Surface grafting modifier for mh-ni battery diaphragm

Abstract

The invention discloses a surface grafting modifier for an mh-ni battery diaphragm. The formula of the surface grafting modifier comprises acrylic acid, deionized water, acetone, benzophenone, lignosulfonate and iso-tridecanol polyoxyethylene ether. The components comprise, by weight, 10-20 parts of acrylic acid, 60-65 parts of deionized water, 30-40 parts of acetone, 0.25-0.5 part of benzophenone, 0.05-0.1 part of lignosulfonate, and 0.5-0.8 part of iso-tridecanol polyoxyethylene ether, wherein the purity of acetone is 99.5-100%, and the purity of benzophenone and the purity of lignosulfonateare 99.7-100%. Through the adding of the lignosulfonate, the ion exchange capacity of the modified battery diaphragm is improved, the performance of the mh-ni battery is enhanced, meanwhile, the iso-tridecanol polyoxyethylene ether is added, the permeability of the modifier is improved, the hydrophilicity of the battery diaphragm grafted and modified by the modifier is greatly enhanced, the internal resistance of the battery is reduced, the energy consumption inside the battery is reduced, and the efficiency of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of modifiers, in particular to a surface graft modifier for mh-ni battery separators. Background technique [0002] Grafting refers to the reaction in which appropriate branches or functional side groups are combined on the macromolecular chain through chemical bonds. The formed product is called a graft copolymer. The performance of the graft copolymer depends on the composition of the main chain and the branch chain. , structure, length and number of branched chains, polymer graft modification has become a simple and effective method to expand the application field of polymers and improve the properties of polymer materials. [0003] The battery separator usually adopts PP microporous membrane. Although PP microporous membrane has strong mechanical strength, it also has strong hydrophobicity, which increases the internal resistance of the battery. Therefore, graft modification is needed to increase the hyd...

AI Technical Summary

Problems solved by technology

[0003] The battery separator usually adopts PP microporous membrane. Although PP microporous membrane has strong mechanical strength, it also has strong hydrophobicity, which increases the internal resistance of the battery. Therefore, graft modification is needed to increase the hydrophilicity of the separator. , the modifier is essential in the process of surface graft modification, the general modifier will cause the clogging of the PP microporous membrane while increasing the hydrophilic performance of the diaphragm, thereby reducing the ion exchange capacity , which reduces the performance of the battery, and the modifier is usually mixed with a variety of ingredients. If the ingredients cannot be mixed uniformly, uneven grafting on the surface of the PP microporous membrane will occur.