A kind of battery colloidal electrolyte and preparation method thereof

Abstract

The invention discloses a battery colloidal electrolyte and a preparation method thereof. The electrolyte includes sulfuric acid and nano gas-phase silicon dioxide, and it is added with a weight percentage of 1-3% to improve the dispersion of nano gas-phase silicon dioxide. active electrolyte additives. The additive is pentaerythritol. The particle size of the fumed silica is 10±2 nanometers. The weight percentage of the nano fumed silicon dioxide and sulfuric acid is 1:7-7.5. The electrochemical performance of colloidal electrolytes prepared using shorter dispersion times in the presence of this additive was comparable to that of colloidal electrolytes dispersed for 90 min in the absence of additives, with increased dispersion times for fumed silica Or shortening will not lead to a decrease in the electrochemical performance of the electrolyte. The preparation cost of the electrolyte is reduced, the preparation efficiency is high, and the electrochemical performance of the electrolyte prepared by the method is stable.

Description

technical field [0001] The invention relates to an electrolyte used in a valve-controlled sealed lead-acid battery and a preparation method thereof. Background technique [0002] Valve-regulated sealed gel batteries have become the first choice for energy storage batteries due to their advantages such as small self-discharge, stable performance, good cycle performance, wide range of temperature applications, resistance to overcharge and overdischarge. The performance of gel battery depends largely on the performance of gel electrolyte. In the early preparation of colloidal electrolytes, silica sol was mainly used. However, due to its shortcomings such as large impurity content and weak gelling ability, the prepared colloids are prone to hydration, aging, dryness and hardening, cracking and delamination, and lose their original properties. Some colloidal properties shorten the service life of the battery. Later, the performance of colloidal batteries made of nano fumed sili...

AI Technical Summary

Problems solved by technology

Studies have shown that using fumed silica with uniform particle size to prepare colloidal electrolyte has better cycle performance. Fumed silica with uniform particle size has a high specific surface area, and its gel force is particularly strong, which requires very high requirements for dispersion equipment. , fumed silica with a uniform particle size distribution and about 10 nanometers needs to be dispersed at a high speed (2000-4000rpm) at a better dispersion temperature for 80-90 minutes to form a gel electrolyte with good thixotropy (see Publication No. CN101246968 patent), but such dispersed requirements are very difficult for storage battery manufacturers

and the cost is very high

Experiments have shown that if the dispersion time is shortened without any additives, the electrode capacity of the colloidal electrolyte will be greatly reduced, the resistance of the colloidal electrolyte will be greatly increased, and the prepared colloidal electrolyte has a larger viscosity and a very short gel time. It leads to the difficulty of filling the glue, and often makes the filling of the electrolyte unable to proceed normally, which limits the popularization and application of this type of colloid.

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