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Preparation method of activated carbon for multi-element co-doped lead-carbon batteries

A lead-carbon battery and activated carbon technology, applied in secondary batteries, battery electrodes, non-metallic elements, etc., can solve the problem of water loss in lead-carbon batteries, which has not been effectively solved, weaken the influence mechanism of modifiers, and reduce the hydrogen evolution point of electrodes. and other problems, to achieve the effects of excellent electron transport performance, favorable absorption and diffusion, and improvement of hydrogen evolution potential

Inactive Publication Date: 2017-06-16
HENAN CHAOWEI POWER SUPPLY
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] Although the introduction of carbon materials can solve the problems of severe sulfation and short cycle life, it also introduces a new defect: reducing the hydrogen evolution point of the electrode
Pb, Bi, Se, Sn, Ga, and In can all increase the hydrogen evolution overpotential of the electrode in an appropriate ratio; therefore, they have become the first choice modifiers for people to improve the severe dehydration of lead-carbon batteries, but their incorporation methods are inconsistent. It is a simple mechanical mixing of activated carbon, modifier and lead powder. Since the amount of activated carbon and modifier added is only 0.05-5% compared with lead powder, the actual contact between modifier and activated carbon is very little, which greatly weakens the improvement. Mechanism of effect of additives on increasing hydrogen evolution potential of activated carbon
Therefore, the dehydration problem of lead-carbon batteries with modifiers has not been effectively solved

Method used

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Embodiment 1

[0029] The preparation method of multi-element co-doped lead-carbon battery activated carbon of the present invention, the detailed steps of this preparation method are as follows:

[0030] a. Preparation of nitrogen-enriched activated carbon: first, dry the purchased nitrogen-enriched biomass. After drying, the moisture content of the nitrogen-enriched biomass is ≤0.1%; The mass ratio is mixed, and after mixing evenly, add water to completely submerge the mixed substance. The mass volume ratio between the dried nitrogen-enriched biomass and water is 1g: 4mL. After adding water, let it stand for 1 hour; The biomass completely adsorbs the activator KOH solution, and then puts it in a nickel kettle with nitrogen gas, heats up to 800°C (the heating rate is controlled at 5-10°C / min), and heats it for 1 hour at this temperature; Cool to room temperature, then use dilute hydrochloric acid (the concentration of dilute hydrochloric acid is 15%) to remove the activator KOH in the obtai...

Embodiment 2

[0037] The preparation method of multi-element co-doped lead-carbon battery activated carbon of the present invention, the detailed steps of this preparation method are as follows:

[0038] a. Preparation of nitrogen-enriched activated carbon: first, dry the purchased nitrogen-enriched biomass. After drying, the moisture content of the nitrogen-enriched biomass is ≤0.1%; The mass ratio is mixed, and after mixing evenly, add water to completely submerge the mixed substance. The mass volume ratio between the dried nitrogen-enriched biomass and water is 1g: 3mL. After adding water, let it stand for 2 hours; The biomass completely adsorbs the activator NaOH solution, and then puts it in a nickel kettle with nitrogen gas, heats up to 700°C (the heating rate is controlled at 5-10°C / min), and heats it for 2 hours at this temperature; Cool to room temperature, then use dilute hydrochloric acid (the concentration of dilute hydrochloric acid is 18%) to remove the activator NaOH in the o...

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Abstract

The invention discloses a preparation method of activated carbon for multi-element co-doped lead-carbon batteries. The method includes: firstly drying purchased nitrogen-rich biomass, the performing mixing with an activating agent evenly, adding water till complete submersion, and performing standing treatment; then placing the treated mixture in a nitrogen gas introduced nickel kettle to conduct heating treatment, then performing cooling to room temperature, using dilute hydrochloric acid to remove the activating agent from the obtained carbon material, and using deionized water to perform washing to neutral, and then conducting drying to obtain nitrogen-rich activated carbon; dissolving a metal oxide in dilute nitric acid to obtain a metal oxide solution, then adding nitrogen-rich activated carbon and performing mixing, placing the obtained mixture in a vacuum box to conduct vacuum treatment and drying, then placing the mixture in a nitrogen gas-protecting carbonization furnace to perform heating treatment, thus obtaining the activated carbon for lead-carbon batteries, i.e. modified activated carbon. According to the invention, an element or metal oxide with high hydrogen evolution potential is loaded in activated carbon, the doping element exists in the form of metal oxide or nitrate or sulfate, so that the hydrogen evolution potential of the modified activated carbon can be significantly increased.

Description

technical field [0001] The invention relates to the application of multi-element co-doped activated carbon in the field of lead-carbon batteries, belonging to the field of electrochemical energy storage devices; in particular, it relates to a preparation method of multi-element co-doped activated carbon for lead-carbon batteries. Background technique [0002] With excellent electrochemical stability and high discharge rate, lead-acid battery has been a key device in the field of power and energy storage for more than 100 years. As early as 2012, the global demand for lead-acid batteries reached 415 million Vah. However, the disadvantages of low specific energy (30-40Wh), short life (300-600 cycles), large volume, and slow charging speed limit the development and application of lead-acid batteries to a certain extent. Some new technologies have been developed in recent years, such as corrosion-resistant alloy grids, nano-silica colloidal batteries, super batteries, lead-carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348H01M4/36H01M4/583H01M4/62H01M10/42
CPCC01P2004/80C01P2006/40H01M4/362H01M4/583H01M4/625H01M10/4235Y02E60/10
Inventor 张雷李松林闫新华王淼
Owner HENAN CHAOWEI POWER SUPPLY
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