Introduction to the four battery performance of ternary lithium batteries

Ternary lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium batteries. Lithium batteries do not contain metallic lithium and can be charged. The fifth generation of rechargeable batteries, lithium metal batteries, was born in 1996, and its safety, specific capacity, self-discharge rate, and functional-price ratio are superior to those of lithium batteries. Because of its own high-tech requirements, only a few companies in a few countries are currently producing such lithium metal batteries. Lithium nickel cobalt manganese oxide (ternary) battery: It has greatly improved the theoretical specific energy that can be used in practice. As far as the lithium cobalt oxide battery is concerned, it can better play high-capacity applications, but from the point of view of materials , The ternary battery uses lithium nickel cobalt manganese oxide and organic electrolyte, which has not yet fundamentally solved the safety problem. If the battery is short-circuited, excessive current will occur, which will cause safety hazards. Lithium iron phosphate battery: The capacity is 170mAh/g, and the practical capacity of the material is 160mAh/g. In terms of safety, lithium iron phosphate has high thermal stability and low electrolyte oxidation ability, so the safety is high; but the disadvantages are low conductivity, large volume, and large amount of electrolyte, because of the large capacity and poor battery consistency. Lithium cobalt oxide battery: The biggest feature of the preparation is that after the overflow, there are still a large amount of lithium ions left in the positive electrode, that is to say, the negative electrode cannot contain more lithium ions attached to the positive electrode. In the overcharged state, the remaining lithium ions on the positive electrode will still swim to the negative electrode, because they cannot be completely contained and changed back to form metallic lithium on the negative electrode. Because metallic lithium is a dendritic crystal, it is called a dendrite. Structure, it will give the opportunity to pierce the barrier, and the barrier piercing will form an internal short circuit. Because the key component of the electrolyte is carbonate, the flash point and boiling point are low, and it will be incinerated or even blasted at a higher temperature. The structure of controlling lithium dendrites is relatively simple on small-capacity lithium batteries, so lithium cobalt oxide batteries are currently limited to small-capacity batteries such as portable electronic devices, and cannot be used for power lithium-ion batteries. Lithium manganese oxide battery: The material of the lithium manganese oxide battery has certain advantages. It can ensure that the lithium ions of the positive electrode can be completely embedded in the carbon pores of the negative electrode in the fully charged state, instead of a certain residue in the positive electrode like lithium cobalt oxide This fundamentally guards against the occurrence of dendrites. In theory, this is the case. In practice, if lithium manganese oxide batteries encounter strong external uses or cut corners during the preparation process, they may cause the battery to instantly form lithium during the charge and discharge cycle. The ions move quickly. When the negative electrode does not have time to completely receive lithium ions, dendrites are formed. Beware of this consequence to be ensured from the test when the battery leaves the factory. In short, the qualified lithium manganese battery generally does not have safety accidents. The stable structure of lithium manganate makes its oxidation function far lower than that of lithium cobalt oxide. Even if an external short circuit, it can basically be guarded against incineration and explosion caused by metal lithium. . Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the important aspects of UPS power storage batteries?