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An electrolyte additive for lead-acid batteries to suppress hydrogen evolution on negative plates

A technology for electrolyte additives and lead-acid batteries, applied in lead-acid batteries, secondary batteries, circuits, etc., can solve problems such as instability, limited solubility, negative electrode hydrogen evolution inhibition is not obvious, etc., to reduce water loss, operation Simple and convenient, improve the effect of hydrogen evolution overpotential

Inactive Publication Date: 2017-03-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such additives are easy to add, most of the additives are organic substances that are unstable in the electrolyte of lead-acid batteries and have limited solubility in the solution. The inhibition of hydrogen evolution at the negative electrode is not very obvious

Method used

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  • An electrolyte additive for lead-acid batteries to suppress hydrogen evolution on negative plates
  • An electrolyte additive for lead-acid batteries to suppress hydrogen evolution on negative plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare a negative plate containing 0.5% activated carbon, put it into 1.28g / cm 3 Soak in sulfuric acid solution for 24 hours. Then take the negative plate as the working electrode, take the positive plate produced by the factory as the counter electrode, Hg / Hg 2 SO 4 The electrode is a reference electrode, 1.28g / cm 3 The sulfuric acid solution is used as the electrolyte to form a three-electrode system. The working electrode was polarized with a cathodic current of 10mA for 16h by the constant current polarization method, so that the active material in the negative plate was completely converted into lead, and the gas dissolved in the solution around the negative plate was removed by overcharging. , 7mA, 6mA, 5mA, 3mA, 2mA current constant current polarization for 2h, after the polarization potential φ is stable, use a foam flowmeter to measure the amount of gas evolution, calculate the hydrogen evolution current I, take the average value of multiple measurements, a...

Embodiment 2

[0034]Prepare negative plates containing different carbon materials first, and put them into 1.28g / cm 3 Soak in sulfuric acid solution for 24 hours. Then take the negative plate as the working electrode, take the positive plate produced by the factory as the counter electrode, Hg / Hg 2 SO 4 The electrode is a reference electrode, 1.28g / cm 3 The sulfuric acid solution is used as the electrolyte to form a three-electrode system. The working electrode was polarized with a cathodic current of 10mA for 16h by the constant current polarization method, so that the active material in the negative plate was completely converted into lead, and the gas dissolved in the solution around the negative plate was removed by overcharging. , 7mA, 6mA, 5mA, 3mA, and 2mA current constant current polarization for 2h each, after the polarization potential φ is stable, use a foam flowmeter to measure the amount of gas evolution, calculate the hydrogen evolution current I, take the average value of ...

Embodiment 3

[0037] Additive of the present invention is applied to actual battery and carries out the impact of life cycle on water consumption: at first get two unformed 12V12Ah valve-regulated lead-acid batteries (the carbon material added in the negative plate is acetylene black), respectively marked as No. 1 ( Blank control battery), No. 2 (experimental battery). Add conventional lead-acid battery electrolyte to No. 1 battery, and add 0.025% Dy to the No. 2 battery electrolyte on the basis of No. 1 battery electrolyte 2 o 3 and 0.025% PTFE, the electrolyte is ultrasonically dispersed and added to the battery. Then the two batteries are internalized according to the same procedure. After the formation is completed, weigh and record the original weight of the battery, and then perform the water loss test in a cycle according to the same procedure. Weigh the battery and calculate the water loss at regular intervals, such as figure 2 As shown, the experiment shows that the water loss...

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Abstract

The invention discloses an electrolyte additive for inhibiting hydrogen evolution of a negative plate for a lead-acid storage battery and a using method and application of the electrolyte additive. The additive is one or two of a rare earth compound and a fluorine-containing polymer, and the adding amount of the additive is 0.01-0.1 percent of the mass of a sulfuric acid solution. According to the electrolyte additive, the hydrogen evolution overpotential of the negative plate of different carbon-containing materials can be effectively improved, the hydrogen evolution rate is reduced, and the water loss of the battery is decreased, so that the performance of the lead-acid storage battery is improved, and the service life of the battery is prolonged. The electrolyte additive is suitable for a valve control type lead-acid storage battery and a flooded lead-acid storage battery which are produced by adopting a large quantity of carbon negative plates.

Description

technical field [0001] The invention belongs to the technical field of battery electrolyte additives, and in particular relates to an electrolyte additive for lead-acid batteries to suppress hydrogen evolution on a negative plate and its use method and application. Background technique [0002] Lead-acid batteries are often cycled under high-rate partial charge state (HRPSoC) during the driving of hybrid electric vehicles, which easily leads to sulfation of the negative plate. In order to suppress this phenomenon, it is necessary to add a large amount of carbon additives to the negative plate. Carbon materials The addition of lead sulfate can make the lead sulfate evenly distributed in the plate. Carbon with a high specific surface area can not only reduce the current density during charging and discharging, but also form a conductive network inside the plate, which is conducive to the transfer of electrons and improves charging efficiency. However, since the hydrogen evolu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/08
CPCH01M10/08H01M10/121Y02E60/10
Inventor 郭永榔胡景城
Owner FUZHOU UNIV
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