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A kind of pre-lithiated composite negative electrode sheet and its preparation method and application

A technology of pre-lithiation and negative electrode sheet, which is applied in the field of pre-lithiation composite negative electrode sheet and its preparation, can solve the problems of low first efficiency of negative electrode materials, achieve high production efficiency, simple process flow, and good industrial application prospects

Active Publication Date: 2022-05-17
EVE ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the problems existing in the prior art, the purpose of the present invention is to provide a pre-lithiated composite negative electrode sheet and its preparation method and application. The preparation method of the pre-lithiated composite negative electrode sheet solves the problem of negative electrode materials by providing an external lithium source. The problem of low first effect and the provision of lithium source required by the battery improve the capacity and cycle performance of the battery, the process is simple, safe, high production efficiency, and has a good industrial application prospect

Method used

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  • A kind of pre-lithiated composite negative electrode sheet and its preparation method and application
  • A kind of pre-lithiated composite negative electrode sheet and its preparation method and application
  • A kind of pre-lithiated composite negative electrode sheet and its preparation method and application

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[0066] The specific embodiment of the present invention provides a pre-lithiated composite negative electrode sheet and its preparation method and application. The preparation method includes the following steps:

[0067] (1) Prepressing the negative electrode sheet, lithium foil and release film to obtain a composite semi-finished product 3;

[0068] The negative pole piece is located between two lithium foils, and the two lithium foils are located between two release films;

[0069] (2) Rolling the composite semi-finished product 3 obtained in step (1) to obtain a pre-lithiated composite negative electrode sheet 5 .

[0070] The pre-lithiated composite negative electrode sheet is a pre-lithiated composite negative electrode sheet obtained by the above preparation method.

Embodiment 1

[0073] This embodiment provides a pre-lithiated composite negative electrode sheet and its preparation method, the structural diagram of the device used in the preparation method is as follows figure 1 As shown, wherein, the release film unwinding shaft 1, the pre-pressing device 2 and the roller device 4 are connected in sequence.

[0074] The preparation method comprises the following steps:

[0075] (1) Preparation of negative electrode pole piece: artificial graphite, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed with water according to a mass ratio of 90:5:2.5:2.5 to obtain negative electrode slurry; the obtained negative electrode The slurry is coated on both sides of the copper foil, and then sequentially dried, rolled and cut to obtain a negative electrode sheet with a thickness of 200 μm;

[0076] In the positioning area of ​​the pre-pressing device 2, the negative pole piece, the lithium foil with a thickness of 30 μm...

Embodiment 2

[0080] This embodiment provides a pre-lithiated composite negative electrode sheet and a preparation method thereof, the preparation method comprising the following steps:

[0081] (1) Preparation of negative electrode pole piece: artificial graphite, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed with water according to a mass ratio of 92:5:1.5:1.5 to obtain negative electrode slurry; the obtained negative electrode The slurry is coated on the copper foil on both sides, and then sequentially dried, rolled and cut to obtain a negative electrode sheet with a thickness of 500 μm;

[0082] In the positioning area of ​​the pre-pressing device 2, the negative pole piece, the lithium foil with a thickness of 200 μm and the release film are arranged, the negative pole piece is located between two lithium foils, and the two lithium foils are located Between the two release films, the area ratio of the lithium foil to the negative electro...

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Abstract

The invention provides a pre-lithiated composite negative electrode sheet and its preparation method and application. The preparation method of the pre-lithiated composite negative electrode sheet includes: pre-pressing the negative electrode sheet, lithium foil and release film to obtain a composite semi-finished product The negative electrode sheet is located between two lithium foils, and the two lithium foils are located between two release films; the obtained composite semi-finished product is rolled to obtain a pre-lithiated composite negative electrode sheet. The preparation method of the present invention solves the problems of low cycle life of the lithium secondary battery using metal lithium as the negative electrode and low first effect of the negative electrode material by providing an external lithium source, improves the capacity and cycle performance of the battery, and has a simple process flow. Safety, high production efficiency, and good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to a pre-lithiated composite negative electrode sheet and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have received extensive attention due to their high energy density and good cycle performance. With the popularization of mobile Internet devices, the promotion of electric vehicles and other electric vehicles, and the development of aerospace technologies such as drones and space probes, the performance of lithium-ion batteries is facing higher development requirements. How to improve lithium-ion batteries The volume energy density and mass energy density have become the key breakthrough directions of high-performance lithium-ion batteries. [0003] At present, high gram-capacity silicon-based anode materials are usually used to increase the energy density of batteries. However, due to the low i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M10/0525
CPCH01M4/139H01M10/0525H01M2004/027Y02E60/10
Inventor 黄苗彭燕秋李琦旸刘金成刘建华
Owner EVE ENERGY CO LTD
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