The invention discloses a method for preparing a negative grid of a lead storage battery, which belongs to the technical field of
electrode material preparation. In the method, a
lead alloy is used as a
raw material, a negative grid formed by pouring molten
lead alloy serves as a
cathode, a cathodic electrochemical reduction technology is used to perform
surface modification in
aqueous solution of a
rare earth sulfate and
sulfuric acid,
rare earth is used to improve the performance of the surface of the
lead alloy negative grid, and thus, the lead storage battery negative grid with a
rare earth-modified lead
alloy surface is formed. The method avoids the difficulty in the preparation of a rare earth-lead (Pb-Re)
alloy, can dope some trace rare earth elements on the surface of an electrodeeasily, uniformly and quantitatively and realize the adjustment of the surface performance of the
electrode. The preparation of a rare earth
oxide by an electrochemical method has the advantages of ensuring the high purity of the prepared rare earth
oxide, making the domain structure of the rare earth
oxide adjustable, along with mild operation conditions, simple operation, low preparation cost and the like, and thus, conditions are provided for process industrialization. In the invention, the preparation method is simple, the preparation is convenient and the process is safe and reliable.