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Metal lithium powder composite material and preparation method thereof, silicon-oxygen negative electrode and lithium ion battery

A lithium-ion battery and metal lithium powder technology, which is applied in metal lithium powder composite materials and its preparation, silicon-oxygen negative electrodes, and lithium-ion batteries, can solve problems that are not conducive to improving the first efficiency of silicon-oxygen battery systems and lithium powder pre-lithiation Problems such as poor material stability and difficulty in industrial application have achieved the effect of improving preparation safety, improving first-time efficiency, and improving application flexibility

Pending Publication Date: 2022-02-25
SHANGHAI CENAT NEW ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of metal lithium powder and preparation method thereof, and a kind of silicon-oxygen negative pole, a kind of lithium ion battery, aim at solving the poor stability of current lithium powder pre-lithiation material to a certain extent, its stability problem Improvement needs to be carried out under severe conditions such as high temperature, extremely low air and humidity, which has high environmental requirements, complicated operation, and difficult industrial application, which is not conducive to improving the first efficiency of silicon-oxygen battery systems.

Method used

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  • Metal lithium powder composite material and preparation method thereof, silicon-oxygen negative electrode and lithium ion battery
  • Metal lithium powder composite material and preparation method thereof, silicon-oxygen negative electrode and lithium ion battery

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preparation example Construction

[0035] as attached figure 1 As shown, the first aspect of the embodiments of the present invention provides a method for preparing a metal lithium powder composite material, comprising the following steps:

[0036] S10. Obtain the organic solution of metal lithium powder and fluorinating reagent;

[0037] S20. Under an inert atmosphere at a temperature of 0° C. to 90° C., the lithium metal powder and the organic solution of the fluorinating reagent are mixed and reacted to obtain a lithium metal powder composite material.

[0038] The preparation method of the lithium metal powder composite material provided by the first aspect of the present invention uses a fluorinating agent as a raw material for the stabilization treatment of the lithium metal powder, and directly mixes the lithium metal powder with the fluorinated lithium powder under an inert atmosphere at a temperature of 0°C to 90°C The organic solvent of the reagent is mixed and reacted, and the fluorine element in t...

Embodiment 1

[0060] A lithium metal powder composite material, comprising preparation steps:

[0061] 1) Ball milling of lithium powder: 5g of 500-mesh lithium powder was ball milled for 2 hours under an argon atmosphere;

[0062] 2) Preparation of mixed solution of n-hexane fluorinating reagent: add 90% n-hexane to a single-necked round bottom flask, then add 10% fluorinating reagent (perfluorotripropylamine), seal the obtained solution and put it in a refrigerator for storage.

[0063] 3) Preparation of stable lithium powder: Add 100g of the mixed solution of the above-mentioned fluorinating reagents, and then add 5g of ball-milled lithium powder into the prepared diluted solvent, under argon atmosphere, at a temperature of 23±3°C The reaction was stirred for 2h.

[0064] 4) Drying: The prepared stable lithium powder was washed with n-hexane for 3 times, and then dried in an oven in an argon atmosphere to obtain a highly stable metal lithium powder composite material.

Embodiment 2

[0066] A lithium metal powder composite material, comprising preparation steps:

[0067] 1) Ball milling of lithium powder: 5g of 400-mesh lithium powder was ball milled for 2 hours under an argon atmosphere;

[0068] 2) Preparation of n-hexane fluorinating reagent mixed solution: add 85% benzene to a single-necked round bottom flask, then add 15% fluorinating reagent (perfluorodecalin), seal the obtained solution and put it in a refrigerator for storage.

[0069] 3) Preparation of stable lithium powder: Add 100g of the mixed solution of the above-mentioned fluorinating reagents, and then add 5g of ball-milled lithium powder into the prepared diluted solvent, under argon atmosphere, at a temperature of 23±3°C The reaction was stirred for 4h.

[0070] 4) Drying: The prepared stable lithium powder was washed with n-hexane for 3 times, and then dried in an oven in an argon atmosphere to obtain a highly stable metal lithium powder composite material.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a metal lithium powder composite material, which comprises the following steps: obtaining an organic solution of metal lithium powder and a fluorinating reagent; and carrying out mixed reaction on the organic solution of metal lithium powder and a fluorinating reagent in an inert atmosphere at the temperature of 0-90 DEG C to obtain the metal lithium powder composite material. According to the preparation method of the metal lithium powder composite material, the preparation process is simple, the condition is mild, high-temperature calcination is not needed, water and oxygen are strictly controlled, the application flexibility of the preparation method is improved, and meanwhile the preparation safety is improved. The method has better application performance in the aspect of pre-lithiation reagents, can effectively improve the first effect of silicon-oxygen lithium ion batteries and the like, and does not affect the electrochemical performance of a battery system.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a metal lithium powder composite material and a preparation method thereof, a silicon-oxygen negative electrode for pre-lithiation by using the metal lithium powder composite material, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They have good economic benefits, social benefits, and strategic significance. They have become the most eye-catching green chemical power sources. [0003] Silicon anode materials have attracted much attention because of their ultra-high capacity and rate. The theoretical specific capacity of silicon materials can be as high as 4200mAh / g. However, the volume expansion and contraction of silicon materials during the lithium intercalation process of charging and discharging can re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/131H01M4/134H01M10/0525
CPCH01M4/382H01M4/628H01M4/131H01M4/134H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 胡春林
Owner SHANGHAI CENAT NEW ENERGY
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