Negative lead paste for lead carbon battery and negative plate

Abstract

The invention discloses negative lead paste for a lead carbon battery and a negative plate. The negative lead paste for the lead carbon battery is prepared from the following raw materials in parts byweight: 100 parts of ball-milled lead powder, 0.5-10 parts of a modified carbon material of high specific surface area, 0.05-5 parts of short carbon fibers, 0.05-0.5 part of Phosmer PE, 0.5-3 parts of superfine barium sulfate, 0.5-2 parts of lignin sulfonate, 0.5-2 parts of humic acid as well as water accounting for 10-20% of the mass of the lead powder and sulfuric acid aqueous solution accounting for 10-15% of the mass of the ball-milled lead powder. The preparation method comprises the following steps: uniformly coating the negative lead paste on a negative grid, spraying dilute sulfuric acid of 1.0-1.2mol / L on the surface of the negative grid coated with the negative lead paste, putting the negative grid coated with the negative lead paste and sprayed with the dilute sulfuric acid under conditions of 45-70 DEG C and relative humidity of 85-99% for curing for 36-60 hours, taking the grid as a negative plate after curing, and putting the negative plate into electrolyte for formation, thereby obtaining the finished negative plate of the lead carbon battery after formation. The battery made by the plate disclosed by the invention has the advantages of being high in hydrogen evolution over-potential, long in cycle life and the like.

Description

technical field [0001] The invention belongs to the technical field of lead-carbon batteries, and particularly relates to a negative electrode lead paste, a negative electrode plate and a preparation method thereof for a lead-carbon battery. Background technique [0002] In recent years, petrochemical resources have become increasingly scarce and environmental protection pressure has gradually increased. The development of renewable energy such as electric vehicles and solar wind energy is the general trend. There are many options for batteries used in electric vehicles and solar wind energy systems. Lead-carbon batteries are showing great potential due to the advantages of easy availability of raw materials, low cost, and perfect recycling system. However, due to the addition of a large amount of ordinary carbon materials, traditional lead-carbon batteries face serious hydrogen evolution problems in the later stage of charging, resulting in serious water loss of the battery...

AI Technical Summary

Problems solved by technology

However, due to the addition of a large amount of ordinary carbon materials, the traditional lead-carbon batteries face serious hydrogen evolution problems in the later stage of charging, resulting in severe water loss of the battery, resulting in a sharp shortening of battery life; in addition, the density difference between traditional carbon materials and active materials is too large , leading to uneven dispersion of carbon materials in the paste process, which affects the current distribution on the substrate, thereby affecting the utilization of active materials; finally, the strength of the negative plate is greatly reduced after adding a large amount of carbon materials, and the active materials and carbon materials are in the process of circulation. Powdering, falling off, and the accumulation of falling off substances to a certain extent will lead to the conduction of the positive and negative electrodes of the battery, resulting in a short circuit, especially in the process of charging and discharging with high current.