Determination method for lignosulfonic acid sodium salt capacity for resisting to electrochemical oxidation

Abstract

The invention discloses a determination method for lignosulfonic acid sodium salt capacity for resisting to electrochemical oxidation. The determination method includes the following steps that a lignosulfonic acid sodium salt to be determined is dissolved in pure water, wherein the mass of the lignosulfonic acid sodium salt is M; an ultrafilter is used for separating and collecting a solution which does not pass through an ultrafiltration membrane; the solution is dried; the dried sample is dissolved in a sodium hydroxide solution of 0.1 mol / L-0.2 mol / L, and then sulfuric acid of 1.28 ml-1.34 ml is added into the solution and mixed evenly; a prepared solution is contained into an electrolytic tank with a PbO2 membrane type electrode being an anode and pure lead foil being a cathode, and the solution is electrolyzed; after electrolysis, filtering is performed, and a gel filtration chromatography device with a differential refraction detector and an ultraviolet spectrum detector is adopted for measuring the electrolyzed solution.

Description

[0001] Technical field: [0002] The invention relates to a test method for lead-acid battery additives, in particular to a method for measuring the electrochemical oxidation resistance of sodium lignosulfonate. technical background: [0003] Low-temperature performance is one of the most important properties of lead-acid batteries. As an additive to the negative plate, lignin can be adsorbed on the lead electrode, and it can effectively prevent the surface of the negative plate from shrinking in a low-temperature environment. Su has a great relationship. [0004] Once the lignin is deactivated, the low-temperature performance of the battery electrode will drop rapidly during the cycle, and one of the reasons for the deactivation of the lignin is that the lignin dissolves in the electrolyte, causing it to migrate to the positive electrode and be oxidized. Due to different production raw materials, processing technology and post-processing methods, there are large differe...

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Problems solved by technology

[0004]Once lignin is deactivated, the low-temperature performance of the battery electrode will drop rapidly during cycling, and one of the reasons for lignin deactivation is lignin in the electrolyte Dissolution occurs, causing it to migrate to the positive electrode and be oxidized. Due to the difference in lignin production raw materials, processing technology, and post-treatment methods, there are large differences in the purity, oxidation resistance, and molecular size of lignin on the market. Therefore, the determination of lignin The electrochemical oxidation resistance of lignin in the battery helps consumers choose high-quality lignin, and the prior art lacks a method for measuring the electrochemical oxidation resistance of lignin