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A kind of composite organic expansion agent for negative electrode of lead-acid battery and preparation method thereof

A lead-acid battery and expansion agent technology, applied in lead-acid batteries, battery electrodes, circuits, etc., to achieve the effects of improving battery life, delaying sulfation, and reducing internal resistance

Active Publication Date: 2018-08-24
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent document with the notification number CN 101937996 B discloses a colloidal lead-acid battery negative lead paste for electric bicycles and its preparation method, which is used to solve the problems of improving the 2hr capacity of the battery, the low temperature capacity of -15°C and the long life

Method used

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  • A kind of composite organic expansion agent for negative electrode of lead-acid battery and preparation method thereof
  • A kind of composite organic expansion agent for negative electrode of lead-acid battery and preparation method thereof
  • A kind of composite organic expansion agent for negative electrode of lead-acid battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of composite organic expansion agent

[0025] Weigh 1.5g of sodium lignosulfonate and 0.5g of humic acid into a 250mL three-necked bottle, add 100mL of deionized water, and stir for 10min. Add 0.05g of ammonium persulfate, 0.01g of N-N'-methylenebisacrylamide, and 6g of acrylamide in sequence, and react at 40°C for 5 hours to obtain a brown solution. Add 100mL of isopropanol to the solution, and after standing for a certain period of time, the precipitate is separated and washed with ethanol several times to obtain the composite organic expansion agent.

[0026] 2. Material Characterization

[0027] The humic acid, sodium lignosulfonate and the above composite materials were detected by infrared spectroscopy. The result is as figure 1 As shown, humic acid (a), sodium lignosulfonate (b) and composite material (c) all have absorption in each wavelength range, and the composite material has higher absorption intensity at each wavelength. 3400cm -1 The l...

Embodiment 2

[0042] Weigh 2 g of sodium lignosulfonate and 0.5 g of humic acid into a 250 mL three-necked bottle, add 100 mL of deionized water, and stir for 15 min. Add 0.06g of ammonium persulfate, 0.015g of N-N'-methylenebisacrylamide, and 6.5g of acrylamide in sequence, and react at 45°C for 5 hours to obtain a brown solution. Add 100 mL of isopropanol to the solution, and after standing for a certain period of time, the precipitate is separated and washed several times with ethanol.

Embodiment 3

[0044] Weigh 2.5g of sodium lignosulfonate and 0.7g of humic acid into a 250mL three-necked bottle, add 100mL of deionized water, and stir for 20min. Add 0.07g of ammonium persulfate, 0.02g of N-N'-methylenebisacrylamide, and 7g of acrylamide in sequence, and react at 50°C for 5 hours to obtain a brown solution. Add 100 mL of isopropanol to the solution, and after standing for a certain period of time, the precipitate is separated and washed several times with ethanol.

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Abstract

The invention discloses a composite organic expansive agent for a negative electrode of a lead-acid storage battery and a preparation method of a composite organic expansive agent. The method comprises the following steps of mixing and dissolving sodium lignosulphonate and humic acid in water; adding an initiator, a cross-linking agent and acrylamide; and carrying out graft copolymerization to prepare the composite organic expansive agent. According to the method, the graft copolymerization is used for preparing a composite material of the sodium lignosulphonate and the humic acid, so that the composite material simultaneously has favorable performance of the sodium lignosulphonate and the humic acid, and the service lifetime of the storage battery is effectively prolonged; and the composite material has more active functional groups than that of a single material, sulfation can be effectively delayed, and the internal resistance is reduced.

Description

technical field [0001] The invention relates to the technical field of lead-acid storage battery manufacturing, in particular to a composite organic expansion agent for negative electrodes of lead-acid storage batteries and a preparation method thereof. Background technique [0002] There are two main functions of the organic expansion agent in the negative plate: one is to prevent the surface area of ​​the negative active material from shrinking during the cycle, these materials can be adsorbed on the surface of the electrode, and reduce the energy of the system by reducing the surface tension; , which affects the formation of PbSO during negative electrode discharge 4 crystallization. [0003] At present, the main organic expansion agents used in the negative electrode of lead-acid batteries are sodium lignin sulfonate and humic acid, both of which have the same active functional group, which can delay the passivation of the negative plate and improve the utilization rate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/06
CPCH01M4/628H01M10/06Y02E60/10
Inventor 张丽芳张慧姚秋实李丹田庆山
Owner TIANNENG BATTERY GROUP
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