Lead-Acid Battery Discharge

Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

概要

During discharge, lead is oxidized to PbSO₄ at the anode while PbO₂ is reduced to PbSO₄ at the cathode, consuming sulfuric acid and producing water. The cell voltage is about 2.1 V, and six cells in series give the standard 12.6 V car battery. Invented by Gaston Planté in 1859, it remains the world's most recycled product.

参加者

役割 物質 係数 状態
反応物 Lead Pb 1 (s)
反応物 Sulfuric Acid H₂SO₄ 2 (aq)
生成物 Water H₂O 2 (l)

日常の例

The 12V battery that starts your car every morning uses this exact lead-acid chemistry, invented over 160 years ago.

産業上の重要性

鉛蓄電池は450億ドルのグローバル市場を持ち、99%リサイクル可能で自動車の始動・照明・点火システムの主要電源である。UPS、フォークリフト、蓄電池にも広く利用される。

特性

タイプ
Electrochemical
可逆的
はい
エネルギー
発熱性
ΔH
-359.0 kJ/mol

関連する反応

Electrolysis of Water Electrolytic Production of Chlorate Electrorefining of Copper Alkaline Battery Discharge Anodizing of Aluminum Cathodic Protection (Zinc Sacrificial Anode) Chlor-Alkali Electrolysis Chrome Electroplating Nickel-Metal Hydride Battery Electrochemical CO₂ Reduction to CO

Frequently Asked Questions

What is the equation for Lead-Acid Battery Discharge?
The balanced equation is: Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O.
What type of reaction is Lead-Acid Battery Discharge?
Lead-Acid Battery Discharge is a electrochemical reaction. It is reversible under certain conditions.
Is Lead-Acid Battery Discharge exothermic or endothermic?
Lead-Acid Battery Discharge is exothermic (releases energy). The enthalpy change (ΔH) is -359.0 kJ/mol.