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Carbon composite material, mixed paste, battery and preparation method

A technology of carbon composite materials and mixed liquids, applied in chemical instruments and methods, carbon compounds, battery electrodes, etc., can solve the problems of poor conductivity of activated carbon, irreversible adsorption of lignin, etc., reduce adsorption, improve high-rate charge and discharge performance and Effect of cycle life and stable performance

Active Publication Date: 2020-06-02
CHAOWEI POWER CO LTD +2
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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a carbon composite material, a paste, a battery and a preparation method. The carbon composite material uses high-conductivity graphite as the core, and the surface wraps activated carbon with a high specific surface area, and simultaneously solves the problems of poor electrical conductivity of activated carbon, Irreversible adsorption of lignin and severe hydrogen evolution can significantly improve the fast charging performance of lead-carbon batteries, reduce battery water loss, and prolong the cycle life of lead-carbon batteries

Method used

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  • Carbon composite material, mixed paste, battery and preparation method
  • Carbon composite material, mixed paste, battery and preparation method

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preparation example Construction

[0033] A method for preparing a carbon composite material, comprising the steps of:

[0034] Step 1. Dissolving or melting the sugar into a liquid;

[0035] Step 2. Weigh a certain amount of graphite, place it in the liquid, stir and soak it, and prepare a mixed solution;

[0036] Step 3. Prepare the carbon composite material from the mixture by spray carbonization.

[0037] In step 1, the sugar is monosaccharide or polysaccharide, and the monosaccharide or polysaccharide is dissolved in water or directly heated to a molten state or dissolved in lye or acid solution, and continuously stirred under the action of a stirrer until completely dissolved. Monosaccharides are glucose, fructose, etc.; polysaccharides are sugars such as sucrose and maltose; the preferred one is sucrose, which has abundant yield and low cost.

[0038] The lye is sodium hydroxide or potassium hydroxide solution, the acid solution is dilute sulfuric acid or dilute nitric acid, and the water is pure water...

Embodiment 1

[0051] 1. Weigh 100g of sucrose with an analytical balance, then add 1000g of pure water and stir until completely dissolved, add 100g of flake graphite (the particle size of flake graphite is 12-50um) into the solution until fully mixed, soak for 24 hours, and obtain a mixed solution.

[0052] 2. The above mixed liquid is atomized by the spray carbonization method, transported to a high-temperature tube furnace through a nitrogen gas flow at 900°C for carbonization treatment, then cooled and collected, washed with pure water for several times, and dried at 100°C to prepare a carbon composite material (1).

[0053] figure 1 It is the XRD pattern of the carbon composite material (1), and it can be seen from the figure that the characteristic peaks of activated carbon appear at the positions of 2θ=26.21° and 43.51°. At the same time, a strong diffraction peak of graphite (002) appears at the position of 2θ angle of 26.5°, with high intensity and small half-peak width. The prepa...

Embodiment 2

[0055] 1. Weigh 50g of sucrose with an analytical balance, then add 1000g of pure water and stir until completely dissolved, add 100g of spherical graphite (the particle size of spherical graphite is 7-20um) into the solution until fully mixed, soak for 36 hours, and obtain a mixed solution.

[0056] 2. The above-mentioned mixed liquid is atomized by spray carbonization method, and transported to a high-temperature tube furnace by nitrogen gas flow for carbonization treatment at 1000°C. Then it was collected under cooling, washed several times with pure water and dried at 100°C. A carbon composite material (2) is prepared.

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Abstract

The invention discloses a carbon composite material, mixed paste, a battery and a preparation method, and belongs to the technical field of lead-carbon battery negative electrode materials. The carboncomposite material takes high-conductivity graphite as an inner core, the surface is coated with activated carbon with a high specific surface, and a core-shell structure of which the graphite surface is coated with activated carbon is formed. Meanwhile, the problems of poor conductivity of activated carbon, irreversible adsorption of lignin, serious hydrogen evolution and the like are solved, the quick charging performance of the lead-carbon battery can be remarkably improved, the water loss of the battery is reduced, and the cycle life of the lead-carbon battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lead-carbon batteries, and in particular relates to a carbon composite material, a paste, a battery and a preparation method. Background technique [0002] Due to its high output power, safe and reliable use, and cheap raw materials, lead-acid batteries are currently one of the most widely used secondary batteries in the market. They are generally used for peak shaving and valley filling in energy storage, and frequency modulation energy storage. However, the cycle life of the lead-acid battery is low, and the negative electrode of the battery is easy to form coarse lead sulfate, which hinders the entry of the electrolyte, causing the internal active substances to fail to participate in the reaction, and the battery capacity decays until it fails. Researchers added carbon materials such as activated carbon and graphite to the negative electrode to prepare a lead-carbon bat...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/06C01B32/21C01B32/318
CPCC01B32/21C01B32/318H01M4/625H01M4/628H01M10/06Y02E60/10
Inventor 黄伟国刘孝伟陈理李妍王青山黄峥
Owner CHAOWEI POWER CO LTD
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