Which is safer, lithium iron phosphate battery or lithium cobalt oxide battery?

The safety comparison of lithium iron phosphate battery and lithium cobalt oxide battery The theoretical capacity of lithium iron phosphate battery and lithium cobalt oxide battery is 170mAh/g, and the actual reachable capacity of the material is 160mAh/g. In terms of safety, the lithium iron phosphate battery has high thermal stability and low electrolyte oxidation capacity, so the safety is high; but the disadvantages are low conductivity, large volume, large electrolyte consumption, and poor battery consistency due to large capacity . The biggest feature of lithium cobalt oxide battery preparation is that after fully charged, there is still a large amount of lithium ions left in the positive electrode, that is to say, the negative electrode cannot accommodate more lithium ions attached to the positive electrode, but the In the charged state, the excess lithium ions on the positive electrode will still swim to the negative electrode, because it cannot be fully contained and turned back to form metallic lithium on the negative electrode. Because metallic lithium is a dendritic crystal, it is called a dendrite. , It will give the opportunity to pierce the diaphragm, and the puncture of the diaphragm will form an internal short circuit. The safety of lithium iron phosphate batteries: Lithium iron phosphate batteries are currently the safest cathode material for lithium batteries, and do not contain any heavy metal elements harmful to the human body. Oxygen is difficult to precipitate in its olivine structure, which improves the stability of the material. The lithium iron phosphate battery pack has undergone strict safety tests and will not explode even in a traffic accident. When the lithium iron phosphate battery is charged and discharged, because the iron ion has a weak oxidation capacity and will not release oxygen, it is naturally difficult to undergo a redox reaction with the electrolyte, which makes the charging and discharging process of the lithium iron phosphate battery in a safe environment. The PO bond in the lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse and heat up or form strong oxidizing substances in the same structure as lithium cobalt oxide. Therefore, the lithium iron phosphate battery has good safety. . Safety of lithium cobalt oxide batteries: After long-term development, lithium cobalt oxide batteries have formed four product lines: cylindrical batteries, polymer soft pack batteries, aluminum shell batteries and steel shell batteries. These products are used in high-end and medium-sized batteries. High-end and low-end markets. Lithium cobalt oxide battery has stable structure, high specific capacity, outstanding comprehensive performance, but its safety is poor, and the cost is very high. It is mainly used for small and medium-sized batteries, and is widely used in notebook computers, mobile phones, MP3/4 and other small electronic devices. Said voltage is 3.7V. 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 factors will affect the low-temperature performance of lithium iron phosphate batteries?