Let's take a closer look at the iron-lithium phosphate battery（LiFePO4）.  

First, let's examine how the iron-lithium phosphate battery（LiFePO4） works. At the positive electrode (iron phosphate), lithium ions move from the negative electrode (lithium metal) to the positive electrode during the charging process, and move from the positive electrode to the negative electrode during the discharging process. These two processes form an electrochemical reaction and transfer lithium ions through the electrolyte, generating electrical energy.

The iron-lithium phosphate battery（LiFePO4） has some special advantages that make it a more popular battery choice. Firstly, it has a relatively high energy density, meaning it stores more energy per unit volume. In addition, the iron-lithium phosphate battery also has a long cycle life, allowing it to be charged and discharged many times.  

Furthermore, the iron-lithium phosphate battery（LiFePO4） has good safety. During charging, the movement of lithium ions is stable and does not pose a risk of fire or explosion. At the same time, the structure of the iron-lithium phosphate battery（LiFePO4） is relatively solid, effectively preventing internal short circuits.  

Finally, the iron-lithium phosphate battery（LiFePO4） is highly environmentally friendly. It does not contain toxic substances and does not pollute the environment during production.