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Lead-acid battery cathode and preparation method thereof

A lead-acid battery and negative electrode technology, applied in the field of lead-acid battery negative electrode and its preparation, can solve the problems of battery performance degradation, battery performance impact, battery damage, etc., achieve simple manufacturing process, good hydrogen evolution effect, and solve the effect of performance decline

Active Publication Date: 2013-01-23
MINHUA POWER SOURCE CO LTD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the negative electrode of lead-acid battery will generate a certain amount of hydrogen gas during the charging process, especially when the negative electrode of super lead-acid battery and lead-carbon battery contains a large amount of carbon materials, a large amount of hydrogen gas will be generated during the charging process, which seriously affects the battery life. performance
When ordinary lead-acid batteries are charged with a large current, a large amount of hydrogen gas will be generated at the negative electrode, which will lead to a decrease in battery performance and life, and even directly lead to battery damage and failure.

Method used

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  • Lead-acid battery cathode and preparation method thereof
  • Lead-acid battery cathode and preparation method thereof
  • Lead-acid battery cathode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This example shows the method for electrochemically modifying the surface of the negative plate of a common lead-acid battery and the surface morphology of the electrode.

[0028] Select ordinary lead-acid battery negative plate (cooked plate) for surface modification. The specific implementation method is as follows: the polypyrrole is synthesized at 0.8V by the constant potential method, and the platinum electrode and the saturated calomel electrode (SCE) are respectively used as the counter electrode and the reference electrode. The concentration of pyrrole in the electrolyte is 0.15M, and sodium p-toluenesulfonate is used as a dopant with a concentration of 0.2M. Scanning electron micrograph of the negative plate modified by 60s polypyrrole compared with the ordinary negative plate without modification (see figure 1 and figure 2 ) shows that the surface of the negative plate before modification is lead sponge, and the structure is relatively sparse. After modifi...

Embodiment 2

[0030] This example uses cyclic voltammetry to characterize the electrochemical properties of a new lead-acid battery negative electrode containing polypyrrole (0.5% graphite microflakes in the active material) obtained by electrochemical modification, and demonstrates the ability of polypyrrole film to inhibit hydrogen evolution Effect.

[0031] Research electrode manufacturing method for cyclic voltammetry performance test: a pure lead electrode with a diameter of 10mm, one end is welded with a copper wire, and the part immersed in the electrolyte is sealed with an insulating acid-resistant glue, and a drill is drilled on one side of the electrode plane. A circular hole with a diameter of 2.6mm, the depth of the lead surface from the insulating surface is 1mm, which is used to fill the active material (lead paste) under study, and the paste-coated electrode is made into a research electrode through curing, drying, chemical formation and other processes.

[0032] The preparat...

Embodiment 3

[0035] This example uses cyclic voltammetry to characterize the electrochemical properties of the lead-carbon battery negative electrode (containing 3.0% carbon black in the active material) obtained by the electrochemical modification method containing polypyrrole, and shows that the polypyrrole modified electrode inhibits the charging of the negative electrode. The effect of hydrogen evolution.

[0036] The same method as in Example 2 was used to fabricate and modify the research electrode. The difference is that 3.0% carbon black is added to the negative active material in the research electrode without adding graphite microflakes. The modified electrode and the unmodified electrode were tested for cyclic voltammetry performance, and the results were as follows: Figure 4 shown.

[0037]The results showed that the hydrogen evolution peak of the modified electrode around -1.7V was significantly lower, and the hydrogen evolution potential of the unmodified electrode was sig...

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Abstract

The invention relates to a lead-acid battery cathode and a preparation method thereof. The invention provides a lead-acid battery cathode with surface containing polypyrrole and a preparation method of the lead-acid battery cathode. The lead-acid battery cathode comprises a grid and an active material, wherein the grid comprises a Pb-Sb or Pb-Ca alloy, and the active material comprises the following components by weight percent: 30-98 percent of Pb, 0.5-20 percent of PbO, 0.1-15 percent of PbSO4, 0.05-30 percent of carbon black or graphite, 0.2-2 percent of barium sulfate, 0.2-2 percent of humic acid and 0.01-1 percent of short staple. The preparation method comprises an electrochemic modification method, a chemical polymerization deposition method and a dipping coating method. The lead-acid battery cathode can be applied to the improvement of the property of the conventional lead-acid battery cathode, and can also be applied to novel lead-acid battery systems such as a bipolar lead-acid battery, a gel battery, a tubular lead-acid battery, a super lead-acid battery and a lead-carbon battery.

Description

technical field [0001] The invention relates to a lead-acid battery negative pole, in particular to a lead-acid battery negative pole with polypyrrole on its surface and a preparation method thereof. Background technique [0002] Lead-acid battery has experienced more than 150 years of development since its invention, and its technology and theoretical research have become increasingly mature. In today's battery industry, lead-acid batteries still occupy a dominant position in terms of output and application fields, and maintain a strong vitality. With the development of new technologies, lead-acid batteries are facing severe challenges from other new chemical power sources. New requirements are also put forward for the performance of lead-acid batteries, such as: improving specific energy and cycle life, improving fast charging performance, etc. These are problems that need to be solved urgently to adapt to the new situation. [0003] However, the negative electrode of l...

Claims

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Application Information

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IPC IPC(8): H01M4/14H01M4/68H01M4/56H01M4/16
CPCY02E60/126Y02E60/10
Inventor 高军张焱杨勇黄建国谢旭东黄连清
Owner MINHUA POWER SOURCE CO LTD FUJIAN
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