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Negative active film layer and preparation method thereof, pre-lithiation method, negative pole piece and lithium battery

A technology of active negative electrode and negative electrode plate, applied in the field of negative electrode plate and lithium battery, can solve the problems of difficult operation, low safety factor, low theoretical capacity, etc.

Inactive Publication Date: 2021-06-25
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial use of graphite anode materials for lithium-ion batteries has a low theoretical capacity, and there is little room for further improvement of its capacity, which is far from meeting the needs of future high-capacity and long-life electronic devices.
Metal and alloy materials are the new high-efficiency lithium storage anode material systems that have been studied more in recent years. Among them, silicon-oxygen materials have attracted much attention because of their extremely high theoretical specific capacity, but they will form some irreversible capacity when they are charged for the first time. By-products, resulting in the initial efficiency of the battery far below the application standard
[0004] In order to overcome these defects, electrochemical pre-lithium and chemical pre-lithium are usually used to improve the initial efficiency of silicon oxygen carbon lithium-ion batteries, but the above-mentioned operations are difficult and have a low safety factor.

Method used

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  • Negative active film layer and preparation method thereof, pre-lithiation method, negative pole piece and lithium battery
  • Negative active film layer and preparation method thereof, pre-lithiation method, negative pole piece and lithium battery
  • Negative active film layer and preparation method thereof, pre-lithiation method, negative pole piece and lithium battery

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preparation example Construction

[0030] Specifically, the application provides a method for preparing a negative electrode active film layer, which includes the following steps:

[0031] S1. Obtain molten lithium liquid.

[0032] Since impurities have a great influence on the properties of the final product obtained, specifically, the molten lithium solution is obtained by: polishing the surface of the lithium foil to remove surface impurities, placing it in a melting device protected by an inert atmosphere, and heating until molten.

[0033] Optionally, the lithium foil has a purity >99.99%.

[0034] Through the above-mentioned setting method, the interference of impurities contained in the lithium foil itself is avoided. At the same time, due to the active nature of lithium, the above-mentioned method of melting under an inert atmosphere can effectively avoid lithium from reacting with moisture and oxygen in the air during the melting process. Introduce impurities and affect the final product performance....

Embodiment 1

[0081] S1. The surface of the lithium foil is polished, placed in a melting device protected by argon (purity ≥ 99.99%), and heated to 250°C to obtain molten lithium.

[0082] S2. Slowly add fluorinated graphite powder into the liquid molten lithium at a speed of 150rpm, stir slowly to make it fully mixed, then pour it out, and use a four-sided scraper to scrape it on the upper surface of the 8μm thick copper foil, Squeegee coating with a thickness of 1.5 μm, and then place it in O 2 2 In the environment of O<0.1ppm, let it stand for 5 hours to make it form a negative electrode active film layer on the surface of the copper foil, as a pre-lithiated stable lithium-coated copper foil.

[0083] Among them, the scanning electron microscope image of the negative electrode active film layer is as follows figure 2 As shown, it can be seen that the negative electrode active film layer is a sandwich structure of CF layer-LiF layer-Li layer.

[0084] The Li layer in the negative elec...

Embodiment 2

[0086] S1. The surface of the lithium foil is polished, placed in a melting device protected by argon (purity ≥ 99.99%), and heated to 250°C to obtain molten lithium.

[0087] S2. Slowly add fluorinated graphite powder into the liquid molten lithium at a speed of 150rpm, stir slowly to make it fully mixed, then pour it out, and use a four-sided scraper to scrape it on the upper surface of the 8μm thick copper foil, Squeegee coating with a thickness of 0.5 μm, and then place it in O 2 2 In the environment of O<0.1ppm, let it stand for 5h to form a uniform negative electrode active film layer of CF layer-LiF layer-Li layer on the surface of the copper foil, as a pre-lithiated stable lithium-coated copper foil.

[0088] Wherein, the Li layer in the negative electrode active film layer is connected to the copper foil surface, the mass ratio of graphite fluoride powder to liquid molten lithium is 1:10, and the particle size and fluorocarbon ratio of graphite fluoride powder are sho...

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Abstract

The invention discloses a negative active film layer and a preparation method thereof, a pre-lithiation method, a negative pole piece and a lithium battery, and belongs to the field of batteries. The preparation method of the negative active film layer comprises the steps of mixing carbon fluoride with a molten lithium liquid in a protective atmosphere, then coating a planar carrier with the mixture to form a coating, and standing for not less than 2 hours so as to form a carbon fluoride layer-lithium fluoride layer-lithium layer sandwich structure in the coating, wherein the mass ratio of the carbon fluoride to the molten lithium liquid is 10: (0.5-1), the chemical formula of the carbon fluoride is CFx, X is greater than or equal to 0.5 and less than or equal to 0.99, and the protective atmosphere is used for inhibiting the oxidation of the molten lithium liquid. The preparation method is simple and controllable, the negative active film layer formed by sequentially connecting the CF layer, the LiF layer and the Li layer is formed, the pre-lithiation method containing the negative active film layer, the negative pole piece and the lithium battery all have excellent first efficiency, and the negative pole piece can be kept stable in ambient air for a long time and has excellent first efficiency.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to a negative electrode active film layer and a preparation method thereof, a pre-lithiation method, a negative electrode sheet and a lithium battery. Background technique [0002] At present, as a mature energy storage unit, lithium-ion batteries have been gradually integrated into every part of life. Lithium-ion batteries are used as energy storage units in mobile phones, notebooks and other electrical appliances in daily life. In recent years, lithium-ion batteries have also been gradually used in power storage, such as electric vehicles. [0003] For lithium-ion batteries, the factors that most affect its energy density should be the positive electrode material and the negative electrode material. The current commercial use of graphite anode materials for lithium-ion batteries has a low theoretical capacity, and there is little room for further improvement of its capacity, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/36H01M4/38H01M4/58H01M10/052H01M10/42
CPCH01M4/0404H01M4/366H01M4/582H01M4/382H01M4/13H01M10/052H01M10/4235Y02E60/10
Inventor 赵育松邱昭政李文龙梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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