer lithium-ion battery is a colloidal solution, which is not easy to leak, which eliminates the probability of liquid leakage, but will cause more intense ignition. Therefore, fire is the greater safety of polymer lithium-ion batteries Hidden dangers. Lithium-ion battery processing customization III. Lithium manganate battery: The raw materials of lithium manganate battery have certain advantages, which can ensure that the positive lithium ions can be completely inserted into the negative carbon pores under the condition of full power , Instead of having a certain residue in the positive stage like lithium cobalt oxide, this prevents twinning from the source. This is based on the basic theory to understand. In fact, if the lithium manganate battery is subjected to strong external force or is shoddy during the whole production process, it is very likely that the rechargeable battery will quickly move lithium ions during the whole process of the battery charging cycle. Twins appear when the negative stage cannot fully accept lithium ions. The prevention of this adverse effect should be ensured from the original inspection of the rechargeable battery. All in all, lithium-ion manganate batteries that meet the inspection standards are generally not prone to safety production accidents. Due to the solid structure of lithium manganese oxide, its air oxidation characteristics are far less than that of lithium cobalt oxide. Even if an external short-circuit failure (not an internal short-circuit failure), it can basically prevent the precipitation of metallic lithium from causing ignition and explosion. 4. Lithium iron phosphate battery: It is an idealized power lithium ion battery that can be used to drive cars with pneumatic tools. The basic theoretical volume of lithium iron phosphate is 170mAh/g, and the specific volume of raw materials is 160mAh. /g. In terms of safety factor, the thermal stability of lithium iron phosphate is high, and the air oxidation capacity of lithium ion battery electrolyte is low, so the safety factor is high; but its disadvantage is that the conductivity is low, and the technology of the material must be modified to improve it. As a result, the volume is too large. Lithium-ion batteries use a lot of electrolyte. Moreover, because of the large volume and the weak consistency of rechargeable batteries, at this stage, the technical nature of lithium iron phosphate is still under scientific research. 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: How to choose and use car batteries