A long-life positive lead paste for lead-acid batteries containing stannous sulfate and a method for producing the same
By coating stannous sulfate microparticles with mesoporous SiO2 and using a citric acid-tartaric acid dual-ligand complex system, combined with a nitrogen-protected spray injection process, the dispersion and oxidation problems of stannous sulfate in lead paste preparation were solved. This enabled the preparation of lead-acid battery positive electrode lead paste with high cycle life and low cost, and improved the structural stability and performance consistency of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIESHOU HUAYU POWER SUPPLY
- Filing Date
- 2026-05-29
- Publication Date
- 2026-07-17
AI Technical Summary
Existing cathode lead paste technology containing stannous sulfate lacks systematic optimization in terms of additive synergistic design, effective dispersion and stable introduction of stannous sulfate, and paste mixing process and microstructure control. This results in poor lead paste dispersibility, difficulty in controlling batch consistency, short cycle life, and high cost.
A mesoporous SiO2-coated stannous sulfate microparticle and citric acid-tartaric acid dual-ligand complex system is adopted, combined with a nitrogen-protected spray injection process. The mesoporous structure isolates stannous sulfate from water or dilute sulfuric acid, controls the release and distribution of Sn2+, forms a stable complex, and ensures uniform doping and crystal formation.
It significantly improves the formation quality and distribution uniformity of the 4BS phase in the positive electrode lead paste, extends the deep cycle life of the battery, improves the reliability of the battery, and achieves a good balance between raw material cost and process compatibility.
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