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Positive electrode material of zinc-polymer water-based rechargeable battery and preparation method of low-temperature-resistant electrolyte of zinc-polymer water-based rechargeable battery

A positive electrode material and rechargeable battery technology, applied in the field of electrochemical energy storage devices, can solve the problems of increased charge transfer resistance, decreased ionic conductivity, increased electrolyte viscosity, etc., and achieves a wide working temperature range, high ionic conductivity, Low viscosity effect

Inactive Publication Date: 2020-12-04
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding conventional ethylene glycol antifreeze will increase the viscosity of the electrolyte at low temperatures, resulting in a decrease in ionic conductivity and a significant increase in charge transfer resistance, which will seriously attenuate the performance of the battery at low temperatures.

Method used

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  • Positive electrode material of zinc-polymer water-based rechargeable battery and preparation method of low-temperature-resistant electrolyte of zinc-polymer water-based rechargeable battery
  • Positive electrode material of zinc-polymer water-based rechargeable battery and preparation method of low-temperature-resistant electrolyte of zinc-polymer water-based rechargeable battery

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Embodiment Construction

[0016] The present invention is described further below in conjunction with example, but the present invention is not limited to specific embodiment.

[0017] (1) The high specific area (2230mg / cm 2 ) porous activated carbon powder, polyvinylidene fluoride, and conductive acetylene black were dispersed in N-methylpyrrolidone (NMP) in a mass ratio of 8:1:1, and then magnetically stirred for 12 hours to obtain a uniform carbon powder slurry (10mg / mL ).

[0018] (2) Coat the carbon powder slurry evenly on the cleaned graphite fiber felt. After repeated coating several times, the loading of activated carbon can be controlled at 15-25mg / cm 2 between. Then the graphite felt coated with the slurry was dried in an oven at 70°C for 5 hours.

[0019] (3) Weigh 1,6-dihydroxynaphthalene powder and add it to 1M sulfuric acid aqueous solution to make an acidic solution containing small organic molecules (0.02-0.08M), which is used as a precursor for electrochemical polymerization liquid...

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Abstract

The invention provides a low-temperature-resistant water-based zinc-polymer battery. The low-temperature-resistant water-based zinc-polymer battery comprises preparation of a positive electrode and preparation of a low-temperature-resistant zinc sulfate electrolyte. An organic electrode material is prepared by allowing any one of three aromatic organic molecules provided by the invention and having energy storage effect verified by experiments to attach to a substrate of porous activated carbon by an electrochemical polymerization deposition method. Methanol is added into a zinc sulfate electrolyte with a certain concentration, so the effects of greatly reducing a freezing point and keeping good ionic conductivity at low temperature are achieved, and the zinc ion battery can normally workwithin a temperature range of -30 DEG C to -50 DEG C. According to a polymer positive electrode material-zinc negative electrode combined energy storage device provided by the invention, a sweep voltage window can be broadened from 0.1-1.7 V at normal temperature to 0.1-2.2 V in a low-temperature environment of -20 DEG C, and charge storage capacity can be kept at about 55% at normal temperature.

Description

technical field [0001] The invention relates to the preparation of a positive electrode material of a zinc-polymer aqueous secondary battery capable of low temperature resistance and a preparation method of a low temperature resistant electrolyte, belonging to the field of electrochemical energy storage devices. The polymer electrode material does not contain transition metal elements, and is simple to prepare and low in cost; zinc sulfate aqueous solution is used as the electrolyte, which has the advantages of low cost and high ion mobility, but it will freeze in a severe cold environment, which makes the energy storage device unable to operate at low temperature. Work. The invention not only relates to several novel organic electrode materials, aiming at improving the energy storage density of devices, but also relates to a low-temperature-resistant aqueous electrolyte, which can make devices normally charge and discharge under the environment of -30°C. The water-based zinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/60H01M4/04H01M4/66H01M10/36H01M10/38
CPCH01M4/0452H01M4/362H01M4/587H01M4/602H01M4/606H01M4/663H01M10/36H01M10/38H01M2004/028H01M2300/0002H01M2300/0091Y02E60/10Y02P70/50
Inventor 刘金章李桓杨潇
Owner BEIHANG UNIV
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