Preparation method of conductive carbon material with hierarchical porous structure, and pole plate for lead acid battery

A lead-acid battery and multi-level pore technology, applied in the field of materials science, can solve the problems of large differences in the properties of carbon materials, complex purity and preparation processes, and low carbon content in water loss, so as to increase the loading of active materials and ensure fast The effect of smooth transmission and improved cycle life

Inactive Publication Date: 2017-05-31
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Description
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Problems solved by technology

[0005] However, due to the large differences in the properties of different types of carbon materials, such as specific surface area, electrical conductivity, surface functional group type, abundance, and intercalation chemical properties, the effects of different carbon materials as negative electrode additives are very different. Increased rate isn't the only reason for improved battery performance
In addition, due to the wide potential range of the lead-acid battery, the high specific surface carbon material in the electrode may have side reactions, generate carbon dioxide, carbon monoxide and other products and consume a large amount of water in the electrolyte, resulting in a decrease in battery performance
In addition, the high cost of carbon materials, the choice of carbon sources (acetylene black, graphite, activated carbon, and a mixture of the two), purity, and complex preparation processes have all resulted in the failure of super batteries to break through the formation difficulties, serious self-discharge, water loss, and carbon dioxide. Low content (<2wt.%

Method used

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  • Preparation method of conductive carbon material with hierarchical porous structure, and pole plate for lead acid battery
  • Preparation method of conductive carbon material with hierarchical porous structure, and pole plate for lead acid battery
  • Preparation method of conductive carbon material with hierarchical porous structure, and pole plate for lead acid battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: prepare the conductive carbon material of multilevel structure

[0050] The manufacturing method comprises the steps of:

[0051] 1) Synthesis of phenolic resin precursor

[0052] First dissolve 0.61g of phenol (phenol) in the flask in the temperature range of 40-42°C, add 0.13g of 20wt.% NaOH aqueous solution and stir for 10 minutes, then add 1.05g of formaldehyde dropwise and keep the temperature below 50 ℃, then raise the temperature to 70-75℃ and continue to stir for 1 hour, stop the heating and let the mixture cool down to room temperature naturally, use hydrochloric acid to adjust the pH value to about 7, and finally use a rotary evaporator to remove water at 50℃, and finally turn the light yellow The product was dissolved in 20 wt% ethanol solution.

[0053] 2) Synthesis of Hierarchical Porous Carbon / Silicon Oxide Composite Materials

[0054] The carbon / silicon oxide composite material with a hierarchical porous structure was prepared by co-assem...

Embodiment 2

[0066] Embodiment 2: Preparation and electrochemical characteristic characterization process of hierarchical porous carbon electrode

[0067]The obtained highly conductive hierarchical porous material is configured into an electrode slurry or directly combined with a conductive material to form an electrode; for example, the carbon material is uniformly mixed with a conductive agent, a binder, and a dispersing solvent in a certain proportion to obtain an electrode slurry , coated on the current collector, and dried to form an electrode. The obtained electrode is combined with the positive electrode, and a diaphragm and an electrolyte are added to form an initial battery; after the battery is activated, a lead-carbon electrode with excellent performance is obtained. For example, the obtained electrode is paired with a lead oxide electrode, separated by a separator, and an acidic electrolyte is added to form a single battery, and electrochemical tests are performed.

[0068] Th...

Embodiment 3

[0069] Embodiment 3: the preparation method of lead-carbon battery negative pole plate

[0070] The hierarchically porous structure conductive carbon material obtained in Example 1 was added to the negative electrode and the paste as an additive in different proportions, and the plate was prepared according to the formula of the negative electrode of the lead-acid battery of the electric power-assisted bicycle (attached table 2). The process of curing and formation is shown in Table 3, and the specific parameters of curing and formation are shown in Table 4. Finally, after the formed plate is dried, it is assembled, filled with acid and sealed in the way of traditional lead-acid battery, and then left for 24 hours for testing.

[0071] Table 2 Preparation formula of lead-carbon battery negative electrode

[0072]

[0073] Table 3 Lead-carbon battery curing process parameters

[0074] temperature humidity time 1 48℃ >98％ 48h 2 70℃ <2％

5h ...

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Abstract

The invention provides a preparation method of a conductive carbon material with a hierarchical porous structure. The method comprises: dissolving phenolic resin into an ethanol solution; dissolving a surface active agent F127 into an HCl-containing ethanol solution; then adding ethyl orthosilicate, silicon dioxide colloidal particles and the phenolic resin ethanol solution; transferring a mixture into a container, volatilizing ethanol, performing thermal polymerization in a reaction furnace of 100 DEG C to obtain a faint-yellow transparent thin film, and grinding the thin film into powder; putting the powder into a tubular muffle furnace, and performing carbonization under the nitrogen atmosphere protection; soaking a hierarchical porous structure carbon / silicon oxide composite material into HF of which the content is 5wt%, removing silicon oxide, only retaining carbon components of the hierarchical porous structure, washing a sample by using deionized water, and then performing drying to obtain the conductive carbon material with the hierarchical porous structure. According to the preparation method of the conductive carbon material with the hierarchical porous structure, the internal resistance of a lead acid battery electrode can be effectively reduced, and the utilization rate of active substances and the charge-discharge rate are improved; meanwhile, the electrode structure can be stabilized, and the recycling life is prolonged.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a battery, in particular to a preparation method of a conductive carbon material with a multi-level porous structure and a pole plate for a lead-acid battery. Background technique [0002] At present, the increasingly prominent energy crisis and environmental pollution have made the efficient storage and conversion of electric energy and clean energy an urgent problem to be solved by the whole society. Among them, electrochemical energy storage batteries are considered to be one of the most promising energy storage solutions. Compared with lithium-ion batteries, which represent the most potential high-performance secondary batteries in the 21st century, lead-acid batteries have shorter cycle life and lower energy power density. However, with its 150-year history, low price, mature technology, safety and reliability, lead-acid batteries still occupy more than 70% of the global mark...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/14H01M10/06
CPCH01M4/14H01M4/62H01M10/06Y02E60/10
Inventor 彭怡婷赖春艳徐群杰郭志刚
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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