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Positive electrode lead plaster of lead acid storage battery

A lead-acid battery, positive lead paste technology, applied in lead-acid batteries, battery electrodes, circuits, etc., can solve the problems of unstable ionic liquid properties, decomposition and oxidation, etc., to improve curing efficiency, high dispersion, and inhibit loss. Effect

Inactive Publication Date: 2015-04-01
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a positive lead paste for lead-acid batteries, which solves the problem that the ionic liquid in the existing lead paste is unstable and is easily decomposed and oxidized under high oxidation conditions

Method used

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  • Positive electrode lead plaster of lead acid storage battery
  • Positive electrode lead plaster of lead acid storage battery
  • Positive electrode lead plaster of lead acid storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Positive electrode paste formula, by weight percentage, consists of the following components: Shimadzu type lead powder 75%, lead oxide 5%, chemical fiber 0.1%, 1-ethyl-3-methylimidazole trifluoromethanesulfonate salt ([Emim]OTf) 0.1%, graphite 0.1%, high-purity water 10%, weight concentration of 50% sulfuric acid 9.7%.

[0029] According to the above formula and paste, accumulators were made according to the existing process, with no addition of 1-ethyl-3-methylimidazole triflate as a blank control, and the lead paste disclosed in Example 1 of CN102610823A as a comparative example . According to the traditional method of cycle life test, the results are as follows figure 1 Shown:

[0030] After 200 times of charge and discharge, the discharge time of the storage battery made of the lead paste of the present invention is obviously higher than that of the blank control and the comparative example. The life of the blank control and the comparative example is terminated...

Embodiment 2

[0032] Positive lead paste formula, by weight percentage, consists of the following components: Shimadzu type lead powder 85%, lead oxide 1%, chemical fiber 0.05%, 1-octyl-3-methylimidazole trifluoromethanesulfonate Salt ([Omim]OTf) 0.4%, graphite 0.5%, high-purity water 7%, weight concentration 6.05% of sulfuric acid 40-50%.

[0033] According to the above formula and paste, then make a microelectrode according to the traditional method, without adding 1-ethyl-3-methylimidazole trifluoromethanesulfonate as a blank control, and take the lead paste disclosed in Example 1 of CN102610823A as a comparative example . Using a three-electrode system to test the overpotential of hydrogen evolution and oxygen evolution, the results are as follows figure 2 Shown:

[0034] Compared with the blank control and the contrast ratio, the hydrogen evolution and oxygen evolution overpotential of the microelectrode made by the lead paste of Example 2 is significantly improved. Although the con...

Embodiment 3

[0036] Positive electrode paste formula, by weight percentage, consists of the following components: Shimadzu type lead powder 80%, lead oxide 2.5%, chemical fiber 0.1%, 1-butyl-3-methylimidazole trifluoromethanesulfonic acid 0.2% of salt ([Bmim]OTf), 0.2% of graphite, 9% of high-purity water, and 8% of sulfuric acid with a weight concentration of 40-50%.

[0037] According to the above formula and paste, and then assembled into a battery according to the traditional process, no addition of 1-ethyl-3-methylimidazolium triflate was used as a blank control, and the lead paste disclosed in Example 1 of CN102610823A was used as a comparative example. After the battery has been used for a period of time, the lead paste on the plate is taken out for scanning electron microscope testing, and the results are as follows: image 3 Shown:

[0038] The active material of the present invention maintains better porous structure and crystal form, and the formed lead sulfate crystals are sma...

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PUM

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Abstract

The invention discloses a positive electrode lead plaster of a lead acid storage battery. The positive electrode lead plaster comprises ionic liquid, wherein the ionic liquid is alkyl imidazole trifluoro-mesylate which can improve hydrogen evolution and oxygen evolution over-potential of active substances to further inhibit the loss of charging and discharging water and reduce battery failures caused by drying-up of water. The alkyl imidazole trifluoro-mesylate has relatively low surface tension, and can be well compatible with other substances to ensure that an inorganic material has a relatively high nucleation rate, therefore, by adding alkyl imidazole trifluoro-mesylate into the positive electrode lead plaster, the crystallization rate of lead sulfate in a discharging process can be improved, and the super-saturation degree of lead sulfate is reduced to ensure that loosened and porous lead sulfate is generated on the surface of a positive electrode plate.

Description

technical field [0001] The invention relates to the technical field of lead-acid batteries, in particular to a positive lead paste for lead-acid batteries. Background technique [0002] At present, lead-acid batteries have an absolute advantage in the market due to their advantages of low price, safety and reliability, and abundant raw materials, but their low power density and specific energy limit their application. Because the performance of lead-acid batteries (such as service life, etc.) mainly depends on the positive electrode, most of the existing research is focused on the improvement of the positive electrode, and the formulation of lead paste is the most important. In the prior art, additives are generally added to the lead paste to improve the utilization rate and cycle life of the positive electrode active material. For example, various carbon materials such as carbon black and graphite can effectively improve the conductivity of the active material and maintain...

Claims

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Application Information

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IPC IPC(8): H01M4/57
CPCH01M4/57H01M10/06Y02E60/10
Inventor 何文祥高根芳朱健代飞胡国柱
Owner TIANNENG BATTERY GROUP
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