CN111477978A

CN111477978A - Colloidal electrolyte suitable for partial charge state

Info

Publication number: CN111477978A
Application number: CN202010294364.0A
Authority: CN
Inventors: 钦晓峰; 周其明; 毛锦敏; 陆毅; 高洁; 孙长贵
Original assignee: Tianneng Battery Wuhu Co Ltd
Current assignee: Tianneng Battery Wuhu Co Ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2020-07-31

Abstract

The invention discloses a colloidal electrolyte suitable for a partial charge state, and relates to the technical field of battery production and manufacturing. The invention comprises the following components in percentage by weight: 33-37% of sulfuric acid and 0.5-0.6% of gas phase SiO₂0.8-0.9% of anhydrous Na₂SO₄0.0005-0.001% of a polybenzenamide, 0.05-0.1% of H₃PO₄And the balance being pure water. The invention adds the poly-styryl amide and H3PO into the hydrolysate₄And Na₂SO₄The electrolyte is stirred by utilizing the density change of the electrolyte when the battery shakes or is charged and discharged, so that the electrolyte layering is relieved, the sulfation at the bottom of the battery is reduced, and the service life is prolonged.

Description

Colloidal electrolyte suitable for partial charge state

Technical Field

The invention belongs to the technical field of soft battery production and manufacturing, and particularly relates to a colloid electrolyte suitable for a partial charge state.

Background

The electrolyte is a medium (having a certain corrosiveness) used in chemical batteries, electrolytic capacitors, and the like. The existing electrolyte is more and more applied when the energy storage battery is in a partial charge state (PSOC), and the electrolyte in the partial charge state (PSOC) is not fully charged and is not discharged, so that the electrolyte in the state loses the probability of stirring the electrolyte by hydrogen and oxygen generated by overcharge, and the electrolyte layering cannot be spontaneously solved. After the electrolyte is layered, the potentials of the upper part and the lower part of the polar plate are different due to different concentrations, so that a micro battery is formed, the lower polar plate discharges to generate more lead sulfate, and the capacity, the starting performance and the cycle life of the battery can be reduced after long-term circulation.

Disclosure of Invention

The invention aims to provide a colloidal electrolyte suitable for a partial charge state so as to solve the problem of the layering phenomenon of the electrolyte proposed by the background art.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a colloid electrolyte suitable for a partial charge state, which comprises the following components in percentage by weight: 33-37% of sulfuric acid and 0.5-0.6% of gas phase SiO₂0.8-0.9% of anhydrous Na₂SO₄0.0005-0.001% of a polybenzenamide, 0.05-0.1% of H₃PO₄And the balance being pure water.

Further, the paint comprises the following components in percentage by weight:

35-36% of sulfuric acid and 0.55-0.57% of gas phase SiO₂0.85-0.87% of anhydrous Na₂SO₄0.00075-0.0008% of polybenzene amide and 0.075-0.08% of H₃PO₄And the balance being pure water.

Further, the gas phase SiO₂Selecting the material with the specific surface area of 300m²(ii) hydrophilic fumed silica per gram.

The invention has the following beneficial effects:

the invention adds the poly-styryl amide and H3PO into the hydrolysate₄And Na₂SO₄The electrolyte is stirred by utilizing the density change of the electrolyte when the battery shakes or is charged and discharged, so that the electrolyte layering is relieved, and the sulfur at the bottom of the battery is reducedSalinization and service life improvement.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Detailed Description

Example one

A colloid electrolyte suitable for a partial charge state comprises the following components in percentage by weight: 35% sulfuric acid, 0.55% gas phase SiO₂0.85% anhydrous Na₂SO₄0.00075% of a polybenzenamide, 0.075% of H₃PO₄And the balance being pure water.

Example two

A colloid electrolyte suitable for a partial charge state comprises the following components in percentage by weight: 33% sulfuric acid, 0.6% gas phase SiO₂0.8% of anhydrous Na₂SO₄0.001% of a polybenzenamide, 0.05% of H₃PO₄And the balance being pure water.

EXAMPLE III

A colloid electrolyte suitable for a partial charge state comprises the following components in percentage by weight: 37% sulfuric acid, 0.5% gas phase SiO₂0.9% anhydrous Na₂SO₄0.0005% of a polybenzenamide, 0.1% of H₃PO₄And the balance being pure water.

Comparative example;

an electrolyte prepared from Chinese patent No. CN103972591A

The electrolytes obtained in the above examples 1 to 3 and comparative example were used for battery production, and the performance of the batteries was measured, and the results were as follows:

item	Example one	Example two	EXAMPLE III	Comparative example
					Average cycle life	375	379	371	349
Discharge time min	134	133	135	128
					Capacity retention rate	0.94	0.93	0.92	0.82

The average cycle life of the electrolyte battery is 375 times, the cycle is improved by about 25 times compared with the conventional comparative battery, the integral early-stage cycle trend is stable, the integral discharge time is over 130min, the capacity retention rate is 0.93C, and the national standard requirement is met. Meanwhile, the deviation of the upper, middle and lower densities of the electrolyte is less than 0.02 percent

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The colloid electrolyte suitable for the partial charge state is characterized by comprising the following components in percentage by weight: 33-37% of sulfuric acid and 0.5-0.6% of gas phase SiO₂0.8-0.9% of anhydrous Na₂SO₄0.0005-0.001% of a polybenzenamide, 0.05-0.1% of H₃PO₄And the balance being pure water.

2. The colloidal electrolyte solution of claim 1, wherein the colloidal electrolyte solution comprises the following components in percentage by weight:

3. The colloidal electrolyte of claim 1 or 2, wherein the gas phase SiO is in the form of a gas₂Selecting the material with the specific surface area of 300m²(ii) hydrophilic fumed silica per gram.