Lithium metal negative electrode and preparation method and application thereof

A lithium metal negative electrode and reaction technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of inability to accommodate volume expansion, inability to disperse lithium dendrite tip current, etc.

Active Publication Date: 2021-06-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Coating the buffer layer to protect the lithium metal negative electrode and the buffer layer material grown in situ on the negative electrode material do not have the function of elasticity, so the buffer layer material cannot accommodate large particles such as the accumulation of "dead lithium" during the long-term cycle. The volume expansion caused by the deformation of the negative electrode, and then the buffer layer material cannot continue to contact lithium metal to play a functional role; and the coated buffer layer and the in-situ grown buffer layer material are generally non-conductive high polymers, although they can promote lithium ions. Transmission, with a high elastic modulus to enhance the mechanical strength of the negative electrode, but it cannot disperse the lithium dendrite tip current and inhibit the dendrite growth

Method used

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  • Lithium metal negative electrode and preparation method and application thereof
  • Lithium metal negative electrode and preparation method and application thereof
  • Lithium metal negative electrode and preparation method and application thereof

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preparation example Construction

[0026] The process flow for preparing metal lithium negative electrode provided by the embodiment of the present invention is as follows: figure 1 shown.

[0027] The invention provides a method for preparing a lithium metal negative electrode, comprising:

[0028] After mixing the melamine foam and the aniline solution, let it stand to obtain a mixed solution;

[0029] reacting the mixed solution with ammonium persulfate to obtain a reaction product;

[0030] The reaction product and the lithium foil are rolled and combined to obtain a metal lithium negative electrode.

[0031] In the present invention, the melamine foam is preferably a sheet. In the present invention, the thickness of the melamine foam is preferably 1.8-2.5 mm, more preferably 2-2.2 mm. In the present invention, the melamine foam is preferably melamine-formaldehyde resin, preferably formed by the reaction of formaldehyde and melamine, and the porosity is preferably above 99.9%. In the present invention,...

Embodiment 1

[0055] Take 30 pieces of melamine foam with a thickness of about 1.8mm, an area of ​​3*4cm, and a total mass of 0.69g. Use acetone and alcohol to ultrasonically clean them for 30 minutes, then place them in a blast desiccant at 60°C for later use, and weigh 3.70 pieces with an analytical balance. 1g of aniline is dispersed in 280mL of 1moL / mL hydrochloric acid solution, melamine foam is added, and left to stand in an ice bath for 4 hours; 4.10g of ammonium persulfate is weighed with an analytical balance and added to the mixed hydrochloric acid solution of melamine foam and aniline , fully dissolved, and left to react under ice bath conditions for 8 hours; the elastic buffer layer material prepared after the reaction was taken out from the hydrochloric acid, and washed with deionized water several times to remove the excess and over-reacted melamine foam skeleton surface. The polyaniline particles were then dried in a blast oven at 60°C for later use.

[0056] The dried elasti...

Embodiment 2

[0060] 20 pieces of melamine foam with a thickness of about 1.8mm, an area of ​​5*6cm, and a total mass of 1.38g were ultrasonically cleaned with acetone and alcohol for 30 minutes, then dried in a blast desiccant at 60°C for later use, and weighed 7.45 with an analytical balance. G of aniline was dispersed in 550mL of 1moL / mL hydrochloric acid solution, melamine foam was added, and the mixture was allowed to stand in an ice bath for 5 hours. Weigh 8.28g of ammonium persulfate with an analytical balance and add it to the mixed hydrochloric acid solution of melamine foam and aniline, fully dissolve, and let it stand for 10 hours under ice bath conditions. Take out the elastic buffer layer material prepared after the reaction from the hydrochloric acid, wash it with deionized water several times, wash off the surface of the melamine foam skeleton, and place the excess and over-reacted polyaniline particles in a blast oven at 60°C for later use. .

[0061] Cut the dry elastic bu...

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Abstract

The invention provides a preparation method of a lithium metal negative electrode, and the method comprises the following steps: mixing melamine foam and an aniline solution, and standing to obtain a mixed solution; reacting the mixed solution with ammonium persulfate to obtain a reaction product; and rolling and compounding the reaction product and a lithium foil to obtain the metal lithium negative electrode. The in-situ buffer layer material prepared by the method provided by the invention has relatively strong mechanical modulus, the fiber layer with weak conductivity can disperse high current density at the tip of dendritic crystal, inhibit dendritic crystal growth and homogenize lithium ion concentration when the dendritic crystal is in contact with the fiber, and meanwhile, the elastic expandable buffer layer material has a larger reserved space, and a large amount of accumulated dead lithium can be bound to adapt to volume expansion. The invention also provides a lithium metal negative electrode and application thereof.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium metal negative electrode and a preparation method and application thereof. Background technique [0002] As people rely on the use of energy storage devices, human life is inseparable from the benefits brought by energy storage devices. At the same time, the requirements for the energy density of energy storage devices are getting higher and higher, ranging from small digital devices to large new ones. Energy vehicle power battery. Due to the high theoretical specific capacity of lithium metal, in order to increase the energy density of the battery, lithium metal batteries have gradually entered people's field of vision, but the growth of lithium dendrites in lithium metal batteries brings a series of side reactions, including electrolyte The consumption of lithium and the generation of "dead lithium" will reduce the cycle life and reversible capacity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M4/38H01M10/0525
CPCH01M4/382H01M10/0525H01M4/134H01M4/1395H01M2004/027Y02E60/10
Inventor 胡志远邓伟周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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