Zinc-nickel battery is a kind of rechargeable battery that has developed more maturely in recent years. It has enriched the types of batteries on the market. With its own advantages, it has gradually been recognized by more people and recognized by the market. The working principle of zinc-nickel rechargeable battery is based on electrochemical redox reaction.
The working principle of zinc-nickel battery is to convert chemical energy into electrical energy through redox reaction between zinc and nickel ions.
Composition of zinc-nickel rechargeable battery
Although AA and AAA batteries are small, their structure is not simple. Zinc-nickel rechargeable battery is mainly composed of positive electrode, negative electrode, electrolyte, diaphragm, etc.
Working principle of zinc-nickel rechargeable battery
Zinc-nickel battery uses nickel hydroxide as positive electrode material and zinc oxide as negative electrode material, and releases current or charges through the movement of ions between positive and negative electrodes. The common oxidation of zinc element is +2, so charging and discharging will move two electrons, instead of only one electron like nickel-hydrogen battery.
During the discharge process, the negative electrode element releases electrons through chemical reaction, generating current, which flows into the positive electrode through the electrical appliance. During the charging process, the elements on the positive electrode undergo a chemical reaction to release electrons and move to the negative electrode through the electrolyte until charging is complete.
Battery chemical reaction
Discharge: Zn + 2 NiO(OH) + 2H2O → Zn(OH)2+ 2 Ni(OH)2
Charge: Zn(OH)2+ 2 Ni(OH)2 → Zn + 2 NiO(OH) + 2H2O
How to charge Zinc Nickel battery
Zinc-nickel rechargeable batteries require a separate charger or a universal charger, but cannot use the common nickel-metal hydride rechargeable batteries on the market.
The open circuit voltage of zinc-nickel batteries is about 1.85V, so a charger with a higher output voltage is required to ensure the normal charging of zinc-nickel batteries. At present, chargers are generally equipped with USB cables that are compatible with mobile phone charging adapters, which makes it easier to find a power source.
