Lithium battery safety issues
1. Cobalt acid: The main feature of this preparation method is that a large amount of lithium ions remain at a positive charge level when fully charged. The negative level, in other words, holding a large amount of adhesion to the level is not lithium ions, but in the case of overload, the level of unnecessary lithium ions in the grade is still negative, because it cannot completely appear in the negative metal lithium, because This kind of metal lithium crystal is a network structure, so it is called twins . Once twins appear, it will give a chance to poke through the diaphragm. Diaphragm breakdown will cause internal short-circuit failure. Since the electrolyte of a lithium battery is an important part of carbonate, lightning and melting point are low, so it will ignite or even explode under high temperature conditions. In a small-volume power supply, the formation of lithium dendrites is very easy to control. Therefore, currently lithium cobalt oxide is limited to small size such as portable electronic products and cannot be used for power supply.
(2): The above theoretical energy density can be greatly improved on the basis of concrete. The theory of relativity is in lithium cobalt oxide, which can give full play to its high efficiency, but lithium cobalt oxide electrolyte is also selected from raw materials and polymer rechargeable batteries. Lithium and organic chemistry, so there is still no safety issue to deal with. From an application point of view, if the rechargeable battery is short-circuited, it will cause overcurrent. The battery electrolyte of lithium polymer batteries is a colloidal solution, which is not easy to leak, which eliminates the possibility of liquid leakage, but will cause more intense ignition. Therefore, fire is a greater safety hazard for lithium polymer batteries.
lithium battery customization
Third, lithium manganese oxide: Lithium manganese oxide raw materials have certain advantages. It can ensure that in the case of full grid electricity, positive lithium ions can be completely put into the negative carbon hole, rather than lithium cobalt oxide will be at a positive level. A certain residue, thus preventing the formation of twins from the source. This is the basic theory of understanding. In fact, if the lithium manganese acid battery is subjected to a strong external force or the whole process is manufactured fake and inferior, it is likely that the rechargeable battery will move quickly in the charging cycle system of the whole process. When the negative stage cannot fully accept lithium ions, twins will appear. In order to prevent this kind of bad influence, it is necessary to ensure the test when charging the battery in the original factory. In summary, lithium manganese acid batteries that meet the inspection standards are generally not prone to production safety ac cidents. Due to the solid structure of lithium manganese oxide, its air oxidation characteristics are far inferior to that of lithium cobalt oxide. Even if it is an external short-circuit fault (not an internal short-circuit fault), the foundation can prevent the ignition and explosion caused by the precipitation of metal lithium.
IV. Lithium iron phosphate: It is an ideal power battery that can be used for pneumatic tools to drive cars. The basic theoretical volume of lithium iron phosphate is 170mAh/g, and it is made of raw materials with a specific volume of 160mAh/ g. In terms of safety factor, lithium iron phosphate has high thermal stability, while 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, which must be improved through modified material technology, so the volume is too large, and the electrolyte used in lithium batteries is more. Moreover, due to the large size and weak consistency of rechargeable batteries, lithium iron phosphate technology is still in the scientific research stage at this stage .