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Method for prolonging cycle life of zinc battery and application thereof

A technology of cycle life and zinc battery, which is applied to a porous coating for inhibiting the growth of zinc dendrites/protrusions and its preparation, is applied in the field of long-life zinc battery, and can solve the problems of high cost, long preparation time, self-corrosion and the like, Achieve the effect of increasing cycle life, reducing energy density and power density, and major economic and social benefits

Active Publication Date: 2018-09-11
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this battery also has its inherent problems: during the charging and discharging process of the battery, zinc ions are repeatedly dissolved and deposited on the surface of the metal zinc negative electrode, and dendritic deposits are easily formed under the action of the "tip effect".
However, the spongy zinc anode in this study requires multiple processing steps such as pressing, first annealing, then thermal oxidation, and finally electrochemical reduction, which requires long preparation time and high cost.
Invention patent CN 104518205 A discloses a method for preparing a zinc negative electrode. The metal zinc is pretreated with a strong oxidizing solution to modify its surface. This process is mainly used to overcome the problem of hydrogen evolution and self-corrosion of the zinc negative electrode, and the cycle life of the battery remains the same. less than 20 times
This problem is the core problem that has restricted the development of long-life secondary zinc batteries for a long time

Method used

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  • Method for prolonging cycle life of zinc battery and application thereof
  • Method for prolonging cycle life of zinc battery and application thereof
  • Method for prolonging cycle life of zinc battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 0.360 g nanometer zirconia (ZrO 2 , 10 nm) and 0.040 g PVDF binder, mix them in a mortar and mix well, then pour into a weighing bottle, add NMP solvent, stir magnetically for 4 h at room temperature, after the slurry is evenly stirred, select Apply a film applicator with a suitable thickness, evenly coat a porous coating with a thickness of 230-300 microns on the surface of the pre-cleaned zinc foil, and dry it in vacuum at 60°C for 12 hours. The dried porous ZrO 2 Coated zinc foil cut into Φ = 16 mm discs, and then assembled symmetrical cells to test related electrochemical performances. The electrolyte uses 0.5 M ZnSO 4 Solution, battery separator using filter paper. Its technical effect is as Figure 1-2 shown.

Embodiment 2

[0043] Weigh 0.180 g of nano-alumina (Al 2 o 3 , 100 nm) and 0.030 g PVDF binder, mix them in a mortar and mix evenly, then pour into a weighing bottle, add NMP solvent, and stir magnetically for 4 h at room temperature. After the slurry is evenly stirred, select A film applicator with a suitable thickness is used to uniformly coat a porous coating with a thickness of 230-300 microns on the surface of the filter paper, and dry it in vacuum at 60 °C for 12 hours. Porous Al 2 o 3 The coated filter paper is the diaphragm, Φ = The 16 mm pre-cleaned zinc foil was used as the positive and negative electrodes, and a symmetrical battery was assembled to test the relevant electrochemical performance. The electrolyte uses 3 M ZnSO 4 + 0.1 M MnSO 4 solution, the battery separator is made of non-woven fabric. Compared with uncoated symmetric cells, the coating can increase the stability time of symmetric cells from 56 hours to 410 hours.

Embodiment 3

[0045] Weigh 0.010 g micron calcium carbonate (CaCO 3 , 2000 nm) and 0.080 g PVDF binder, mix them in a mortar and mix evenly, then pour into a weighing bottle, add NMP solvent, stir magnetically at room temperature for 2 h, after the slurry is evenly stirred, select Apply a film applicator with a suitable thickness, evenly coat a porous coating with a thickness of 230-300 microns on the surface of the pre-cleaned zinc foil, and dry it in vacuum at 60°C for 12 hours. Dry porous CaCO 3 Coated zinc foil cut into Φ = 16 mm discs, and then assembled symmetrical cells to test related electrochemical performances. The electrolyte uses 1.5 M ZnSO 4 Solution, battery separator using filter paper. The coating can increase the stability time of symmetric cells from 45 hours to 367 hours relative to uncoated symmetric cells.

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Abstract

The invention discloses a method for prolonging the cycle life of a zinc battery and application thereof. A method of inhibiting the zinc dendritic crystal / bulge growth on the surface of a zinc negative electrode through a porous coating is used; the porous coating is used for prolonging the cycle life of the zinc battery; the porous coating is positioned between the zinc negative electrode and abattery diaphragm. Compared with the prior art, the porous coating disclosed by the invention has the advantages of low price, light weight and no pollution; continuous production can be realized on the existing battery coating equipment; the assembly process of the ordinary secondary zinc battery is not influenced; the energy density and power density of the secondary zinc battery cannot be obviously reduced; the cycle life of the secondary zinc battery can also be obviously prolonged; the method can be applicable to a battery system using metal zinc as the negative electrode; important economic and social benefits are realized.

Description

technical field [0001] The invention belongs to the field of secondary batteries, relates to a method for improving the cycle life of zinc batteries and its application, in particular to a porous coating for inhibiting the growth of zinc dendrites / protrusions and its preparation method and its application in long-life zinc batteries Applications. Background technique [0002] With the depletion of fossil resources such as coal and petroleum and the deterioration of the environment, the development of renewable energy such as solar energy, wind energy, and water energy has become a global trend. As a high-efficiency electrochemical energy storage device, batteries have been widely used in fields such as electric vehicles and mobile communications, but primary batteries are prone to waste of resources. The shortage of resources and the urgent need for environmental protection have prompted people to vigorously develop new battery systems with high specific energy and green en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38
CPCH01M10/38H01M2220/20H01M2220/30Y02E60/10Y02P70/50
Inventor 康利涛姜付义崔芒伟周艳丽
Owner YANTAI UNIV
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