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　　Detailed explanation about lithium iron phosphate batteries

　　Cobalt is expensive in the metal trading market (Co) and has limited storage capacity. Nickel (Ni) and manganese (Mn) are relatively cheap, while iron (Fe) has a large storage capacity. The price of positive electrode materials is consistent with the prices of these metals. Therefore, lithium batteries made with LiFePO4 cathode material should be quite inexpensive. Another characteristic of it is that it does not pollute the environment.

　　The requirements for rechargeable batteries are: high capacity, high output voltage, good charge discharge cycle performance, stable output voltage, high current charge discharge, electrochemical stability, safe use (without combustion or explosion due to overcharging, overdischarging, short circuit and other operational errors), wide temperature range, non-toxic or less toxic, and no pollution to the environment. The choice of LiFePO4 as the positive electrode for lithium iron phosphate batteries has good performance requirements, especially in terms of discharge rate (5-10C discharge), stable discharge voltage, safety (non combustion, non explosion), lifespan (number of cycles), and no pollution to the environment. This is true, and it is currently a high current export power battery.

　　As the positive electrode of the battery, LiFePO4 is connected to the positive electrode of the battery by aluminum platinum, and a polymer separator in the middle separates the positive and negative electrodes. However, lithium ions Li can pass through, while electrons e - cannot. On the right is the negative electrode of the battery composed of carbon (graphite), and copper is connected to the negative electrode of the battery. There is battery electrolyte between the upper and lower ends of the battery, and the battery is sealed by a metal shell.

　　When charging LiFePO4 batteries, lithium ions Li in the positive electrode are transferred to the negative electrode through a polymer separator; During the discharge process, lithium ions Li in the negative electrode are transferred to the positive electrode through the separator. Lithium ions are named after the back and forth transfer of lithium ions during the charging and discharging process.

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