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Lead carbon compound material as well as preparation method and application thereof

A composite material, lead-carbon technology, applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve the problems of difficult preparation of lead powder particles, difficulty in uniform mixing, high process cost, etc., to avoid low utilization rate and specific surface area. Controlled, enhanced conductivity effects

Inactive Publication Date: 2016-10-05
厦门百美特生物材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 1) the specific gravity difference between the carbon material and the lead powder is too large, and it is extremely difficult to mix evenly; 2) the lead and the sulfuric acid in the electrolyte react to form lead sulfate, which will further prevent the reaction of lead and sulfuric acid inside the lead powder, resulting in the inability to obtain active materials. Effective utilization, but the preparation of lead powder particles with high specific surface area is very difficult and the process cost is high; 3) The firm combination of lead powder and carbon material interface requires more binders, and the increase in the proportion of binders will lead to The pore closure of more carbon materials has a negative impact on the improvement of key indicators such as energy density, power density, high current characteristics, and capacitance effects.
4) Since the carbon material and lead powder cannot be mixed uniformly, with the increase of the amount of carbon material used, hydrogen evolution and lead sulfate crystallization will be more serious, seriously affecting the service life of lead-carbon batteries. The current theoretical research, the addition of carbon material Amount not greater than 2wt% is a good choice, which limits the supercapacitive characteristics
After consulting public literature, patents, reports, etc., there is a lack of information on the preparation and application of lead alginate, especially the use of lead alginate to prepare active materials for lead-carbon batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Put calcium alginate short fibers with a fineness of 2.2dtex (dtex) and a length of 60mm into a sufficient amount of lead acetate aqueous solution at room temperature, stir for 30 minutes to perform sufficient ion exchange, and then filter dry to remove Repeated rinsing with deionized water and drying with hot air to obtain lead alginate fibers;

[0035] 2) Dry the lead alginate fiber thoroughly in a vacuum drying oven at 120°C; place the dried lead alginate fiber in a high-temperature carbonization furnace, first raise the temperature to 240°C at a heating rate of 5°C / min, and keep it warm for 6 hours. Then naturally cool down to room temperature, complete high-temperature carbonization, and pulverize into particles with D90=16 μm to obtain the lead-carbon composite material.

[0036] After testing, the specific surface area of ​​the prepared lead-carbon composite material is 1240m 3 / g, wherein the total content of lead and carbon is 89.7%, and the mass ratio of lea...

Embodiment 2

[0038] 1) Add 67.5g of conductive carbon black into 477.5 liters of pure water under stirring and disperse it into a suspension, then add 22.5kg of sodium alginate, stir and dissolve, and prepare spinning stock solution; be 6% lead acetate The solution is a coagulation liquid, and the known alginate fiber wet spinning process is used to prepare a conductivity-enhanced lead alginate fiber with a fineness of 3.3 dtex, a fineness of 17.6 μm, and 0.25 wt % conductive carbon black.

[0039] 2) After the prepared fibers were thoroughly dried in a vacuum drying oven at 120°C, they were placed in a high-temperature carbonization furnace, and the temperature was first raised to 240°C at a heating rate of 5°C / min, kept for 6 hours, and then cooled down to room temperature naturally. After the high-temperature carbonization is completed, it is pulverized into particles with D90=16 μm to obtain the conductive-enhanced lead-carbon composite material.

[0040] After testing, the specific su...

Embodiment 3

[0042] 1) Add 200-mesh alginic acid particles into a sufficient amount of lead acetate aqueous solution at room temperature, stir for 30 minutes to perform sufficient ion exchange, then filter out, rinse repeatedly with deionized water, and dry to obtain lead alginate particles;

[0043] 2) Pre-dry the lead alginate in a vacuum drying oven at 60°C; then thoroughly dry it in a vacuum drying oven at 115°C and place it in a carbonization furnace, first raise the temperature to 260°C at a heating rate of 5°C / min, Keep it warm for 4 hours, then cool it down to room temperature naturally, and complete high-temperature carbonization to obtain the lead-carbon composite material.

[0044] After testing, the specific surface area of ​​the prepared lead-carbon composite material is 4.7m 3 / g, wherein the total content of lead and carbon is 91.4%, and the mass ratio of lead and carbon is 0.895:1, which can be used as the positive electrode material of lead-carbon battery.

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Abstract

The invention discloses a lead carbon compound material as well as a preparation method and application thereof. The preparation method comprises the following steps of: adding alginic acid or alginate into a lead saline solution, thereby preparing lead alginate; carbonizing the lead alginate in a carbide furnace at a high temperature, thereby preparing a lead carbon compound material with a three-dimensional cellular structure and specific area of 1-3000m<3> / g; uniformly mixing lead with carbon, wherein the total content of lead and carbon is not less than 70% and the mass ratio of lead to carbon is (0.6-1.5):1. The lead carbon compound material can be used for further preparing anode and cathode materials of a lead carbon battery.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a lead-carbon composite material and a preparation method and application thereof. Background technique [0002] The field of new energy is inseparable from high-performance energy storage devices. As an important energy storage device, rechargeable batteries are required to have high specific capacity, energy density, power density, cycle times, safety, low leakage current and low internal resistance, etc., as well as low cost and low price. [0003] Lead-carbon batteries have the characteristics of both lead-acid batteries and supercapacitors. They are rich in raw materials, low in price, easy to recycle, and safe to use. They are gradually replacing lead-acid batteries. and other fields have been widely used. [0004] Lead-carbon negative electrode materials are made of carbon materials such as activated carbon, graphite and graphite-like, graphene, carbon nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/56H01M4/583H01M4/57H01M4/04H01M4/133H01M4/134
CPCH01M4/04H01M4/133H01M4/134H01M4/56H01M4/57H01M4/583Y02E60/10
Inventor 刘松林
Owner 厦门百美特生物材料科技有限公司
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