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Preparation method and application of protective layer used for metal lithium anode

A metal lithium and protective layer technology, applied in battery electrodes, electrode carriers/current collectors, electrical components, etc., can solve the problems of metal lithium dendrites, etc., to improve electrical conductivity, reduce surface current density, and improve chemical stability. and the effect of mechanical strength

Active Publication Date: 2019-02-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of metal lithium producing dendrites, the present invention provides a preparation method and application of metal lithium negative electrode protective layer

Method used

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  • Preparation method and application of protective layer used for metal lithium anode
  • Preparation method and application of protective layer used for metal lithium anode
  • Preparation method and application of protective layer used for metal lithium anode

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Take 0.066g potassium ferricyanide and 0.9g PVP, add 50mL deionized water, add 0.1mL hydrochloric acid dropwise to the above solution, and stir at room temperature until completely dissolved;

[0030] (2) Wipe the exposed copper foil with alcohol cotton and then immerse it in the solution of step (1);

[0031] (3) placing the solution in step (2) in a 50°C oven for 60 minutes to obtain a copper foil current collector with a Prussian blue film on the surface;

[0032] (4) drop an aqueous solution containing graphene oxide onto the cleaned surface of the copper foil current collector in step (3), and dry at room temperature to obtain a graphene oxide / Prussian blue modified copper foil.

Embodiment 2

[0034] (1) Take 0.132g potassium ferricyanide and 0.9g PVP, add 50mL deionized water, add 0.1mL hydrochloric acid dropwise to the above solution, and stir at room temperature until completely dissolved;

[0035] (2) Wipe the exposed copper foil with alcohol cotton and then immerse it in the solution of step (1);

[0036] (3) placing the solution in step (2) in a 50°C oven for 60 minutes to obtain a copper foil current collector with a Prussian blue film on the surface;

[0037] (4) drop an aqueous solution containing graphene oxide onto the cleaned surface of the copper foil current collector in step (3), and dry at room temperature to obtain a graphene oxide / Prussian blue modified copper foil.

[0038] figure 1 is the SEM picture of the modified current collector prepared in this example, in figure 2 It can be seen that Prussian blue grows uniformly on the surface of the copper foil.

[0039] figure 2 SEM image of the graphene oxide / Prussian blue film prepared in this e...

Embodiment 3

[0042] (1) Take 0.660g potassium ferricyanide and 0.9g PVP, add 50mL deionized water, add 0.1mL hydrochloric acid dropwise to the above solution, and stir at room temperature until completely dissolved;

[0043] (2) Wipe the exposed copper foil with alcohol cotton and then immerse it in the solution of step (1).

[0044] (3) The solution of step (2) was placed in a 50° C. oven for 60 min to react to obtain a copper foil current collector with a Prussian blue film on the surface.

[0045] (4) drop an aqueous solution containing graphene oxide onto the cleaned surface of the copper foil current collector in step (3), and dry at room temperature to obtain a graphene oxide / Prussian blue modified copper foil.

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Abstract

The invention discloses a preparation method of a protective layer used for a metal lithium anode and application of the protective layer used for the metal lithium anode. The method comprises the following steps that 1, clean copper foil is immersed in a solution containing potassium ferricyanide, PVP and hydrochloric acid for reaction to obtain a copper foil current collector with a surface containing prussian blue film; 2, an aqueous solution containing graphene oxide is subjected to dispensing or spin-coating or self-assembly on the surface of the copper foil current collector obtained inthe step 1, and after room-temperature drying is conducted, a current collector with graphene oxide / prussian blue compound film is obtained. The current collector with the graphene oxide / prussian bluecompound film prepared through the method can be applied into the metal lithium anode. The graphene oxide / prussian blue compound current collector prepared through the method is beneficial for diffusion and transferring of lithium ions and electrons, metal lithium volume change and generation of lithium dendrites in charge and discharge processes are relieved, and dead lithium generation and diaphragm impaling are avoided, so that the recycling and rate performance of the metal lithium anode is improved.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method and application of a metal lithium negative electrode current collector, in particular to a method for growing a Prussian blue film on the surface of a metal lithium negative electrode copper foil current collector in situ, and then performing graphene oxide modification preparation method and application. Background technique [0002] With the rapid development of lithium-ion batteries in mobile devices and electric vehicles, people have higher and higher requirements for battery capacity, which in turn leads to higher requirements for battery materials. For carbon materials, which are currently the most successfully used anode materials for lithium-ion batteries, the capacity of carbon materials has been close to its theoretical capacity, but it is still difficult to meet the application requirements of electronic devices such as electric vehicles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/134H01M10/0525
CPCH01M4/134H01M4/661H01M4/667H01M10/0525Y02E60/10
Inventor 范立双郭志坤吴宪张乃庆孙克宁
Owner HARBIN INST OF TECH
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