Preparation method of electrode material for aqueous zinc ion hybrid energy storage device

A technology of hybrid energy storage and electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle life, and achieve the effects of low cost, good mechanical properties, and good conductivity

Active Publication Date: 2020-11-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcoming of poor cycle life of traditional Prussian blue materials and the problem of traditional zinc metal dendrites

Method used

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  • Preparation method of electrode material for aqueous zinc ion hybrid energy storage device
  • Preparation method of electrode material for aqueous zinc ion hybrid energy storage device
  • Preparation method of electrode material for aqueous zinc ion hybrid energy storage device

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preparation example Construction

[0042] Preparation of zinc / expanded graphite anode: self-made expanded graphite as working electrode, 1M zinc sulfate and 1M sodium sulfate aqueous solution as electrolyte, Ag / AgCl reference electrode, platinum foil as counter electrode, constant current is -50mAcm -2 , and the time is kept for 1800s. After the deposition is completed, it is repeatedly cleaned with deionized water and ethanol, and then dried at 50-90°C overnight.

[0043] image 3 Among them, the peak of 01S corresponds to the oxygen-containing functional groups of the expanded graphite substrate, which provides more active sites; while the peaks of C1S, N 1S, and Fe 2P correspond to Prussian blue, which proves the successful polymerization of Prussian blue on expanded graphite .

[0044] Figure 4 The charge-discharge cycle graph shown in Example 5, deposition of 50 cycles brought the highest capacity contribution and cycle stability. The reason is that at 50 cycles, the thickness of the deposited Prussian...

Embodiment 1

[0046] Self-made expanded graphite is used as the working electrode, a mixed solution of 0-1M potassium ferricyanide, 0-1M ferric chloride and 80-240 μL hydrochloric acid is used as the electrolyte, Ag / AgCl is used as the reference electrode, and platinum foil is used as the counter electrode , the scan speed is 45-55mV / s, the number of turns is 10 turns, and the voltage window is (0.1-0.5)-(0.6-1)V. After the deposition, it was washed repeatedly with deionized water and ethanol, and then dried overnight at 50-90°C.

[0047] The prepared Prussian blue / expanded graphite is directly used as the cathode, the 1-3M / L zinc sulfate aqueous solution is used as the electrolyte, and the prepared zinc / expanded graphite is directly used as the anode. After assembling into an aqueous battery, the current density is 0.1mA cm -2 Under the size of , its reversible capacity is 0.1mAh cm -2 .

Embodiment 2

[0049] Self-made expanded graphite is used as the working electrode, a mixed solution of 0-1M potassium ferricyanide, 0-1M ferric chloride and 80-240 μL hydrochloric acid is used as the electrolyte, Ag / AgCl is used as the reference electrode, and platinum foil is used as the counter electrode , the scan speed is 50mV / s, the number of turns is 20 turns, and the voltage window is (0.1-0.5)-(0.6-1)V. After the deposition, it was washed repeatedly with deionized water and ethanol, and then dried overnight at 50-90°C.

[0050] The prepared Prussian blue / expanded graphite is directly used as the cathode, the 1-3M / L zinc sulfate aqueous solution is used as the electrolyte, and the prepared zinc / expanded graphite is directly used as the anode. After assembling into an aqueous battery, the current density is 0.1mA cm -2, its reversible capacity is 0.12mAh cm -2 .

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Abstract

The invention relates to the field of electrode material preparation, and discloses a preparation method of an electrode material for an aqueous zinc ion hybrid energy storage device. The invention aims to overcome the defect of short cycle life of the conventional Prussian blue material and solve the problem of conventional zinc metal dendrites. According to the main scheme, the method comprisesthe steps: taking a graphite sheet as a substrate raw material, modifying the surface of graphite through an electrochemical micro-processing method, generating oxygen-containing functional groups, increasing the surface active sites, and then electrically depositing a Prussian blue nanoparticle compound on the graphite sheet through an electrochemical deposition technology to be directly used asa positive electrode material of the aqueous zinc ion energy storage device; depositing zinc nanosheets on the zinc nanosheets through electro-deposition to be directly used as a negative electrode. According to the invention, the electrochemical performance is excellent, the cycle life exceeds that of all electrode materials of the same type reported so far, and the zinc nanosheets are expected to become novel electrode materials of next-generation aqueous zinc ion energy storage devices.

Description

technical field [0001] The invention relates to the field of electrode material preparation, and specifically provides a method for preparing an electrode material of a water system secondary battery with high performance and long life. Background technique [0002] With the continuous aggravation of energy crisis and environmental pollution, a series of ecological problems need to be solved urgently. Therefore, the development of clean and recyclable renewable energy is imminent. To ensure the continuous supply of clean energy in the future and the continuous development of a large number of mobile electronic devices, lithium-ion batteries are considered to be one of the important milestones in the field of energy storage. However, many problems encountered in the development of lithium-ion batteries, such as poor cycle stability, low safety and high cost, limit the further development of lithium-ion batteries. Instead of lithium-ion batteries, aqueous zinc-ion batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/60H01M4/62H01M10/36C01B32/182
CPCC01B32/182H01M4/362H01M4/583H01M4/60H01M4/625H01M10/36Y02E60/10
Inventor 赵睿朱伟伟高小洪薛卫东孔坤伦张子栋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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