Aqueous zinc ion secondary battery taking elemental sulfur or sulfide as positive electrode

A zinc-ion battery, elemental sulfur technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of poor conductivity, poor capacity utilization, low theoretical capacity of metal ferricyanide, etc., to improve discharge capacity and energy. density, meeting the requirements of large-scale applications, and the effect of good cycle stability

Inactive Publication Date: 2019-09-20
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, it was found that manganese dioxide has poor rate performance and short cycle life due to its poor conductivity and large volume change during charge and discharge, which hinders its further development.
Vanadium pentoxide has low discharge voltage, poor conductivity, unstable material structure, and low ion diffusion coefficient, resulting in low energy density of electrode materials
Metal ferricyanides have low theoretical capacity and poor capacity utilization in aqueous electrolytes

Method used

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  • Aqueous zinc ion secondary battery taking elemental sulfur or sulfide as positive electrode
  • Aqueous zinc ion secondary battery taking elemental sulfur or sulfide as positive electrode
  • Aqueous zinc ion secondary battery taking elemental sulfur or sulfide as positive electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Sublimed sulfur is used as the positive electrode active material, and the positive electrode plate is assembled according to the mass ratio of sublimated sulfur: acetylene black: polyvinylidene fluoride, which is 5:3:2, and is evenly mixed, and ground until a uniformly mixed slightly fluid paste slurry is formed. , and then evenly spread the paste slurry on a stainless steel foil of appropriate size, and finally leave it in an oven at 80°C for 12 hours, and then cut it into a sheet of appropriate size as the positive electrode of the battery. The negative electrode is high-purity zinc foil, which is soaked in absolute ethanol for 1 hour, and cut into pieces of appropriate size as the negative electrode. With a concentration of 3mol / L ZnSO 4 The aqueous solution is the electrolyte. The separator is a composite film assembled from polyethylene, polypropylene and polyethylene, and finally the prepared positive electrode, negative electrode, separator and electrolyte are ...

Embodiment 2

[0033] Settled sulfur is used as the positive electrode active material, and the positive electrode plate is assembled according to the mass ratio of settled sulfur: acetylene black: polyvinylidene fluoride is 8:1:1, and is evenly mixed, and ground with an agate mortar until a uniform mixture with slight fluidity is formed. Then spread the paste slurry evenly on a stainless steel foil of appropriate size, and finally dry it in an oven at 100°C for 15 hours, and cut it into a sheet of appropriate size as the positive electrode of the battery after drying. The negative electrode is high-purity zinc foil, which is soaked in absolute ethanol for 1 to 2 hours, and cut into sheets of appropriate size as the negative electrode. With a concentration of 3mol / L ZnSO 4 The aqueous solution is the electrolyte. The separator is glass fiber filter paper, and finally the prepared positive electrode, negative electrode, separator and electrolyte are assembled into an aqueous zinc-ion battery...

Embodiment 3

[0035] Nano-sulfur is used as the positive active material, and the positive plate is assembled according to the ratio of nano-sulfur: acetylene black: polyvinylidene fluoride with a mass ratio of 7:2:1, and is evenly mixed, and ground until a uniformly mixed slightly fluid paste slurry is formed. , and then evenly spread the paste slurry on a stainless steel foil of appropriate size, and finally dry it at 60°C for 18 hours, then cut it into a sheet of appropriate size as the positive electrode of the battery. The negative electrode is high-purity zinc foil, which is soaked in absolute ethanol for 1 to 2 hours, and cut into sheets of appropriate size as the negative electrode. With a concentration of 3mol / L ZnSO 4 The aqueous solution is the electrolyte. The diaphragm is ordinary filter paper, and finally the prepared positive electrode, negative electrode, diaphragm and electrolyte are assembled into a water-based zinc-ion battery. 24 hours after the battery is installed, t...

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Abstract

The invention provides an aqueous zinc ion battery taking elemental sulfur or sulfide as the positive electrode. The battery includes a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein elemental sulfur or sulfide is adopted as a positive electrode material, zinc and zinc alloy serve as a negative electrode material, and a soluble salt aqueous solution of zinc serves as an electrolyte. The positive electrode material, namely, elemental sulfur or sulfide, has the advantages of high voltage, high capacity, good cycle stability and the like, and thus the electrochemical performance of the aqueous zinc ion battery is significantly improved.

Description

technical field [0001] The invention relates to a water system zinc ion secondary battery with high energy density, which belongs to the fields of new chemical power sources and new energy batteries. Background technique [0002] Aqueous zinc-ion secondary battery is a new type of secondary battery. Because of its high safety, abundant electrode material resources and low price, and can be directly produced by using existing zinc-manganese battery equipment, it is considered to be used in power batteries and The field of energy storage batteries has great application prospects. At present, the positive electrode materials of this type of battery are mainly concentrated in materials such as manganese dioxide, vanadium pentoxide, Prussian blue analogues, carbon materials, and organic substances. For example, CN105390697A introduces a zinc-manganese ion battery utilizing a porous carbon / manganese dioxide composite electrode. For example, CN107221665A introduces a zinc ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/42H01M4/58H01M10/36
CPCH01M4/38H01M4/42H01M4/5815H01M10/36Y02E60/10
Inventor 李嵩王志超郭广志王昕宇文钟晟季世军孙俊才
Owner DALIAN MARITIME UNIVERSITY
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