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A pre-lithiation method for preparing electrode film based on dry method

A technology for preparing electrodes and electrode films, applied in the field of lithium ion batteries, can solve the problems of complex preparation methods and harsh environmental requirements, and achieve the effects of simple operation steps, low cost and wide application range

Active Publication Date: 2021-07-30
郜明文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pre-lithiation also has problems such as complex preparation methods and harsh environmental requirements. Therefore, it is urgent to provide a method that can overcome the defects of the pre-lithiation method and make lithium-ion batteries have excellent performance in all aspects.

Method used

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  • A pre-lithiation method for preparing electrode film based on dry method
  • A pre-lithiation method for preparing electrode film based on dry method
  • A pre-lithiation method for preparing electrode film based on dry method

Examples

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Effect test

Embodiment 1

[0035] A pre-lithiation method based on a dry method for preparing an electrode film. This example is a simple pre-lithiation process for a graphite active electrode material, which specifically includes the following steps:

[0036] (1) The graphite is made into an electrode film by a dry film-forming method and rolled into a roll with a film thickness of 100 μm.

[0037] (2) Composite the graphite electrode film prepared in step (1) with the lithium strip to obtain a composite film, wherein the thickness of the lithium strip is 500 μm, and its composite structure is as follows figure 1 As shown, the humidity of the composite environment is less than 50RH; the composite film is protected by blowing carbon dioxide protective gas before rolling. The composite film was rolled for the first time through a roller press at a temperature of 80° C., and the thickness of the rolled film was adjusted to 500 μm, and the thickness of the second rolled was adjusted to 300 μm. The time inte...

Embodiment 2

[0040] A pre-lithiation method based on a dry method for preparing an electrode film. In this example, a hard carbon electrode material is first pre-lithiated and then rolled with a lithium foil again so as to adjust the mass ratio of the active material to lithium metal. The method specifically includes the following steps:

[0041] (1) The hard carbon electrode material is made into a thin film by a dry film-forming method and rolled into a roll, and the thickness of the film is 100 μm.

[0042] (2) Composite the hard carbon electrode film prepared in step (1) with the lithium strip to obtain a composite film, wherein the thickness of the lithium strip is 500 μm, and its composite structure is as follows: figure 1 As shown, the humidity of the composite environment is less than 50RH; the composite film is protected by blowing carbon dioxide protective gas before rolling. The composite film was rolled for the first time through a roller press at a temperature of 80° C., and t...

Embodiment 3

[0046] A pre-lithiation method based on a dry method to prepare an electrode film. The example is that the mesophase carbon microsphere (MCMB) is first pre-lithiated and then rolled with the mesophase carbon microsphere (MCMB) dry electrode film to adjust the active material and The mass ratio of metallic lithium specifically comprises the following steps:

[0047] (1) The mesophase carbon microsphere (MCMB) material is made into a thin film by a dry film-forming method and rolled into a roll, and the thickness of the film is 100 μm.

[0048] (2) Composite the MCMB dry electrode film prepared in step (1) with the lithium ribbon to obtain a composite film, wherein the thickness of the lithium ribbon is 500 μm, and its composite structure is as follows: figure 2 As shown, the humidity of the composite environment is less than 50RH; the composite film is protected by blowing carbon dioxide protective gas before rolling. The composite film is rolled for the first time through a ...

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Abstract

The invention discloses a pre-lithiation method for preparing an electrode film based on a dry method, which belongs to the field of lithium ion batteries. The pre-lithiation method includes firstly preparing the electrode material into an independently film-forming film electrode material, and then using the film electrode and lithium metal lamination composite roll pressing for one or several times to finally obtain the pre-lithiation electrode material. The mass ratio of the electrode material to the lithium metal can be adjusted according to the film thickness of the low-temperature dry electrode and the thickness of the lithium metal, or can be adjusted according to the number of times of rolling. Assembling the prepared composite film into a lithium-ion battery and performing performance tests found that the first effect of the prepared pre-lithiated negative electrode lithium-ion battery or lithium-ion hybrid capacitor can be increased by about 10%, and the cycle life can be increased by 30%. This preparation method can According to the needs, different types of electrode films are structurally compounded and simultaneously pre-lithiated to ensure the special needs of energy storage devices such as lithium-ion batteries and lithium-ion capacitors.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more particularly relates to a pre-lithiation method for preparing electrode films based on a dry method, including a method for pre-lithiation of positive and negative electrode active materials of lithium batteries and lithium-ion capacitor energy storage elements . Background technique [0002] In recent years, with the rapid development of electric vehicles and energy storage industries, lithium-ion batteries have become more and more widely used. However, lithium-ion batteries still have problems such as low energy density, high cost, low cycle performance and safety. For example, during the first charging process of a lithium-ion battery, the organic electrolyte will be reduced and decomposed on the surface of the negative electrode such as graphite to form a solid electrolyte phase interface (SEI) film, which will permanently consume a large amount of lithium from the positive elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/1395H01M4/04H01M4/36H01M4/38H01M4/587H01M10/0525H01G11/86H01G11/24H01G11/26H01G11/32H01G11/50
CPCH01G11/24H01G11/26H01G11/32H01G11/50H01G11/86H01M4/0435H01M4/1393H01M4/1395H01M4/366H01M4/382H01M4/587H01M10/0525Y02E60/10Y02E60/13
Inventor 郜明文
Owner 郜明文