A kind of graphene lead-carbon power battery and manufacturing method thereof

Abstract

The present invention provides a graphene lead-carbon power battery, comprising a shell and an inner core, the inner core is composed of a positive composite pole plate, a diaphragm, and a negative composite pole plate arranged in sequence, the positive composite pole plate, the negative composite pole The plates are respectively composed of a positive electrode plaster board, a negative electrode plaster board, and a grid coated on the positive electrode plaster board and the negative electrode plaster board, wherein the positive electrode plaster board is composed of lead oxide and graphene fibers , the negative electrode plaster board is composed of lead, graphene and conductive polymer, and the grid is composed of lead grid and graphene coated on the surface of the lead grid. The present invention provides a graphene lead-carbon power battery to improve the negative electrode "sulfation" phenomenon of traditional lead-acid batteries, and has the characteristics of long cycle life, high charge acceptance capacity, high specific power, and good low-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a graphene lead-carbon power battery and a manufacturing method thereof. Background technique [0002] Traditional lead-acid batteries use lead oxide coated on the surface of the grid as the active material of the positive electrode, lead coated on the surface of the grid as the active material of the negative electrode, and sulfuric acid solution as the electrolyte. Advantages, lead-acid batteries are widely used in electric bicycles, car start-stop, communications, industrial electronics, renewable energy, military industry and other fields, and occupy the highest share in the battery market. The output of lead-acid batteries in my country ranks first in the world, and Fujian Province is one of the main manufacturing clusters. The lead-acid battery industry has brought huge taxes to Fujian Province and created a large number of employment opportunities....

AI Technical Summary

Problems solved by technology

However, traditional lead-acid batteries have disadvantages such as low specific power, low specific energy, short cycle life and service life. Carbon materials such as black are mixed with lead as the active material of the negative electrode. The characteristics of supercapacitors are introduced into the lead-acid battery to enhance its specific power, and carbon materials are used to build a conductive network in the electrode to alleviate the problem of "sulfation" of the negative electrode.

However, the addition of carbon materials brings the following problems to the negative electrode: First, the large difference in tap density between lead powder and carbon material makes it difficult to mix the lead powder and carbon material uniformly, which will affect the stability of the negative electrode paste and reduce the Second, the hydrogen evolution potential on the surface of carbon materials is lower than that of lead. The addition of carbon materials will lead to increased hydrogen evolution at the negative electrode of the battery. Excessive hydrogen evolution will cause the battery to lose water and fail, affecting battery life.

Activated carbon has a microporous structure with a large specific surface area, high electric double layer capacity, but low conductivity, and activated carbon is not easy to modify and modify, and its functional modification is easy to block its micropores; graphite has the highest conductivity, However, the specific surface area is very small and cannot increase the capacitance characteristics of the electric double layer; acetylene black has good conductivity and can increase the porosity of the plate, but there are also disadvantages such as low specific surface area and difficult modification and modification.

It can be seen that due to the characteristics of structure and properties, these traditional carbon materials not only cannot effectively solve the problem of "sulfation" of traditional lead-acid batteries, but also bring new technical problems, and cannot give full play to the advantages of lead-carbon super batteries , which has also led to the fact that there are no mature products independently developed in China

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