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Preparation method of silicon negative electrode material of lithium ion battery

A lithium-ion battery, silicon anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the performance of lithium-ion batteries, affecting electron and ion transport, etc., to achieve strong bonding, good controllability, Enhance the effect of bonding strength

Inactive Publication Date: 2018-08-17
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the oxide layer on the surface of silicon is an insulator, if the thickness is too large, it will affect the transmission of electrons and ions, and ultimately affect the performance of lithium-ion batteries.

Method used

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  • Preparation method of silicon negative electrode material of lithium ion battery

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Embodiment 1

[0021] The method for preparing a silicon negative electrode material of a lithium ion battery described in this embodiment specifically includes the following steps.

[0022] (1) Use acetone, hydrofluoric acid and ultrapure water to clean the silicon powder raw materials in sequence.

[0023] (2) Then put the cleaned silicon powder in 0.1 M AgNO 3 Stirring in a mixed solution with 1 M HF, the treatment time is 3min, and the solution temperature is 25℃.

[0024] (3) Finally, put the silicon powder after the above treatment in pure water for oxidation treatment, the water temperature is 90℃, and the treatment time is 60min. After the oxidation, the silicon powder is suction filtered and dried.

Embodiment 2

[0026] The method for preparing a silicon negative electrode material of a lithium ion battery described in this embodiment specifically includes the following steps.

[0027] (1) Use acetone, hydrofluoric acid and ultrapure water to clean the silicon powder raw materials in sequence.

[0028] (2) Then put the cleaned silicon powder in 0.05 M AgNO 3 It is stirred in the mixed solution of 2 M HF, the treatment time is 5 min, and the solution temperature is 40°C.

[0029] (3) Finally, put the silicon powder treated above into 1 M H 2 SO 4 The oxidation treatment is carried out in the aqueous solution, the solution temperature is 40°C, and the treatment time is 30 minutes. After the oxidation is completed, the silicon powder is suction filtered and dried.

Embodiment 3

[0031] The method for preparing a silicon negative electrode material of a lithium ion battery described in this embodiment specifically includes the following steps.

[0032] (1) Use acetone, hydrofluoric acid and ultrapure water to clean the silicon powder raw materials in sequence.

[0033] (2) Then put the cleaned silicon powder in 0.2 M AgNO 3 And 4 M HF mixed solution for stirring treatment, the treatment time is 3min, the solution temperature is 30℃.

[0034] (3) Finally, put the silicon powder after the above treatment in a vacuum furnace for oxidation treatment, the atmosphere in the furnace is Ar / O 2 Mixed gas, where Ar: O 2 = 95:5 (wt.%), the treatment temperature is 800℃, and the treatment time is 30min.

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Abstract

Disclosed is a preparation method of a silicon negative electrode material of a lithium ion battery. The preparation method comprises the following steps of (1) putting cleaned silicon powder into a mixed solution of metal salt and HF to be subjected to deposition treatment; and (2) finally, performing oxidization treatment on the surface metal modified silicon powder to form an oxide layer on thesurfaces, not covered with metal particles, of the silicon particles, wherein metal salt is silver nitrate, gold potassium chloride, potassium hexachloroplatinate or copper nitrate. By virtue of thepreparation method, conductivity of silicon powder can be improved, the combination strength between silicon particles and a binder can be reinforced, and the cycle performance of the silicon negativeelectrode material can be greatly improved; and in addition, the preparation method is simple in process, low in cost, very suitable for large-scale industrial production and expected to accelerate development of the silicon-based negative electrode material of the lithium ion battery.

Description

Technical field [0001] The invention belongs to the technical field of preparation of new energy materials. Background technique [0002] With the increasing demand of human beings and the rapid development of electric vehicles, lithium ion battery anode materials are required to have the characteristics of high capacity and rapid rate of charge and discharge. The theoretical capacity of existing graphite anode materials is 372 mAh / g, among which commercial graphite anode products have reached about 360 mAh / g, and there is basically no room for improvement. The theoretical capacity of silicon as a negative electrode material for lithium-ion batteries can reach about 4200mAh / g, and the content of silicon in the earth's crust is abundant, second only to oxygen, so it has become a research hotspot. However, the silicon material has a huge volume effect during the lithium storage process, about 300%, which will cause the active material to swell and break, pulverize and fall off fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 岳之浩周浪黄海宾李晓敏孙福根
Owner NANCHANG UNIV
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