Xanthan gum gel electrolyte and preparation method thereof

Abstract

The invention provides a xanthan gum gel electrolyte and a preparation method thereof. Sulfuric acid is added to anhydrous sodium sulfate to be stirred and dissolved to obtain a sulfuric acid solutionof anhydrous sodium sulfate; and next, xanthan gum is added to the solution to be stirred and mixed to obtain a xanthan gum gel electrolyte, wherein the added anhydrous sodium sulfate accounts for 0.02-0.05mass% of the total mass of sulfuric acid, and the added xanthan gum accounts for 0.7-1.2mass% of the total mass of sulfuric acid. The xanthan gum gel electrolyte disclosed in the invention hasan extra reagent, so that types of reagents are obviously reduced, influence to the environment is lowered, and production cost is highly lowered; on the basis, the gel electrolyte with high dispersity, almost no change of viscosity along with time and relatively high index performance is prepared, and the cycle life of the prepared gel electrolyte is obviously prolonged; and therefore, the gel electrolyte has relatively high application prospects.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry. The invention relates to a xanthan gum colloidal electrolyte and a preparation method thereof, that is, to a battery colloid electrolyte added with xanthan gum and a preparation method thereof. technical background [0002] The colloidal electrolyte used in colloidal batteries can form a solid protective layer around the plates to protect the plates from damage and rupture due to vibration or collision, prevent the plates from being corroded, and also reduce the generation of batteries when they are used under heavy load. The bending of the plates and the short circuit between the plates will not lead to a decrease in capacity, and has good physical and chemical protection, which is twice the life of ordinary lead-acid batteries; colloidal batteries are characterized by their high quality and long cycle life. It is widely used in the field of electrochemical technology. [0003] In the...

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Problems solved by technology

[0003] In the early preparation of colloidal electrolyte, silica sol was mainly used as the gelling agent. When silica sol was used as the gelling agent, the colloidal electrolyte prepared had weak gelling ability, high impurity content, and the disadvantages of hydration layering on the colloidal electrolyte. The prepared colloid is easy to hydrate, age, dry and hard, crack and delaminate, and lose the original colloidal characteristics, resulting in low capacity and short life of the prepared battery

In recent years, a large number of studies have found that fumed silica is easy to disperse and can form colloids with good thixotropic properties. Therefore, colloidal batteries prepared by fumed silica method have excellent performance; but in the process, the smaller the particle size and the more the distribution The stronger the gel ability of homogeneous fumed silica, but the more difficult it is to disperse, and if the dispersion is insufficient, it will lead to defects such as short gelation time, difficult perfusion, and small capacitance of the prepared colloidal electrolyte.

In the patent application documents with publication numbers "CN1503393A", "CN2598159Y", and "CN101246968A", it is mentioned that the use of nano fumed silica with a matching size and particle size instead of silica with a small particle size and uniform distribution can relatively improve the efficiency of colloidal electrolysis. The dispersibility of the liquid, but at the same time also reduces the gel ability and the uniformity of distribution; mentioned in the patent application document with the publication number "CN101246968", the use of fumed silica with a uniform particle size distribution and a particle size of about 10nm The obtained colloidal electrolyte has better cycle stability, but in the preparation process, it needs to be dispersed at a high speed (2000-4000r / min) at a better dispersion temperature for 80-90 minutes to form a colloidal electrolyte with better thixotropy. Moreover, Due to its small particle size, high specific surface area and particularly strong coagulation force, the requirements for dispersion equipment are very high; in the patent application document with the publication number "CN101771170A", it is mentioned that the dispersion of fumed silica can be improved by adding pentaerythritol properties, and the obtained colloidal electrolyte has better gelling ability, but the increase of raw materials in this process not only increases the production cost, but also the chemical substances used in the preparation process have a certain impact on the environment and the human body. During the use of colloidal electrolyte It will also have a certain impact on the colloidal electrolyte

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