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Lithium silicon alloy material with surface modification layer, preparation method thereof, electrode and electrochemical energy storage device and negative electrode lithium-supplementing method

A technology of lithium-silicon alloy and surface modification, which is applied in the field of negative electrode materials and carbon material particles coated with low-melting point materials, can solve the problems of low efficiency, flammable and explosive, and difficult storage and transportation of silicon negative electrodes for the first time, and achieve The effect of improving the first charge and discharge efficiency

Active Publication Date: 2018-09-21
CHINA ENERGY LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of low initial efficiency of the silicon negative electrode, electrochemical pre-lithiation is mainly used in the industry, or lithium and silicon are reacted and pre-lithiated in an inert atmosphere. The prepared lithium-silicon alloy is very active, flammable and explosive, and not easy to store. transportation and handling

Method used

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  • Lithium silicon alloy material with surface modification layer, preparation method thereof, electrode and electrochemical energy storage device and negative electrode lithium-supplementing method
  • Lithium silicon alloy material with surface modification layer, preparation method thereof, electrode and electrochemical energy storage device and negative electrode lithium-supplementing method
  • Lithium silicon alloy material with surface modification layer, preparation method thereof, electrode and electrochemical energy storage device and negative electrode lithium-supplementing method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] First, metal lithium (Tianjin Zhongneng Lithium Industry Co., Ltd.) and silicon powder (Aladdin Reagent Company S108978-10g) are put into a reactor that is inert to metal lithium at a molar ratio of 4.4:1, and then heated. When the temperature reaches 300°C , start stirring, and stir for 3 hours to prepare a lithium-silicon alloy bulk material. The obtained alloy block was crushed (TYNSM-0.3L-B of Taoyue (Shanghai) Machinery Technology Co., Ltd.) to prepare lithium-silicon alloy powder particles with an average particle size of about 2 microns.

[0040] Example 1

[0041] Get 1g of the lithium-silicon alloy particles prepared in Synthesis Example 1 and disperse them in 100ml of n-hexane solution, then add 10ml of 0.1%wt octadecyl phosphoric acid (Alfa Aesar 020645) in tetrahydrofuran (Aladdin Reagent Co., Ltd. T103259) , stirred and reacted at room temperature for 10 minutes, filtered off the liquid after the stirring was completed, and dried the powder to obtain a lit...

Embodiment 2

[0046] Take 1 g of the lithium-silicon alloy powder particles prepared in Synthesis Example 1, pass through a sand mill to prepare particles with a particle size of 1 micron, disperse them in 100 ml of n-pentane (Aladdin Reagent Co., Ltd. P110847) solution, and then add 20ml of 0.1%wt PMMA (Aladdin Reagent Co., Ltd. P141442) tetrahydrofuran solution, after vigorous stirring, PMMA precipitates on the surface of the lithium-silicon alloy material. After filtering, washing and drying, the PMMA-lithium silicon alloy material is obtained.

Embodiment 3

[0048] Get 1g of the lithium-silicon alloy powder particles prepared in Synthesis Example 1, pass through a sand mill to prepare particles with a particle size of 1 micron, disperse them in 100ml of n-hexane (Aladdin Reagent Co., Ltd. H109657) solution, and then add 20ml 0.1% wt of paraffin (Aladdin Reagent Co., Ltd. P100930) n-hexane solution, kept stirring while heating and evaporating the solvent, the paraffin precipitated on the surface of the lithium-silicon alloy particles, and the paraffin-lithium-silicon alloy material was obtained.

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Abstract

The invention discloses a lithium silicon alloy material with a surface modification layer, a preparation method thereof, an electrode and an electrochemical energy storage device and a negative electrode lithium-supplementing method. The lithium-silicon alloy material is in the form of particles, the particle size of the particles is 0.1 to 50 micrometers, and the lithium-silicon alloy material comprises lithium-silicon alloy particles and a surface modification layer which covers the exposed surfaces of the lithium-silicon alloy particles. The outer layer of the surface modification layer isused for preventing the lithium-silicon alloy from coming into contact with the external environment, so that the lithium-silicon alloy can be stably stored and used in the dry air, and the reactionbetween the material and the electrolyte during the electrochemical cycle can be effectively prevented, and the cycle stability is improved; in addition, the lithium silicon alloy with the surface modification layer can be used as the negative electrode alone, the first efficiency of the battery can be improved, and can also be used as an additive in other negative electrodes without lithium element to supplement lithium and reduce the loss of effective lithium, and a lithium ion battery with high energy density is prepared.

Description

technical field [0001] The invention belongs to the technical field of energy batteries, and relates to a negative electrode material, in particular to a negative electrode material with carbon material particles coated with a low-melting point substance, its preparation method and application. Background technique [0002] Lithium-ion batteries have high energy density and good cycle stability, and have been widely used in portable electronic devices, electric vehicles and grid energy storage. However, at present, lithium-ion batteries mainly use graphite as the negative electrode, and the specific capacity limit of graphite-based negative electrode materials is about 372mAh / g. Based on this type of negative electrode materials, it is difficult to further improve the energy density of lithium-ion batteries, and it is difficult to adapt to the market demand for higher energy density. demand for lithium-ion batteries. [0003] The theoretical capacity of silicon is 4200mAh / g...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/40H01M4/583H01M4/587H01M4/48H01M4/485H01M4/62H01M4/131H01M4/133H01M4/134H01M10/052H01M10/0525H01M12/08
CPCH01M4/131H01M4/133H01M4/134H01M4/364H01M4/366H01M4/386H01M4/387H01M4/405H01M4/483H01M4/485H01M4/583H01M4/587H01M4/628H01M10/052H01M10/0525H01M12/08Y02E60/10
Inventor 王亚龙陈强牟翰波贾振勇
Owner CHINA ENERGY LITHIUM
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