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Lithium ion battery negative electrode and preparation method thereof

A technology of lithium ion battery and negative electrode, applied in the field of lithium ion battery negative electrode and its preparation, can solve the problems of peeling, reduction of negative electrode active material, pulverization of active material, etc., and achieves stable performance, large reaction area and good electrochemical reaction. Effect

Active Publication Date: 2019-09-06
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative active material is soaked in the binder for a long time, which is easy to cause the active material to powder, peel off, and dissolve in the binder, so that the negative active material that can participate in the charge and discharge reaction is reduced, resulting in an irreversible loss of the charge and discharge capacity of the lithium-ion battery.

Method used

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  • Lithium ion battery negative electrode and preparation method thereof
  • Lithium ion battery negative electrode and preparation method thereof
  • Lithium ion battery negative electrode and preparation method thereof

Examples

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preparation example Construction

[0041] Please refer to image 3 , the present invention also provides a kind of preparation method of above-mentioned negative electrode of lithium ion battery, comprises the steps:

[0042] A stainless steel sheet is used as the substrate 1;

[0043] To clean the stainless steel sheet, the cleaning agent is at least one of acetone or ethanol;

[0044] A Ti layer 2 with a thickness of 80-120 nm is provided on the stainless steel sheet by magnetron sputtering;

[0045] A nanowire array of Ni material is deposited as an electrode film layer 3 on the substrate 1 provided with a Ti layer 2 by electron beam evaporation; Depositing on the substrate 1 at a grazing angle, the angle θ of the grazing angle deposition is 8-15 degrees; the deposition rate of the Ni nanowire array is 0.25-0.35nm·s -1 , the deposition thickness on the substrate 1 is 450-550nm;

[0046] Move the substrate 1 deposited with the Ni material nanowire array to the selenization chamber 4;

[0047] Put 3-4g of...

Embodiment 1

[0052] This embodiment provides a method for preparing a negative electrode of a lithium ion battery, comprising the following steps:

[0053] A stainless steel sheet is used as the substrate 1; in the present embodiment, a square stainless steel sheet with a side length of 1 cm is preferred;

[0054] To clean the stainless steel sheet, the cleaning agent is acetone;

[0055] A Ti layer 2 with a thickness of 80 nm is set on the stainless steel sheet by magnetron sputtering;

[0056]A nanowire array of Ni material is deposited as an electrode film layer 3 on the substrate 1 provided with a Ti layer 2 by electron beam evaporation; Deposited on the substrate 1 at a grazing angle, the angle θ of the grazing angle deposition is 8 degrees; the deposition rate of the Ni nanowire array is 0.25nm·s -1 , the deposition thickness on the substrate 1 is 450nm;

[0057] Move the substrate 1 deposited with the Ni material nanowire array to the selenization chamber 4;

[0058] Put the Se ...

Embodiment 2

[0063] The present invention also provides a method for preparing the negative electrode of the lithium ion battery, comprising the steps of:

[0064] A stainless steel sheet is used as the substrate 1; in the present embodiment, a square stainless steel sheet with a side length of 2 cm is preferred;

[0065] To clean the stainless steel sheet, the cleaning agent is ethanol;

[0066] A 120nm thick Ti layer 2 is provided on the stainless steel sheet by magnetron sputtering;

[0067] A nanowire array of Ni material is deposited as an electrode film layer 3 on the substrate 1 provided with a Ti layer 2 by electron beam evaporation; Deposited on the substrate 1 at a grazing angle, the angle θ of the grazing angle deposition is 15 degrees; the deposition rate of the Ni nanowire array is 0.35nm·s -1 , the deposition thickness on the substrate 1 is 550nm;

[0068] Move the substrate 1 deposited with the Ni material nanowire array to the selenization chamber 4;

[0069] Put the Se...

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Abstract

The invention discloses a lithium ion battery negative electrode. The lithium ion battery negative electrode comprises a base, wherein an electrode film is deposited on the base; and the electrode film is of a nanowire array structure. The electrode film of the nanowire array structure is deposited and generated on the base by using electron beam evaporation, the electrode film can be firmly adhered onto the base material without using an adhesive, and the influence of the adhesive on the performance of a negative electrode active material is avoided. The invention also provides a preparationmethod of the lithium ion battery negative electrode.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] With the widespread application of lithium-ion batteries in people's daily life, many universities, research institutions, and enterprises have invested in the research and development of new technologies for lithium-ion batteries. Committed to improving the specific capacity and cycle life of lithium-ion batteries. [0003] The negative electrode of lithium-ion batteries is one of the factors that play a decisive role in battery performance, and the performance of battery negative electrodes made of different materials varies greatly. Experiments found that using NiSe 2 The discharge specific capacity of the lithium-ion battery with the material as the negative electrode can reach 800mAh·g -1 , much higher than the currently widely used LiFePO 4 (170mAh·g -1 ),...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/04H01M4/58H01M10/0525C01B19/00B82Y30/00B82Y40/00
CPCH01M4/136H01M4/1397H01M4/0423H01M4/0426H01M4/049H01M4/581H01M10/0525C01B19/007B82Y30/00B82Y40/00C01P2006/40Y02E60/10
Inventor 王佳莹王志明余鹏马翠苹童鑫林峰巫江
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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