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Preparation method of composite spherical cathode material for high-power aqueous zinc-ion battery

A zinc-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid capacity decay, reduced electrode energy density, poor high-current discharge characteristics, etc., to achieve low cost, easy recycling, The effect of excellent cycle life and rate performance

Active Publication Date: 2020-05-29
JISHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the positive electrode of aqueous zinc-ion battery, its initial discharge specific capacity is high, but the capacity decays rapidly during the cycle, and the high-current discharge characteristics are poor (such as Chinese patents CN10297662A, CN204651389U); Kang Feiyu and Chen Jun’s team reported a source of raw materials Wide range of low-cost aqueous zinc-ion battery cathode materials zinc manganate and defective zinc manganate (Chinese patents CN102097661A, CN105958131A), but while improving the cycle stability of the material, it reduces the specific capacity of the electrode or the energy density of the battery

Method used

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  • Preparation method of composite spherical cathode material for high-power aqueous zinc-ion battery
  • Preparation method of composite spherical cathode material for high-power aqueous zinc-ion battery
  • Preparation method of composite spherical cathode material for high-power aqueous zinc-ion battery

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Effect test

Embodiment 1

[0044] Dissolve zinc nitrate and manganese acetate in 10mL distilled water at a molar ratio of 1:10, the concentration of zinc salt and manganese salt is 0.8mol / L, then add urea, the molar ratio of urea to total metal ions in the system is 10:1 , fully stirred to form a transparent solution; add cetyltrimethylammonium bromide (CTAB) and dissolve in 5mL pentanol, 50mL cyclohexane mixed solution, and the concentration of cetyltrimethylammonium bromide is 2g / L; the mass ratio of the oil phase to the water phase is 15:1; the oil phase and the water phase are mixed evenly and fully stirred to form a microemulsion system;

[0045] The microemulsion system was transferred to a 150mL polytetrafluoroethylene-lined hydrothermal reactor for reaction, and reacted in an oven at 120°C for 12 hours, cooled naturally to room temperature, and centrifuged to obtain ZnMn 2 o 4 / Mn 2 o 3 The composite material precursor was washed several times with distilled water and absolute ethanol, and d...

Embodiment 2

[0049] Dissolve zinc nitrate and manganese acetate in 15mL distilled water at a molar ratio of 1:2.5, the concentration of zinc salt and manganese salt is 0.2mol / L, then add hexamethylenetetramine, hexamethylenetetramine and the system The molar ratio of total metal ions in the medium is 2:1, stir well to form a transparent solution; add polyvinylpyrrolidone (PVP) and dissolve in 4mL amyl alcohol, 20mL heptane mixed solution, and the concentration of polyvinylpyrrolidone is 0.2g / L; oil phase The mass ratio to the water phase is 5:1, and the oil phase and the water phase are mixed evenly and fully stirred to form a microemulsion system;

[0050] The microemulsion system was transferred to a 150mL polytetrafluoroethylene-lined hydrothermal reactor for reaction, and reacted in an oven at 200°C for 3 hours, cooled naturally to room temperature, and centrifuged to obtain ZnMn 2 o 4 / Mn 2 o 3 The composite material precursor was washed several times with distilled water and absol...

Embodiment 3

[0054] Dissolve zinc nitrate and manganese acetate in 10mL distilled water at a molar ratio of 1:20, the concentration of zinc salt and manganese salt is 1.5mol / L, then add dimethyl oxalate, dimethyl oxalate and total metal ions in the system The molar ratio is 20:1, stir well to form a transparent solution; add polyvinyl alcohol and dissolve in 5mL pentanol, 250mL hexane mixed solution, and the concentration of polyvinyl alcohol is 5g / L; the mass ratio of oil phase to water phase is 30 : 1, the oil phase and the water phase are mixed evenly and fully stirred to form a microemulsion system;

[0055] The microemulsion system was transferred to a 150mL polytetrafluoroethylene-lined hydrothermal reactor for reaction, and reacted in an oven at 80°C for 20 hours, cooled naturally to room temperature, and centrifuged to obtain ZnMn 2 o 4 / Mn 2 o 3 The composite material precursor was washed several times with distilled water and absolute ethanol, and dried under vacuum at 80°C fo...

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Abstract

The invention discloses a preparation method of composite spherical positive electrode materials for high-power aqueous zinc ion batteries. The preparation method includes dissolving zinc salt, manganese salt and homogeneous precipitation agents in distilled water, adding surfactants, cosurfactants and solvents, and evenly mixing and fully stirring oil phases and water phases to form microemulsionsystems; transferring the microemulsion systems to a hydrothermal reaction kettle lined with polytetrafluoroethylene to conduct reaction, putting the hydrothermal reaction kettle in an oven for 3-20hours of reaction at the temperature of 80-200 DEG C, naturally cooling the microemulsion systems to the room temperature, performing centrifugal separation to obtain composite material precursors, washing the composite material precursors by distilled water and absolute ethyl alcohol for multiple times, and drying the composite material precursors in vacuum at the temperature of 80 DEG C for 12 hours; calcinating the composite material precursors in an air atmosphere at a temperature rise speed of 2 DEG C / min and at the temperature of 550-800 DEG C for 3-20 hours, and naturally cooling the composite material precursors to the room temperature to obtain the positive electrode materials. The preparation method has the advantages that the manufacture cost is low, and the obtained batteries have high safety, high power and long cycle life.

Description

technical field [0001] The invention belongs to the field of new energy storage materials and energy storage technology, and relates to a substitute for a lead-acid battery, in particular to a method for preparing a composite spherical positive electrode material of a high-power water system zinc-ion battery. Background technique [0002] The assembly process of lithium-ion batteries / sodium-ion batteries using organic solutions as electrolytes is complex, harsh, and unsafe and environmentally friendly. The aqueous battery has the advantages of safety, non-toxicity, low cost, good rate performance, simple assembly process, etc., and has broad application prospects in the field of large-scale energy storage and power batteries. However, the available anode and cathode materials for aqueous batteries are extremely limited in the market. [0003] At present, in addition to flow batteries, there are two main types of aqueous batteries. One is that both positive and negative ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/366Y02E60/10
Inventor 吴贤文阳思念曾方红段荣琼阮巧云向延鸿吴显明何则强
Owner JISHOU UNIVERSITY