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A bonded lead-carbon composite negative electrode

A lead-carbon composite and bonded technology, applied in the direction of lead-acid battery electrodes, structural parts, battery electrodes, etc., can solve the problems of poor mechanical strength of negative electrode active materials, affecting charge and discharge cycle life, and inconvenient addition, etc., to achieve Improved service life, small internal resistance and good stability

Active Publication Date: 2021-10-08
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is: in order to overcome the limitation of the amount of carbon material added in the existing lead-carbon composite negative electrode, the addition is inconvenient and the uniformity of dispersion is poor, and the mechanical strength of the negative electrode active material becomes worse after adding carbon material, which affects its charge and discharge. In view of shortcomings such as cycle life, a lead-carbon composite negative electrode that organically combines the lead negative electrode and the carbon negative electrode is proposed. On the premise of keeping the structure of the active material of the negative electrode unchanged, it can adjust the amount of capacitive material added in a wider range. Electrode Manufacturing Approach

Method used

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  • A bonded lead-carbon composite negative electrode
  • A bonded lead-carbon composite negative electrode
  • A bonded lead-carbon composite negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Combining figure 1 , figure 2 and image 3As shown, the lead-carbon composite negative plate of this embodiment has a size of 68mm×44mm×3.0mm, and its specific composition and manufacturing method are as follows: evenly coat the lead-carbon composite material 12 on the current collector 11 (ie, the negative electrode grid). , and then repeated surface drying and rolling to form a dense material structure, and then secondary curing, that is, continuous curing for 12 hours at a temperature of 60°C and a humidity of 85%; then at 60°C and a humidity of less than 50% Next, continue to dry the negative plate for 24 hours. Such as Figure 4 As shown, in the finished lead-carbon composite negative electrode, in the negative electrode lead paste powder (active material) 121, carbon material 122 exists in an embedded manner.

[0037] The size of the current collector 11 is: 67mm×43mm×1.7mm, and it is made of a lead-calcium-tin alloy with a calcium content of 0.09%...

Embodiment 2

[0047] Embodiment 2: The lead-carbon composite material 12 is made up of negative electrode lead paste powder 121, carbon material 122 and water-soluble binder prepared through semi-curing and drying, and their respective mass percentages are: negative electrode lead paste powder Material 97.5%, carbon material 0.5%, polyvinyl alcohol 2%, among them, carbon material is activated carbon powder (commercialized product), parameter index: specific surface area 1500m 2 / g, mesoporosity greater than 40%, particle size 5 μm; its preparation method is: the negative electrode lead paste powder 121 that is prepared through semi-curing, add carbon material 122, water-soluble binder and appropriate amount of deionized water, use planetary The mixer mixes evenly to make an apparent density of 3.9g / cm 3 mortar material.

[0048] In the present invention, the semi-cured negative electrode lead paste powder 121 is to press the prepared negative electrode lead paste into a strip with a thickn...

Embodiment 3

[0050] Embodiment 3: The described lead-carbon composite material 12 is made up of negative electrode lead paste powder 121, carbon material 122 and water-soluble binder prepared through semi-curing and drying, and their respective mass percentages are: negative electrode lead paste powder Material 87%, carbon material 8%, CMC (carboxymethyl cellulose) 2.5%, polyvinyl alcohol 2.5%. The preparation method is as follows: add carbon material 122, water-soluble binder and appropriate amount of deionized water to the negative electrode paste powder 121 prepared by semi-curing, and mix evenly with a planetary mixer to make an apparent density of 3.95g / cm 3 mortar material.

[0051] The carbon material is modified carbon particles prepared by adding conductive agent and binder to activated carbon, and the weight ratio of each component is as follows: 55% of activated carbon, 5% of carbon nanotubes, 5% of carbon nanofibers, 5% of carbon black %, graphite powder 15%, acetylene black...

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Abstract

The invention discloses a lead-carbon composite negative electrode, which includes a lead-carbon composite material and a current collector; the lead-carbon composite material is composed of 87-97.5% of semi-cured negative electrode lead paste powder, 0.5-8% of carbon material and binder 2 ~5% composition. The mortar-like lead-carbon composite material is evenly coated on the current collector, rolled repeatedly, and the surface is dried to form a dense material structure, and then secondarily cured and dried to form a raw electrode plate, and finally charged and formed to form a A composite electrode with a carbon intercalation structure is the lead-carbon composite negative electrode of the present invention. The carbon material is capacitive carbon powder or carbon particles prepared through modification of carbon powder; the binder is one or more of CMC (carboxymethyl cellulose), PVA (polyvinyl alcohol), starch and dextrin A mixture of more than two kinds; the current collector is the negative grid of lead storage battery. The lead-carbon composite negative electrode of the present invention has both high capacity and high power characteristics, and long cycle life.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices, and in particular relates to a novel lead-carbon composite negative electrode of a lead-carbon battery. Background technique [0002] With the continuous development of the economy, energy, resources and the environment have become the focus of society. Finding clean, renewable and resource-saving energy is an urgent and arduous task for human society. [0003] All kinds of lead-acid batteries are cost-effective, safe, easy to use and maintain, mature production technology and environmentally friendly, renewable, and are increasingly becoming the preferred batteries for various electric vehicles, communication power supplies and UPS power supplies. However, due to the limitations of the electrochemical system of the lead-acid battery, the mass density and power density of the battery are low, and the cycle life of the battery is low when used as a power battery, especially as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/14H01M4/20H01M4/21H01M4/22
CPCY02E60/10
Inventor 高建峰
Owner SUZHOU UNIV
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