Lithium iron phosphate (LiFePO4) battery is more and more widely used in lead-acid replacement because its charge-discharge curve perfectly overlaps that of lead-acid battery, and the lithium iron phosphate battery does not contain any heavy metal elements harmful to the human body. How safe is the lithium iron phosphate battery?

　　This question should be answered from three aspects: material/structure stability, production process, and charge and discharge characteristics.

　　1. Lithium iron phosphate battery is currently the safest cathode material for lithium ion batteries. It does not contain any heavy metal elements harmful to the human body. It is difficult for oxygen to precipitate in its olivine structure, which improves the stability of the material.

　　2. The production process of lithium iron phosphate batteries is roughly the same as that of other types of lithium batteries. The difference is that the internal arrangement of the lithium iron phosphate materials is more uniform, which promotes the formation of a balanced voltage platform, which can keep the chemical state of the battery stable during operation.

　　3. 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 always in a safe environment.

　　Not only that, it is difficult for lithium iron phosphate batteries to undergo violent oxidation-reduction reactions during high-rate discharge, even during overcharge and discharge. Therefore, lithium iron phosphate batteries can maintain the stability of the physical structure during charge and discharge, which eliminates the hidden danger of battery explosion caused by the increase in volume.

　　The P-O bond in the lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse and generate heat or form strong oxidizing substances like a lithium cobalt oxide battery. Therefore, the lithium iron phosphate battery has good safety.