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Graphene-containing lead-acid battery repairing agent and preparation method thereof

A lead-acid battery, graphene technology, applied in lead-acid batteries, graphene, single-layer graphene and other directions

Active Publication Date: 2020-08-07
广州纳为新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphene can be used for the repair of lead-acid batteries, however, because graphene is a hydrophobic substance, it tends to agglomerate and precipitate in aqueous solution, and it is difficult for current graphene to be uniformly and stably in the electrolyte of lead-acid batteries. dispersion

Method used

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  • Graphene-containing lead-acid battery repairing agent and preparation method thereof

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Embodiment 1

[0044] Preparation of graphene by electrochemical exfoliation method: connect two graphite flakes with a thickness of about 1 mm to the positive and negative electrodes of the DC power supply as the anode and cathode of the electrolytic cell, and prepare graphene by electrochemical exfoliation method. With 10% sulfuric acid solution as the electrolyte, the electrochemical stripping was carried out at a voltage of 10V. After 30 minutes, the graphene product suspended in the upper layer of the solution was collected. The obtained graphene was washed with deionized water and dried for later use.

Embodiment 2

[0046] This example tests the effect of dispersant on the stability of graphene in battery electrolyte (usually 30-40% sulfuric acid solution). First, graphene (10 mg), dispersant (100 mg) and water (10 mL) were mixed uniformly under ultrasonic treatment. Dispersants include nonionic surfactants (polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP) and polymer P123) and ionic surfactants (cetyltrimethylammonium bromide (CTAB), ten Sodium Dialkyl Sulfate (SDS)). The test results show that any one of the above-mentioned dispersants can effectively disperse graphene to obtain a graphene solution. Then, 1 mL of the above graphene solution was mixed with 10 mL of 35% sulfuric acid aqueous solution to test the stability of graphene in sulfuric acid electrolyte. The results are shown in Table 1, graphene stabilized by non-ionic surfactants such as PVA, PVP, and P123 showed good stability in the electrolyte. However, ionic surfactants such as SDS and CTAB cannot stabilize graphene i...

Embodiment 3

[0049] Example 3 Battery Repair Solution A

[0050] Graphene (20 g), polyvinylpyrrolidone (PVP; 20 g) and deionized water (20 L) were mixed and then sonicated for one hour. The above-mentioned homogeneous solution containing graphene is used as battery restoration agent A.

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Abstract

The embodiment of the invention provides a graphene-containing lead-acid battery repairing agent and a preparation method. The graphene-containing lead-acid battery repairing agent is prepared from graphene and a dispersing agent, and after the repairing agent is added into a lead-acid battery, the inert large-particle lead sulfate crystals are activated in the charging and discharging processes of the battery, so that the capacity of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lead-acid batteries, and in particular relates to a repair agent for lead-acid batteries containing graphene and a preparation method. Background technique [0002] Lead-acid batteries have been widely used for energy storage in devices such as automobiles, electric vehicles and uninterruptible power supplies. The main structure of a lead-acid battery includes positive and negative plates composed of lead compounds and an electrolyte. [0003] During the discharge process, the metallic lead (Pb) on the negative plate and the lead dioxide (PbO2) on the positive plate 2 ) reacts with sulfuric acid electrolyte to convert to lead sulfate (PbSO 4 ), the positive and negative plate reactions are as follows: [0004] Negative plate: Pb+H 2 SO 4 →PbSO 4 +2H + +2e, [0005] Positive plate: PbO 2 +H 2 SO 4 +2H + +2e→PbSO 4 +2H 2 O. [0006] During the charging process, lead sulfate (PbSO4) is convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/06
CPCH01M10/4242H01M10/06Y02E60/10C01B32/182C01B32/198H01M2300/0011H01M10/08C01B32/194C01B2204/22H01M2300/0005C01B2204/02C01B2204/04
Inventor 肖超贤
Owner 广州纳为新材料科技有限公司