The theoretical electromotive force is defined by the difference of electrical potential generated by the combination of the positive and negative electrode materials. Just as atoms and molecules have individuality, the energy of generated electrons also differs by the electrochemical reaction. And Electricity supplied amount depends on the type of battery. The electric characteristics of the battery can be described by the standard electrode potential which can theoretically give out the potential.Įlectricity is generated through the chemical reaction in the battery. This second line is described the standard electrode potential E 0 by the electrochemical reaction. Because the chemical reaction is irreversible or the cost is high for charging even if it is a reversible reaction, it is disposable. On the other hand, primary batteries cannot be charged. The electrons sent from the external power supply cause a reverse electrochemical reaction in the rechargeable battery. However, it is possible to return to the state before discharge by causing a chemical reaction that extracts electricity from the positive electrode and gives electrons to the negative electrode.Īn oxidation reaction occurs at the positive electrode and a reduction reaction occurs at the negative electrode by discharge.
In a fully discharged battery, substances in the battery maintain chemical equilibrium without any electrochemical reaction. On the other hand, charging is sending electricity to storage batteries for reuse. In other words, battery can keep generating electricity until fully discharge. These chemical reactions continue until there is no substance necessary for the reaction. The redox reaction occurring at each electrode differs depending on the material of the electrode and the electrolyte solution. In other words, the surplus electrons generated at the negative electrode move to compensate for the missing electrons by the reduction reaction that occurs at the positive electrode. On the other hand, a reduction reaction occurs by absorbing electrons at the positive electrode. The negative electrode emits electrons by the oxidation reaction caused by bonding with oxygen. There are the positive and negative electrodes in the battery. We will explain how electricity is generated by the electrochemical reaction in the battery. Electrochemical reactions occur in primary or rechargeable batteries, and electrons to be emitted by these reactions. Discharge take electricity from the battery.
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