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Lead-carbon composite particle and preparation method thereof

A technology of composite particles and lead carbon, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of easy precipitation and peeling of activated carbon, poor affinity of lead powder, and large amount of activated carbon added, so as to improve stability and use safety sexual effect

Active Publication Date: 2017-05-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anode material made by simply mixing lead and carbon materials can realize high-current charge and discharge well in a short period of time, but the carbon material has poor affinity with lead powder due to its low density, and activated carbon is easy to precipitate after long-term cycling. , peeling off, resulting in powdering of the negative electrode and poor cycle life
In addition, due to the large amount of activated carbon added, the hydrogen evolution at the negative electrode is serious, and the battery loses water seriously.

Method used

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  • Lead-carbon composite particle and preparation method thereof
  • Lead-carbon composite particle and preparation method thereof
  • Lead-carbon composite particle and preparation method thereof

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preparation example Construction

[0034] The preparation method of above-mentioned lead-carbon composite particle comprises the following steps:

[0035] 1) sodium hydroxide solution and lead acetate solution are mixed homogeneously, fully reacted, the precipitate that generates is separated, obtains lead hydroxide;

[0036] 2) Dispersing lead hydroxide in the PVP solution, fully reacting, separating the resulting PVP modified lead hydroxide precipitate, adding it to absolute ethanol, adding water, and dispersing evenly to obtain a dispersion;

[0037] 3) Add the tetramethylammonium hydroxide solution to the dispersion in step 2), and react fully, then add the ethanol solution of ethyl orthosilicate, react fully, separate the formed precipitate, and obtain a silica coating lead hydroxide;

[0038] 4) Disperse the silica-coated lead hydroxide in the glucose solution and react fully to obtain C@[SiO 2 @Pb(OH) 2 ];

[0039] 5) The C@[SiO 2 @Pb(OH) 2 ] into zinc chloride solution for impregnation, fully drie...

Embodiment 1

[0056] 1) Mix 80mL of 20g / L sodium hydroxide solution and 40mL of 400g / L lead acetate solution evenly, react for 2 hours, separate the formed white precipitate, wash it with deionized water, and obtain lead hydroxide;

[0057] 2) Disperse lead hydroxide in 150mL of 30g / L PVP solution, stir and react for 10 hours, separate the resulting pale yellow PVP-modified lead hydroxide precipitate, add it to 130mL absolute ethanol, and add 8mL Deionized water, ultrasonic dispersion for 10 minutes to obtain a dispersion;

[0058] 3) While stirring, add 100 μL of tetramethylammonium hydroxide solution with a mass fraction of 10% dropwise to the dispersion in step 2), fully react, and then add 20 mL of tetramethylammonium hydroxide solution with a volume fraction of 0.05% dropwise The ethanol solution was dropped within 2 hours, and the stirring reaction was kept for 10 hours, and the white precipitate generated was separated to obtain silica-coated lead hydroxide;

[0059] 4) Disperse sil...

Embodiment 2

[0062] 1) Mix 160mL of 10g / L sodium hydroxide solution and 40mL of 20g / L lead acetate solution evenly, react for 2 hours, separate the formed white precipitate, wash it with deionized water, and obtain lead hydroxide;

[0063] 2) Disperse lead hydroxide in 150mL of 10g / L PVP solution, stir and react for 10 hours, separate the resulting pale yellow PVP-modified lead hydroxide precipitate, add it to 130mL absolute ethanol, and add 8mL Deionized water, ultrasonic dispersion for 10 minutes to obtain a dispersion;

[0064] 3) While stirring, add 100 μL of tetramethylammonium hydroxide solution with a mass fraction of 30% dropwise to the dispersion in step 2), fully react, and then add dropwise 20 mL of tetramethylammonium hydroxide solution with a volume fraction of 0.05% The ethanol solution was dropped within 2 hours, and the stirring reaction was kept for 10 hours, and the white precipitate generated was separated to obtain silica-coated lead hydroxide;

[0065] 4) Disperse sil...

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Abstract

The invention discloses a lead-carbon composite particle and a preparation method thereof. The outer layer of the lead-carbon composite particle is a conductive carbon layer, and the inside comprises a plurality of silicon-dioxide-coated Pb&PbO particles. The preparation method comprises the following steps: 1) preparing lead hydroxide; 2) preparing PVP-modified lead hydroxide; 3) preparing silicon-dioxide-coated lead hydroxide; 4) preparing C@[SiO2@Pb(OH)2]; and 5) adding the C@[SiO2@Pb(OH)2] into a zinc chloride solution, impregnating, separating, drying and carrying out carbonization calcination. The outer layer of the lead-carbon composite particle is a high-conductivity carbon layer, and the inside comprises the plurality of silicon-dioxide-coated Pb&PbO particles; the overall density is approximate to that of lead powder; the lead-carbon composite particle can be uniformly mixed with the lead powder in the paste mixing process during lead-acid battery preparation; the lead-carbon composite particle has higher hydrogen evolution overpotential than the conventional carbon material; the addition amount of the lead-carbon composite particle in the lead-acid battery can reach 5 wt%; and the nano silicon dioxide transition layer coated outside the Pb&PbO can effectively isolate the Pb&PbO from the carbon layer, thereby enhancing the stability and use safety in the lead-carbon composite particle preparation process.

Description

technical field [0001] The invention relates to a lead-carbon composite particle and a preparation method thereof, belonging to the technical field of lead-carbon batteries. Background technique [0002] As a traditional chemical power source, lead-acid battery has the advantages of low cost, good safety, mature manufacturing process, wide application range, high recovery rate, etc. It is widely used in automobiles, hybrid vehicles, sustainable power supply equipment (UPS), solar traffic lights Among other equipment, it plays a pivotal role in the progress of human society and the development of industry. [0003] Due to the increasingly serious environmental pollution problems worldwide, countries around the world have legislated to limit carbon dioxide emissions, prompting researchers to intensify the development of electric vehicles (EVs) and hybrid electric vehicles (HEVs). Hybrid electric vehicles (HEVs) have been well developed as a transitional means of transportatio...

Claims

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Application Information

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IPC IPC(8): H01M4/57H01M4/36H01M4/587H01M4/62
CPCH01M4/366H01M4/57H01M4/587H01M4/625Y02E60/10
Inventor 石光赵微陈红雨赵瑞瑞
Owner SOUTH CHINA NORMAL UNIVERSITY
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