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Silica activated carbon composite material, its preparation method and lead-carbon battery

A technology of composite materials and silicon dioxide, applied in the direction of lead-acid batteries, battery electrodes, circuits, etc., can solve the problems of cycle life and high current charge and discharge acceptance ability, weak fast charge acceptance ability, and poor low temperature charge and discharge ability To achieve the effect of improving the ability to accept high-current charge and discharge, inhibiting irreversible sulfation, and improving the distribution

Inactive Publication Date: 2018-08-14
润高投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: low mass specific energy, low volume specific energy, short cycle life, weak fast charge acceptance ability, poor low temperature charge and discharge ability, etc.
[0005] Looking at the existing lead-carbon batteries, their cycle life and high current charge and discharge capacity are still not ideal

Method used

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  • Silica activated carbon composite material, its preparation method and lead-carbon battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The method for comprehensively recycling rice husk and its derivatives and preparing porous ultrafine silica activated carbon composite materials for lead-carbon batteries comprises the following steps:

[0041] 1) Soak the rice husk in sulfuric acid solution for 24 hours, the concentration of sulfuric acid is 1mol / L, filter and wash to obtain purified rice husk;

[0042] 2) Put the purified rice husks into a tube furnace, and undergo drying, carbonization and primary activation treatment to obtain carbonized rice husks;

[0043] The heating system is divided into three temperature control stages:

[0044] Heating stage 1, heating rate 3°C / min, to 100°C, keep warm for 20min;

[0045] Heating stage 2, N 2 , the carrier gas flow rate is 5L / min, the heating rate is 6°C / min, and the temperature is kept at 600°C for 100min;

[0046] In heating stage 3, water vapor is introduced, the carrier gas flow rate is 5L / min, the heating rate is 6°C / min, and the temperature is reach...

Embodiment 2

[0052] The method for comprehensively recycling rice husk and its derivatives and preparing porous ultrafine silica activated carbon composite materials for lead-carbon batteries comprises the following steps:

[0053] 1) Soak the rice husk in sulfuric acid solution for 36 hours, the concentration of sulfuric acid is 0.85mol / L, filter and wash to obtain purified rice husk;

[0054] 2) Put the purified rice husks into a tube furnace, and undergo drying, carbonization and primary activation treatment to obtain carbonized rice husks;

[0055] The heating system is divided into three temperature control stages:

[0056] Heating stage 1, heating rate 2.5°C / min, to 95°C, keep warm for 30min;

[0057] Heating stage 2, N 2 , the carrier gas flow rate is 4L / min, the heating rate is 5°C / min, to 550°C, hold for 120min;

[0058] Heating stage 3, CO2 2 , the carrier gas flow rate is 4L / min, the heating rate is 5°C / min, to 750°C, keep warm for 80min, then stop heating, and continue to p...

Embodiment 3

[0063] The method for comprehensively recycling rice husk and its derivatives and preparing porous ultrafine silica activated carbon composite materials for lead-carbon batteries comprises the following steps:

[0064] 1) Soak the rice husk in hydrochloric acid solution for 12 hours, the concentration of hydrochloric acid is 1.25mol / L, filter and wash to obtain purified rice husk;

[0065] 2) Put the purified rice husks into a tube furnace, and undergo drying, carbonization and primary activation treatment to obtain carbonized rice husks;

[0066] The heating system is divided into three temperature control stages:

[0067] Heating stage 1, heating rate 3.5°C / min, to 105°C, keep warm for 15min;

[0068] Heating stage 2, N 2 , the carrier gas flow rate is 6L / min, the heating rate is 8°C / min, and the temperature is kept at 650°C for 90min;

[0069] In heating stage 3, water vapor is introduced, the carrier gas flow rate is 6L / min, the heating rate is 8°C / min, to 850°C, keep w...

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Abstract

The invention relates to a silicon dioxide active carbon composite material and a preparation method thereof as well as a lead-carbon battery. The preparation method comprises the following steps: (1) soaking rice hulls with an inorganic strong acid solution and purifying; (2) drying and carbonizing the purified rice hulls and carrying out activation treatment for the first time to obtain carbonized rice hulls, wherein a heating system is divided into three sections; (3) putting the carbonized rice hulls into an inorganic strong alkali solution, and slowly adding a diluted inorganic strong acid solution, wherein the mol ratio of solutes in the added inorganic strong acid solution and inorganic strong alkali solution is (1 to 10): 1; stirring, filtering and washing, thus obtaining a precursor; (4) drying and activating the precursor for the second time to obtain the silicon dioxide active carbon composite material. The porous ultrafine silicon dioxide active carbon composite material prepared by the preparation method is applied into active substances of a negative pole of a lead acid battery, so that the cycle life of the lead-carbon battery is prolonged, and a large-current charging / discharging accepting capability of the lead-carbon battery is improved; the cycle life of the lead acid battery is prolonged by more than one time.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a porous ultrafine silicon dioxide activated carbon composite material for lead-carbon batteries and a preparation method thereof. Background technique [0002] Lead-acid batteries have the advantages of low price, high safety, stable electrical performance, and low recycling cost. They are widely used in electric vehicles, communications industries, energy storage fields in the power industry, and rapidly developing new energy vehicles and other industries. With the development of emerging battery technologies such as lithium-ion batteries, polymer lithium-ion batteries, proton exchange membrane fuel cells, and direct methanol fuel cells, the competitiveness of lead-acid batteries has weakened due to their own shortcomings. The share in the traditional field is decreasing. Its disadvantages are: low mass specific energy, low volume specific energy, short cycle lif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/56H01M4/583H01M10/06
CPCH01M4/362H01M4/48H01M4/56H01M4/583H01M10/06Y02E60/10
Inventor 黎朝晖蒋良兴张玘徐振轩胡林李建颖何亚玲方瑛
Owner 润高投资有限公司
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