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Zinc-copper negative electrode, preparation method thereof and zinc ion battery

A zinc-ion battery, zinc-copper technology, applied in electrode manufacturing, secondary batteries, circuits, etc., can solve the problems of poor stability and short cycle life of zinc-ion batteries

Inactive Publication Date: 2021-04-20
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a zinc-copper negative electrode to solve

Method used

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  • Zinc-copper negative electrode, preparation method thereof and zinc ion battery
  • Zinc-copper negative electrode, preparation method thereof and zinc ion battery
  • Zinc-copper negative electrode, preparation method thereof and zinc ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The present invention also provides a method for preparing a zinc-copper negative electrode 100, comprising the following steps:

[0041] Step S1: providing a zinc current collector 10; and

[0042] Step S2: Coating the copper film 30 on the zinc current collector 10 .

[0043]The thickness of the copper film 30 ranges from 1 μm to 15 μm. For example, it is 1 μm, 3 μm, 5 μm, 7 μm, 9 μm, 10 μm, 12 μm, 14 μm, or 15 μm.

[0044] In the technical solution of the present invention, since the copper film 30 covers the zinc current collector 10, in the process of charging and discharging, the dissolution of zinc and the deposition of zinc ions on the surface of the zinc current collector 10 will not be repeated, but It is to repeatedly deposit zinc ions and dissolve zinc on the surface of the copper film 30, and the morphology of the copper film 30 does not change, so that zinc dendrites will not be formed on the surface of the copper film 30, avoiding the formation of zinc ...

Embodiment 1

[0066] Provided at a concentration of 0.5mol L -1 copper sulfate solution;

[0067] Soak the zinc sheet (1.2 cm in diameter) in the copper sulfate solution for 10 seconds, then take it out, and rinse it with deionized water to obtain the zinc-copper negative electrode of Example 1;

[0068] Provide positive electrode, the concentration is 2mol L -1 Zinc sulfate aqueous solution, and glass fiber isolation film. Wherein, the positive electrode film of the positive electrode contains vanadium dioxide, acetylene black, and polytetrafluoroethylene, and the mass ratio of the three is 7:2:1;

[0069] The zinc-copper negative electrode, positive electrode, zinc sulfate aqueous solution, and glass fiber separator of Example 1 were assembled into the zinc-ion battery of Example 1.

[0070] figure 2 It is the voltage-time curve of the zinc ion battery of Example 1 under constant current conditions. where the current density is 0.5mA cm -2 , the deposition amount per circle is 0.5m...

Embodiment 2

[0077] Different from Example 1, the concentration of copper sulfate is 1mol L -1 .

[0078] Other steps are the same as those in Embodiment 1 and will not be repeated here.

[0079] Figure 5 It is the voltage-time curve of the zinc ion battery of Example 2 under constant current conditions. where the current density is 0.5mA cm -2 , the deposition amount per circle is 0.5mAh cm -2 . The results show that the zinc ion battery of Example 2 has better stability.

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Abstract

The invention discloses a zinc-copper negative electrode which comprises a zinc current collector and a copper film covering the zinc current collector. The invention also provides a preparation method of the zinc-copper negative electrode and a zinc ion battery applying the zinc-copper negative electrode. The zinc-copper negative electrode provided by the invention can improve the stability of the zinc ion battery and prolong the cycle life of the zinc ion battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a zinc-copper negative electrode, a method for preparing the zinc-copper negative electrode, and a zinc-ion battery using the zinc-copper negative electrode. Background technique [0002] Zinc-ion batteries have the advantages of short charging time, high energy density, good cycle attenuation performance, high specific capacity, simple preparation process, non-toxic environmental protection, and low cost, and have great application value and development prospects in the battery field. [0003] However, during the charging and discharging process of zinc-ion batteries, the surface of the zinc negative electrode is repeatedly depositing zinc ions and dissolving zinc. When the changed zinc negative electrode is placed on, zinc dendrites will be formed on the surface of the zinc negative electrode, and the zinc dendrites are easy to pierce the separator and cause a short circuit o...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M10/36
CPCY02E60/10
Inventor 徐成俊黄文婷康飞宇李佳
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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