Separator modifying method for zinc in negative battery

A zinc negative electrode and battery technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of high internal impedance of the battery, small pore size, unfriendly environment, etc., and achieve uniform potential distribution, reduce contact angle, and low cost effect

Inactive Publication Date: 2018-09-18
江苏羊羊绿色电池有限公司
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Technical problem to be solved: This application provides a method for modifying the diaphragm for zinc negative batteries, which can suppress zinc dendrites in a wide temperature range, and solve the problem that existing diaphragms for zinc negative batteries are toxic, unfriendly to the environment, expensive, and the pore size Technical issues such as small pores and high internal impedance of the battery

Method used

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Examples

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preparation example Construction

[0025] Preparation of the positive electrode sheet: first dissolve the binder polyvinylidene fluoride in N-methylpyrrolidone to make a dispersion with a mass fraction of 5%, and add Na 0.44 MnO 4 , acetylene black, and polyvinylidene fluoride are mixed in a mass ratio of 75:20:5, stirred evenly in a high-speed mixer, and the resulting mixture is evenly coated on the surface of graphite conductive paper, moved into a 120°C vacuum oven, and taken out after 6 hours , cut out to get the positive plate.

[0026] Electrolyte preparation: 28.4g of anhydrous sodium sulfate and 28.755g of zinc sulfate heptahydrate plus deionized water were fixed to 100mL, prepared to contain 2mol / L Na 2 SO 4 and 1mol / L ZnSO 4 aqueous solution to obtain an electrolyte.

[0027] Battery assembly: Zinc foil is used as the negative electrode, and the positive electrode sheet is used as the positive electrode, containing 2mol / L Na 2 SO 4 and 1mol / L ZnSO 4 The aqueous solution is used as the electroly...

Embodiment 1

[0034] Such as figure 1 As shown, a diaphragm modification method for zinc negative batteries, first disperses 1.0g of hydroxypropyl methylcellulose in 100g of deionized water to prepare an aqueous dispersion with a mass fraction of about 1%, and then hydroxypropyl methylcellulose The aqueous solution of base cellulose is evenly coated on the cellulose isolation film with a thickness of 0.3mm, put into the oven to dry, and set aside, the coating surface density of hydroxypropyl methylcellulose is 3-5mg / cm 2 , to obtain the self-made modified diaphragm 1.

[0035] Battery assembly: the prepared positive electrode sheet was used as the positive electrode, the zinc foil was used as the negative electrode, and 2mol / L Na 2 SO 4 and 1mol / LZnSO 4 The aqueous solution is used as the electrolyte, the diaphragm is self-made modified diaphragm 1, and the battery is assembled by lamination process. The battery test system for the assembled laminated hard-shell battery is tested. The t...

Embodiment 2

[0038] Such as figure 1 As shown, a method for modifying a separator for a zinc negative electrode battery, first heats and disperses 3.0 g of agar in 100 g of deionized water to prepare an aqueous solution with a mass fraction of about 3%, and evenly coats the agar aqueous solution on a 0.3 mm thick Put it in a cellulose isolation film, dry it in an oven, and set it aside. The density of the coated surface of agar is 3-5mg / cm 2 The self-made modified diaphragm 2 was obtained.

[0039] Battery assembly: the prepared positive electrode sheet was used as the positive electrode, the zinc foil was used as the negative electrode, and 2mol / L Na 2 SO 4 and 1mol / LZnSO 4 The aqueous solution is used as the electrolyte, the diaphragm is self-made modified diaphragm 2, and the battery is assembled by lamination process. The battery test system for the assembled laminated hard-shell battery is tested. The test temperature is 25°C and 60°C, the test current is 35mA / g, and the charge an...

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Abstract

The application discloses a method for suppressing zinc dendrite in a zinc negative electrode battery over a wide temperature range, and particularly relates to a separator modifying method for zinc in a negative battery, which uniformly disperses polymer compounds having hydrophilic groups in separators to reduce the contact angle between the electrolyte and the zinc negative electrode and make the potential distribution on the surface of the zinc negative electrode more uniform, thereby making the deposition of zinc ions more uniform. Compared with the existing method for inhibiting zinc dendrite, the method is not only more obvious in the effect of inhibiting zinc dendrite, but is more conducive to practical operation, and lower in cost.

Description

technical field [0001] The application relates to the technical field of chemical power sources, in particular to a method for modifying a diaphragm for a zinc negative battery. Background technique [0002] Zinc anode battery is a kind of battery that uses metallic zinc as the negative electrode of the battery. Due to the advantages of abundant resources, low price, green environmental protection, and high theoretical specific capacity (nearly 820mAh / g), zinc metal has become the current field of electrochemical energy storage. research focus. However, zinc anode batteries also have major problems, especially the problem of zinc dendrites. Zinc dendrites will lead to premature failure of the battery, and more seriously, it will cause battery explosion. The core problem with the battery. At present, anti-dendrite separators are often used in zinc anode batteries or heavy metals and their oxides are added to zinc powder to inhibit the growth of zinc dendrites. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/403H01M50/414
CPCH01M50/403Y02E60/10
Inventor 刘小琴
Owner 江苏羊羊绿色电池有限公司
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