An aqueous solution-based zinc-based battery cathode material, its preparation and application

A cathode material, zinc-based battery technology, applied in aqueous electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of low reversible capacity, low battery energy density, non-rechargeable limited application occasions, etc., to achieve high reversible capacity , high energy density, high reversible capacity and cycle stability

Active Publication Date: 2021-02-05
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since such cathode materials (such as MnO 2 , NiO and Co 3 o 4 ) is based on the conversion reaction mechanism and can achieve high discharge capacity, but its non-rechargeability severely limits its application
At the same time, in aqueous zinc-based secondary batteries, most of the reported positive electrode materials (vanadate and polymer) are mainly based on the embedded reaction mechanism, but they generally have low reversible capacity (-1 ) problem, resulting in low energy density of the battery (-1 )

Method used

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  • An aqueous solution-based zinc-based battery cathode material, its preparation and application
  • An aqueous solution-based zinc-based battery cathode material, its preparation and application
  • An aqueous solution-based zinc-based battery cathode material, its preparation and application

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preparation example Construction

[0044]The present invention also provides a method for preparing the positive electrode material. After the active material and the conductive material are mixed, they are heated to 50-500° C. under vacuum airtight conditions to obtain the positive electrode material.

[0045]The above-mentioned cathode material provided by the present invention can be used as a cathode material for aqueous zinc-based batteries. In particular, it can be used as a cathode material for rechargeable aqueous zinc-based batteries, which can release ultra-high reversible capacity and exert its high energy density performance.

[0046]The present invention also provides a zinc-based battery based on an aqueous solution, which includes a positive electrode material, a negative electrode material, and an electrolyte, wherein the positive electrode material is the composite of the active material and the conductive material as described above, and the negative electrode material and electrolyte are based on the aqu...

Embodiment 1

[0049]Weigh 1.0g sulfur powder and 1.0g carbon nanotubes (pore diameter 50nm, specific surface area 543m2g-1), grind and mix in an agate mortar for 30 minutes, then vacuum-sealed in a quartz tube, and then heat to 160°C for 24 hours. After cooling, the elemental sulfur and carbon nanotube composite material in this embodiment is cooled.

[0050]Weigh the above-mentioned composite material and PTFE according to a mass ratio of 8:2, mix them in isopropanol, and then roll them into a film with a pair of rollers, cut them into discs with a diameter of 8mm, and press them on a titanium mesh. electrode. The obtained electrode was used as the positive electrode, and the zinc sheet was used as the negative electrode. 1mol / L Zn(CH3COO)2As the electrolyte, the button cell is assembled to test its electrochemical performance. The charge-discharge curve is asfigure 1 Shown.

[0051]figure 1 Shows that the prepared electrode is 0.05Ag-1The current density is 0.05-1.6V(vs.Zn2+ / Zn) charge and discharge ...

Embodiment 2

[0053]Weigh 1.0g sulfur powder and 1.0g activated carbon (particle size 5μm, specific surface area 1623m2g-1), after grinding and mixing in an agate mortar for 30 minutes, then vacuum sealing in a quartz tube, then heating to 160° C. for 24 hours, and cooling to obtain the elemental sulfur and activated carbon composite material in this example.

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Abstract

The invention belongs to the field of aqueous solution zinc-based batteries, and more specifically relates to an aqueous solution-based zinc-based battery cathode material, its preparation and application. The active material is elemental iodine, chalcogenide elements or compounds formed by chalcogenide elements; the conductive material is conductive and has a porous structure; wherein the conductive material not only plays a conductive role, but also utilizes its porous structure It can absorb or coat the active material, and prevent the active material from being dissolved and invalidated. It is used as a positive electrode material for zinc-based batteries based on aqueous solutions, especially as a positive electrode material for rechargeable aqueous zinc-based batteries, with high reversible capacity, energy density and cycle stability.

Description

Technical field[0001]The present invention belongs to the field of aqueous zinc-based batteries, and more specifically, relates to an aqueous solution-based zinc-based battery cathode material, preparation and application thereof.Background technique[0002]Aqueous zinc-based batteries are a type of aqueous batteries that use metallic zinc as the negative electrode material. They have attracted much attention due to their low cost, safety, reliability, cleanliness and environmental protection.[0003]According to the rechargeability of the battery, aqueous zinc-based batteries can be divided into aqueous zinc-based primary batteries and aqueous zinc-based secondary batteries. In aqueous zinc-based primary batteries (such as remote control dry batteries), the cathode material is mainly transition metal oxides (such as MnO2, NiO and Co3O4). Because this type of cathode material (such as MnO2, NiO and Co3O4) Is based on the conversion reaction mechanism, which can achieve higher discharge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M6/04H01M10/36
CPCY02E60/10
Inventor 蒋凯李威王康丽程时杰
Owner HUAZHONG UNIV OF SCI & TECH
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