Aqueous zinc ion battery based on manganese dioxide/graphene and preparation method

A zinc-ion battery, manganese dioxide technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of large internal resistance of the battery, shedding of active materials, and large contact resistance of the positive electrode, so as to improve battery performance and prolong battery life. Life, the effect of reducing contact resistance

Active Publication Date: 2020-01-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, the current manganese dioxide-zinc ion battery also has some shortcomings, such as the combination of the positive electrode active material and the base current collector is not tight, which makes the positive electrode contact resistance larger, The internal resistance of the battery is large, which affects the performance of the battery
At the same time, due to the large volume of zinc ions inserted and extracted, the lattice of the positive electrode material will collapse after repeated charging and discharging, and in addition, a part of the positive electrode active material manganese dioxide will dissolve into the electrolyte during charging and discharging, so in The active material is easy to fall off from the substrate at the end of the battery cycle, which reduces the battery cycle life

Method used

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  • Aqueous zinc ion battery based on manganese dioxide/graphene and preparation method
  • Aqueous zinc ion battery based on manganese dioxide/graphene and preparation method
  • Aqueous zinc ion battery based on manganese dioxide/graphene and preparation method

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Embodiment 1

[0021] (1) Preparation of carbon nanotube fiber substrate: Synthesize vertically oriented spinnable multi-walled carbon nanotube arrays by chemical vapor deposition, and then pull out the carbon nanotubes for 5 strands of twisting and stranding, and then twist the strands after twisting Ethanol is uniformly dropped on the carbon nanotube fiber for shaping, and after the ethanol is completely volatilized, the preparation of the carbon nanotube fiber substrate is completed.

[0022] (2) Preparation of graphene oxide dispersion: 500-mesh graphite powder was thermally expanded at 1000 degrees Celsius for 10 seconds by the expanded graphite method to obtain expanded graphite. The obtained expanded graphite powder is pre-oxidized to obtain pre-oxidized graphene. Afterwards, the pre-oxidized graphene was further oxidized, and the pre-oxidized graphene was added to concentrated sulfuric acid under ice-bath conditions, and potassium permanganate was slowly added to stir the reaction fo...

Embodiment 2

[0028] (1) Preparation of graphene oxide dispersion: 400-mesh graphite powder was thermally expanded at 1000 degrees Celsius for 12 seconds by the expanded graphite method to obtain expanded graphite. The obtained expanded graphite powder is pre-oxidized to obtain pre-oxidized graphene. Afterwards, the pre-oxidized graphene was further oxidized, and the pre-oxidized graphene was added to concentrated sulfuric acid under ice-bath conditions, and potassium permanganate was slowly added to stir the reaction for 3 hours. Then add a large amount of water and a small amount of hydrogen peroxide solution, and finally filter, wash and dilute the product to obtain a graphene oxide dispersion.

[0029] (2) Preparation of manganese dioxide / reduced graphene oxide fibrous positive electrode: take a section of carbon fiber as substrate, graphene oxide dispersion as electrodeposition solution, graphite rod as counter electrode, and saturated calomel electrode as reference electrode, at -1.2 ...

Embodiment 3

[0034] (1) Preparation of carbon nanotube fiber substrate: Synthesize vertically oriented spinnable multi-walled carbon nanotube arrays by chemical vapor deposition, and then pull out the carbon nanotubes for 10 strands of twisting and stranding, and then in the twisted Ethanol is uniformly dropped on the carbon nanotube fiber for shaping, and after the ethanol is completely volatilized, the preparation of the carbon nanotube fiber substrate is completed.

[0035] (2) Preparation of graphene oxide dispersion: 300-mesh graphite powder was thermally expanded at 800 degrees Celsius for 15 seconds by the expanded graphite method to obtain expanded graphite. The obtained expanded graphite powder is pre-oxidized to obtain pre-oxidized graphene. Afterwards, the pre-oxidized graphene was further oxidized, and the pre-oxidized graphene was added into concentrated sulfuric acid under ice bath conditions, and potassium permanganate was slowly added to stir the reaction for 4 hours. Then...

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Abstract

The invention belongs to the technical field of zinc ion batteries and relates to an aqueous zinc ion battery based on manganese dioxide/graphene and a preparation method. According to the zinc ion battery, carbon nanotube fiber uniformly loaded with a manganese dioxide/reduced graphene oxide composite material is used as a positive electrode, a fibrous zinc wire is used as a negative electrode; and the surfaces of the two electrodes are uniformly coated with a gel electrolyte, and then the two electrodes are mutually wound to form a winding structure. The preparation method comprises the following steps of: the preparation of a graphene oxide dispersion liquid; the preparation of a fibrous manganese dioxide/reduced graphene oxide positive electrode; and the assembly of a fibrous aqueous rechargeable zinc ion battery. The manganese dioxide/reduced graphene oxide composite material has a three-dimensional reticular frame structure with high conductivity, and therefore, the contact areaof a current collector and an active substance can be increased, contact resistance can be reduced, the performance of the fibrous battery can be improved, and the service life of the fibrous batterycan be prolonged. With the fiber battery woven into a fabric, wearable electronic equipment with excellent performance can be prepared.

Description

technical field [0001] The invention belongs to the technical field of zinc ion batteries, and in particular relates to a water system rechargeable zinc ion battery and a preparation method thereof. Background technique [0002] With the rapid development of the world economy, people's demand for energy is also increasing. In order to meet this escalating energy demand, the development of new energy storage systems has gradually become the focus of research by scientists from various countries [1] . Lithium-ion batteries are currently one of the most widely used types of batteries due to the light weight of lithium and the high energy density of the battery system. However, lithium-ion batteries also have great disadvantages. First, the shortage of lithium resources makes the cost of batteries higher. Secondly, the organic electrolytes used in batteries are usually toxic and flammable, which brings huge challenges to the use of lithium-ion batteries. security issues [2] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/38H01M4/587H01M4/505
CPCH01M10/36H01M10/38H01M4/505H01M4/587Y02E60/10Y02P70/50
Inventor 彭慧胜王佳玮廖萌
Owner FUDAN UNIV
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