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Negative electrode active material used for lithium battery and preparation method of negative electrode active material

A negative electrode active material and lithium battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of material structure damage, cycle performance deterioration, loss of electrical contact, etc., to speed up de-embedding and embedding, Improve charge and discharge performance, increase the effect of ion conductivity

Active Publication Date: 2018-04-20
INNER MONGOLIA HENGKE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large volume change (about 300%) associated with the lithium-deintercalation reaction, the material structure is destroyed and mechanically pulverized, resulting in the separation between the electrode materials and the electrode material and the current collector, and then the loss of electrical contact, resulting in rapid capacity decay. Deterioration of cycle performance

Method used

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  • Negative electrode active material used for lithium battery and preparation method of negative electrode active material

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Effect test

Embodiment 1

[0026] A preparation method for a negative electrode active material for a lithium battery:

[0027] (1) Disperse 100g of iron powder, 200g of silicon powder and 500g of graphene powder into 2kg of deionized water, and ultrasonically treat it for 40min at a frequency of 100KHz to form a uniform mixed solution; Liquid nitrogen is loaded at the bottom of the container, and the water in the dispersion liquid is quickly frozen into ice to form a mixture of iron, silicon, graphene and ice. The mixture is placed in a freeze dryer and dried at -100°C for 15 hours to obtain a mixed powder;

[0028] Then transfer it to the negative electrode mold, pressurize 40Mpa at a temperature of 1000°C in a vacuum environment, keep it warm for 60min, then continue to heat up to 1400°C, keep it warm for 180min, and get the negative electrode template;

[0029] (2) Submerge the negative electrode template in step (1) into a hydrochloric acid solution for 5 hours, replace the soaking solution every ...

Embodiment 2

[0034] A preparation method for a negative electrode active material for a lithium battery:

[0035] (1) Disperse 100g copper powder, 200g silicon powder and 600g graphene powder into 2kg deionized water, and ultrasonically treat it for 30min at a frequency of 40KHz to form a uniform mixed solution; Liquid nitrogen is loaded at the bottom of the container, and the water in the dispersion liquid is quickly frozen into ice to form a mixture of copper, silicon, graphene and ice. The mixture is placed in a freeze dryer and dried at -90°C for 12 hours to obtain a mixed powder;

[0036] Then transfer it to the negative electrode mold, pressurize 35Mpa at a temperature of 1000°C in a vacuum environment, keep it warm for 25 minutes, then continue to heat up to 1400°C, keep it warm for 40 minutes, and get the negative electrode template;

[0037] (2) Submerge the negative electrode template in step (1) into a hydrochloric acid solution for 3 hours, replace the soaking solution every 4...

Embodiment 3

[0042] A preparation method for a negative electrode active material for a lithium battery:

[0043](1) Disperse 100g aluminum powder, 150g silicon powder and 500g graphene powder into 2kg deionized water, and ultrasonically treat it for 50min at a frequency of 120KHz to form a uniform mixed solution; Liquid nitrogen is loaded at the bottom of the container, and the water in the dispersion liquid is quickly frozen into ice to form a mixture of aluminum, silicon, graphene and ice. The mixture is placed in a freeze dryer and dried at -85°C for 20 hours to obtain a mixed powder;

[0044] Then transfer it to the negative electrode mold, pressurize 45Mpa at a temperature of 1000°C in a vacuum environment, keep it warm for 80min, then continue to heat up to 1400°C, keep it warm for 150min, and get the negative electrode template;

[0045] (2) Submerge the negative electrode template in step (1) into a hydrochloric acid solution for 10 hours, replace the soaking solution every 40 mi...

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Abstract

The invention belongs to the technical field of a new energy negative electrode material of a lithium battery, and specifically relates to a negative electrode active material used for a lithium battery and a preparation method of the negative electrode active material. The preparation method comprises the steps of (1) enabling metal powder, silicon powder and graphene powder to be dispersed intodeionized water, and performing freezing and drying, and hot pressing and sintering to obtain a negative electrode template; (2) performing acid washing and washing until the liquid is neutral; (3) performing soaking in a processing liquid and drying; and (4) depositing a diamond coating layer on the surface of the negative electrode template to obtain the negative electrode material of the lithium battery. According to the negative active material used for the lithium battery provided by the invention, a silicon powder-doped graphene framework is adopted for suppressing volume change of the negative electrode material in the charging-discharging process; the diamond coating layer is deposited on the outer side of the graphene framework; and by virtue of matching of the external rigid diamond coating layer and the internal flexible graphene framework, the volume effect of the silicon-based material is reduced, and pulverization and stripping of the negative electrode material caused bysilicon particle volume expansion or contraction can be prevented.

Description

technical field [0001] The invention belongs to the technical field of new energy lithium battery negative electrode materials, and specifically relates to a negative electrode active material for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries play an important role in the mobile electronics market due to their high energy and power density. After the expansion of research technology and application fields in recent years, lithium-ion batteries have begun to move towards diversification. They are used in electric vehicles and energy storage power stations. There is also a huge demand in other fields. [0003] Currently widely used graphite-based anode materials have low lithium storage capacity, and the actual specific capacity is already close to the theoretical value of 372mAh / g, so it is difficult to have room for improvement. Moreover, the potential of lithium intercalation is close to that of metal lithium, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/386H01M4/628H01M10/052Y02E60/10
Inventor 汪涛
Owner INNER MONGOLIA HENGKE NEW MATERIAL TECH CO LTD
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