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Method for preparing graphene coated protective metal lithium microspheres

A graphene-coated, metal lithium technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as unfavorable application of lithium-ion batteries, and achieve the effect of excellent electrical conductivity

Active Publication Date: 2019-08-30
上海泓昌新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Li2CO3 or LiF protective layer formed on the surface of the metal lithium powder is more stable than the metal lithium, it is still easy to react with water vapor in the air. At the same time, the Li2CO3 or LiF protective layer is electrically insulating. Favorable for its application in lithium-ion batteries

Method used

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  • Method for preparing graphene coated protective metal lithium microspheres
  • Method for preparing graphene coated protective metal lithium microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method for graphene-coated and protected metal lithium microspheres, comprising the steps of:

[0021] S1. Weigh 80-90mg of lithium metal, add it to 25-35ml of inert solvent, heat the lithium metal in the inert solvent to melt the lithium metal, and disperse it by high-shear stirring to make the molten lithium metal in the inert solvent Micron-sized particles are formed, and then the temperature is lowered to solidify the lithium metal to form a lithium metal microsphere dispersion;

[0022] S2. Weigh 50-60 mg of surface carboxyl-modified graphene after sanding treatment, add it to 25-35 ml of inert solvent, and then perform ultrasonic dispersion treatment for 5-10 minutes to form a uniform and stable graphene dispersion;

[0023] S3. Mix the metal lithium microsphere dispersion in step S1 and the graphene dispersion in step S2, fully stir for 30-40 minutes, filter and separate the inert solvent or evaporate and dry it to prepare graphene-coated and protec...

Embodiment 2

[0028] A preparation method for graphene-coated and protected metal lithium microspheres, comprising the steps of:

[0029] S1. Weigh 80-90mg of lithium metal, add it to 25-35ml of inert solvent, heat the lithium metal in the inert solvent to melt the lithium metal, and disperse it by high-shear stirring to make the molten lithium metal in the inert solvent Micron-sized particles are formed, and then the temperature is lowered to solidify the lithium metal to form a lithium metal microsphere dispersion;

[0030] S2. Weighing 50-60 mg of surface hydroxyl-modified graphene after sanding treatment, adding it to 25-35 ml of inert solvent, and then performing ultrasonic dispersion treatment for 5-10 minutes to form a uniform and stable graphene dispersion;

[0031] S3. Mix the metal lithium microsphere dispersion in step S1 and the graphene dispersion in step S2, fully stir for 30-40 minutes, filter and separate the inert solvent or evaporate and dry it to prepare graphene-coated a...

Embodiment 3

[0034] A preparation method for graphene-coated and protected metal lithium microspheres, comprising the steps of:

[0035] S1. Weigh 80-90mg of lithium metal, add it to 25-35ml of inert solvent, heat the lithium metal in the inert solvent to melt the lithium metal, and disperse it by high-shear stirring to make the molten lithium metal in the inert solvent Micron-sized particles are formed, and then the temperature is lowered to solidify the lithium metal to form a lithium metal microsphere dispersion;

[0036] S2. Weigh 50-60 mg of epoxy-modified graphene on the surface after sanding treatment, add it to 25-35 ml of inert solvent, and then perform ultrasonic dispersion treatment for 5-10 minutes to form a uniform and stable graphene dispersion;

[0037] S3. Mix the metal lithium microsphere dispersion in step S1 and the graphene dispersion in step S2, fully stir for 30-40 minutes, filter and separate the inert solvent or evaporate and dry it to prepare graphene-coated and pr...

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Abstract

The invention discloses a method for preparing graphene coated protective metal lithium microspheres. The method comprises steps that S1, metallic lithium is dispersed in inert solvent without activehydrogen to form metal lithium microsphere dispersion liquid; S2, the graphene having a surface functional group is dispersed in the inert solvent without the active hydrogen to form graphene dispersion liquid; S3, the metal lithium microsphere dispersion liquid of the step S1 and the graphene dispersion liquid of the step S2 are mixed and thoroughly stirred, the inert solvent is separated by filtration or evaporated for drying, and the graphene coating is utilized to protect the metal lithium microspheres. The method is advantaged in that the graphene is used as a protective layer of metalliclithium powder, the graphene protective layer has characteristics of high stability and excellent electrical conductivity, the preparation method further has properties of simple preparation processand easy enlargement, and products have controllable particle size and high stability.

Description

technical field [0001] The invention relates to the technical field of preparation of new energy materials, in particular to a method for preparing graphene-coated and protected metal lithium microspheres. Background technique [0002] The rapid development of personal consumer electronics and new energy vehicles has put forward higher and higher requirements for the energy density and cycle life of lithium-ion batteries. The loss of active lithium is one of the main reasons for the loss of lithium-ion battery capacity, mainly including the lithium consumed by the formation of solid electrolyte interface (SEI) film and the irreversible lithium embedded in the negative electrode material that is difficult to deintercalate, which also leads to the low coulombic efficiency of the battery for the first time. the direct cause of. If this part of active lithium loss can be supplemented by "lithium supplementation" technology, it will effectively improve the first effect, capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/382H01M4/628H01M4/625H01M10/0525Y02E60/10
Inventor 王沉濛孙淑华
Owner 上海泓昌新材料科技有限公司
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