Graphene coated lead powder composite material and application thereof

A technology of graphene-coated and ene-coated lead powder, which is applied in the direction of lead-acid battery, lead-acid battery electrode, lead-acid battery construction, etc., can solve the problems of complicated process in the early stage, difficulty in industrialization, and large environmental pollution, and achieve improvement Conductive properties, prolonging life, and improving conversion efficiency

Inactive Publication Date: 2014-02-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention solves the problem of the combination of graphene and lead very well, and also improves the effective contact area between the two. Ho

Method used

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  • Graphene coated lead powder composite material and application thereof
  • Graphene coated lead powder composite material and application thereof
  • Graphene coated lead powder composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Mix 40g of commercial lead powder, 200ml of ethanol and 4ml of deionized water under high-speed stirring for 10min, then add 0.1g of aminosilane coupling agent KH550, heat and stir at 60°C for 10h, suction filter and wash to remove uncontaminated lead powder The coupled KH550 is dried and ground to obtain a modified positively charged lead powder.

[0039] Take 300ml of graphene oxide aqueous solution with a concentration of 1mg / ml, and ultrasonically disperse it uniformly for 1h. Add the above-mentioned modified lead powder into 100ml of deionized water, stir for 10min, then slowly add 300ml of graphene oxide aqueous solution, shake and stir, after standing for 30min, it can be seen that the solution is obviously stratified, and the color of the upper layer becomes lighter. Slowly clarify, the color of the sediment in the lower layer gradually turns brown, suction filtration, washing, drying, and grinding to obtain a composite material of graphene oxide-coated lead pow...

Embodiment 2

[0042] Mix 40g of commercial lead powder, 200ml of ethanol and 4ml of deionized water under high-speed stirring for 10min, then add 0.1g of aminosilane coupling agent KH550, heat and stir at 60°C for 10h, suction filter and wash to remove uncontaminated lead powder The coupled KH550 is dried and ground to obtain a modified positively charged lead powder.

[0043] Take 400ml of graphene oxide aqueous solution with a concentration of 1mg / ml, and ultrasonically disperse it uniformly for 1h. Add the above-mentioned modified lead powder into 100ml of deionized water, stir for 10min, then slowly add 350ml of graphene oxide aqueous solution, shake and stir, after standing for 30min, it can be seen that the solution is obviously stratified, and the color of the upper layer becomes lighter. Slowly clarify, the color of the sediment in the lower layer gradually turns brown, suction filtration, washing, drying, and grinding to obtain a composite material of graphene oxide-coated lead pow...

Embodiment 3

[0046] First, mix 40g of commercial lead powder, 200ml of ethanol and 4ml of deionized water under high-speed stirring for 10min, then add 0.2g of aminosilane coupling agent KH570, heat and stir at 60°C for 10h, suction filter, and wash to remove the lead powder that is not mixed with the lead powder. The coupled KH570 is dried and ground to obtain a modified positively charged lead powder.

[0047] Take 500ml of graphene oxide aqueous solution with a concentration of 1mg / ml, and ultrasonically disperse it uniformly for 1h. Add the above-mentioned modified lead powder into 100ml of deionized water, stir for 10min, then slowly add 300ml of graphene oxide aqueous solution, shake and stir, after standing for 30min, it can be seen that the solution is obviously stratified, and the color of the upper layer becomes lighter. Slowly clarify, the color of the sediment in the lower layer gradually turns brown, suction filtration, washing, drying, and grinding to obtain a composite mater...

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Abstract

The invention discloses a graphene coated lead powder composite material and an application thereof. A preparation method of graphene coated lead powder composite material comprises the following steps of: (1) modifying lead powder by using an aminosilane coupling agent so that the lead powder has positive charges on the surface, and then obtaining the modified lead powder with positive charges; (2) carrying out self-assembly of the modified lead powder obtained in the step (1) with oxidized graphene in deionized water A through electrostatic adsorption to obtain the oxidized graphene coated lead powder composite material; and (3) reducing the oxidized graphene coated lead powder composite material obtained in the step (2) into the graphene coated lead powder composite material. The graphene coated lead powder composite material can be used as the cathode material of a lead-carbon super battery. A polar plate made from the graphene coated lead powder composite material is good in mechanical strength; a battery made from the composite material as the cathode material is excellent in charge/discharge performance, power density, specific capacity and cycle life.

Description

technical field [0001] The invention relates to a graphene-coated lead powder composite material prepared by an electrostatic self-assembly method and its application as a negative electrode material of a lead-carbon super battery. Background technique [0002] After more than 100 years of development, lead-acid batteries have the advantages of mature technology, good safety performance, low cost, stable performance and high resource regeneration recovery rate, and have made great contributions in many applications. With the development of the electric vehicle industry, there are greater requirements for battery charge and discharge performance and cycle life. However, the power density of lead-acid batteries is not high. , the negative electrode is prone to irreversible "sulfation", resulting in its cycle life much lower than its potential life. Therefore, it is necessary to modify the lead-acid battery to improve its power density, charge and discharge performance and cyc...

Claims

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Application Information

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IPC IPC(8): H01M4/57H01M4/62H01M4/20H01M10/12
CPCY02E60/126H01M4/364H01M4/625H01M10/06Y02E60/10Y02P70/50
Inventor 郑华均陈城勇邸婧
Owner ZHEJIANG UNIV OF TECH
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