Non-mercury septum paper for laminated cell

Abstract

The invention discloses a mercury-free diaphragm paper for a laminated cell, which is composed of a substrate and a coating, wherein, the coating is composed of a solid polymer electrolyte and bismuth chloride which is an inorganic mercury-substitute inhibiter; the solid polymer electrolyte is prepared by coordinated ionic liquid and PVA, PAM and starch; the coordinated ionic liquid is prepared by heating and melting urea, thiourea, zinc butter and ammonium chloride according to a certain proportion. The inorganic mercury-substitute inhibiter, bismuth chloride, in the coating of the invention can form a dense covering layer on the surface of a zinc electrode and form a good metallic film, thus realizing inhibition effect, reducing the discharge resistance of the battery and improving the capacity of the battery.

Description

technical field [0001] The invention relates to a mercury-free separator paper used in laminated batteries. Background technique [0002] The separator paper plays the role of isolating the positive and negative electrode materials in the battery, allowing the electrolyte to pass through, absorbing a certain amount of electrolyte, and maintaining the normal discharge of the battery. Diaphragm paper is composed of base paper and coating layer. In order to prolong the service life of the zinc cylinder, mercury chloride was added to the coating layer or added to the raw material of the battery cell as a corrosion inhibitor for the zinc electrode. The mechanism is that mercuric chloride undergoes a substitution reaction on the surface of zinc, and then further diffuses to the inner layer of zinc to form zinc amalgam, thereby improving the surface condition of zinc, increasing the superhydrogen potential of zinc, and playing a certain corrosion inhibition effect on the zinc cylin...

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Problems solved by technology

[0008] In the specification of this patent, it is recorded that the organic mercury substitute corrosion inhibitor is prepared according to the specification of Chinese patent ZL02123804.9. Organic mercury corrosion inhibitors, even if organic mercury corrosion inhibitors containing polyethylene glycol chain molecules are used to adsorb organic mercury corrosion inhibitors, there is still a small amount of organic mercury corrosion inhibitors adsorbed on the surface of zinc, which will still prevent the evolution of hydrogen and the discharge of the battery , increasing the discharge resistance of the battery

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