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　　During the discharge process of the battery, it belongs to the primary battery reaction. This type of electrode reaction involves electrolyte solution. If it can be analyzed whether the electrolyte solution is involved in the electrode reaction, the writing of the negative electrode reaction formula and the positive electrode reaction formula can be easily solved.

　　Taking lead-acid batteries as an example, we will analyze the writing method of electrode reaction equations.

　　The total reaction of lead-acid batteries is: Pb+PbO2+2H2SO4=2PbSO4+2H2O

　　According to the analysis of the working principle of the primary battery, the negative electrode loses electrons and undergoes an oxidation reaction. It can be seen that: Pb 2e -=Pb2+①, the generated Pb2+enters the electrolyte solution, and Pb2+cannot coexist with SO42- in the solution. The reaction must continue to generate PbSO4, that is, Pb2++SO42-=PbSO4 ②. Therefore, the negative electrode reaction formula of the primary battery is ①+②, that is, Pb 2e -+SO42-=PbSO4; The positive electrode is the electrode where electrons undergo a reduction reaction, with PbO2+2e -=Pb2++2O2- ①. Pb2+and O2- enter the solution. As the electrolyte solution is an H2SO4 solution, O2- cannot exist alone in an acidic environment. The particles that can be combined with O2- are H+and H2O. O2- preferentially combines with H+to generate H2O in an acidic environment, resulting in a reaction at the positive electrode: 4H++2O2-=2H2O ②; Pb2++SO42-=PbSO4 ③ According to the above analysis, the positive electrode reaction formula is ①+②+③, that is, PbO2+2e -+SO42-+4H+=PbSO4+2H2O. (Note: Charge conservation and mass conservation should be followed in the electrode reaction equation; when adding the negative and positive reaction equations to obtain the total reaction, it should be noted that the number of electrons gained and lost should be equal.)

　　For example, Ag Zn high-energy batteries (button batteries) are composed of Ag2O, Zn, and KOH solutions. The total reaction is: Zn+Ag2O+H2O=Zn (OH) 2+2Ag

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