Lead-Acid Battery Discharge

Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Lead Pb	1	(s)
Chất phản ứng	Sulfuric Acid H₂SO₄	2	(aq)
Sản phẩm	Water H₂O	2	(l)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

Lead-acid batteries represent a $45 billion global market. They are 99% recyclable and dominate automotive starting, UPS, and telecom backup.

Tính chất

Loại: Electrochemical
Thuận nghịch: Có
Năng lượng: Tỏa nhiệt
ΔH: -359,0 kJ/mol

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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.