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A new negative electrode sheet with pre-intercalated lithium and its preparation method

A technology for pre-inserting lithium and negative electrode sheets, which is applied to battery electrodes, structural parts, electrical components, etc., can solve the problem of less pre-insertion lithium, and achieve the effects of more pre-insertion, improved distribution uniformity, and improved effect.

Active Publication Date: 2018-01-30
江西展枭新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method forms a pre-lithiated layer by brush plating or spraying. The method is simple, but there is also the problem of a small amount of pre-intercalated lithium.

Method used

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  • A new negative electrode sheet with pre-intercalated lithium and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The structure of the pre-embedded lithium negative plate of the lithium ion capacitor of the present invention is as follows: figure 1 As shown, the current collector 1 including the porosity (the several through holes provided on the current collector 1 are not in the figure 1 Shown in the table), the current collector 1 is coated with a layer of active material layer 2, and the active material layer 2 is coated with a layer of pre-intercalated lithium layer 3.

[0044] The novel lithium pre-intercalated negative electrode sheet is prepared by the following method:

[0045] (1) Target material preparation: mix uniformly at a ratio of 50% by mass of graphite and 50% by mass of lithium titanate, press to make a 1mm thick target, and place it in the measurement and control sputtering Corresponding location of coating equipment.

[0046] Substrate preparation:

[0047] ①. Mix 80% graphite, 10% vapor-grown carbon fiber, and 10% polytetrafluoroethylene expressed in mass p...

Embodiment 2

[0058] The pre-intercalated lithium negative electrode sheet is prepared by the following method:

[0059] (1) Target material preparation: Mix uniformly with a mass percentage of graphite of 60% and a mass percentage of nickel-cobalt-lithium-manganese oxide of 40%, press to make a 3mm-thick target, and place it in the measurement and control Corresponding location of sputter coating equipment.

[0060] The preparation of the substrate was the same as that in Example 1, and the obtained substrate was cleaned and put into the cavity of the measurement and control sputtering coating equipment.

[0061] (2), the chamber is vacuumed to 5×10 -4 Pa;

[0062] (3), heating the substrate to a constant temperature of 60°C;

[0063] (4) Argon gas is introduced into the cavity, and the pressure is maintained at 2Pa;

[0064] (5) Turn on the cathode power supply of the magnetron sputtering coating equipment to perform sputtering coating.

[0065] The sputtering power of the magnetron ...

Embodiment 3

[0067] The pre-intercalated lithium negative electrode sheet is prepared by the following method:

[0068] (1) Preparation of the target material: 70% by mass of graphite, 30% by mass of a mixture of lithium iron phosphate and lithium manganate (mixed by mass ratio 1:1), and uniformly mixed for pressing. A target material with a thickness of 5 mm was made and placed in the corresponding position of the measurement and control sputtering coating equipment.

[0069] The preparation of the substrate was the same as that in Example 1, and the obtained substrate was cleaned and put into the cavity of the measurement and control sputtering coating equipment.

[0070] (2), the cavity is vacuumed to 10 -3 Pa;

[0071] (3), heating the substrate to a constant temperature of 120°C;

[0072] (4) Argon gas is introduced into the cavity, and the air pressure is maintained at 5Pa;

[0073] (5) Turn on the cathode power supply of the magnetron sputtering coating equipment to perform sput...

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Abstract

The invention discloses a novel lithium-pre-intercalated negative plate and a preparation method thereof. The novel lithium-pre-intercalated negative plate comprises a porous current collector, an active material layer and a lithium pre-intercalation layer, wherein the lithium pre-intercalation layer is attached to the active material layer; the active material layer is prepared from the following components represented by mass percentage: 75%-90% of an active material, 5%-20% of a conductive agent and 5%-10% of a binder; the active material is a lithium-intercalated carbon material; the lithium pre-intercalation layer is a dense and uniform composite thin-film layer of which the thickness is 5-30 microns; the lithium pre-intercalation layer is prepared from the following components represented by mass percentage: 50%-70% of graphite and 30%-50% of a lithium salt; and the lithium pre-intercalation layer is obtained by magnetron sputtering coating on the active material layer. The novel lithium-pre-intercalated negative plate disclosed by the invention is high in lithium-pre-intercalated quantity, high in adhesion to the active material layer and uniform in lithium intercalation, is achieved through magnetron sputtering coating, and is safe and time-saving; and the lithium-pre-intercalated quantity can be controlled.

Description

technical field [0001] The invention relates to a novel lithium-pre-embedded negative plate and a preparation method thereof, belonging to the field of lithium-ion energy storage devices. Background technique [0002] Energy storage devices that can be industrially produced mainly include lithium-ion batteries (LIB) and electric double-layer capacitors (EDLC, supercapacitors), which have been widely used. Lithium-ion batteries have the advantages of high energy density, but have the disadvantages of short service life and low power density. Supercapacitors have the advantages of high output power and long cycle life, but have the problem of low energy density. [0003] Lithium ion capacitor (LIC) adopts a hybrid structure of lithium ion battery and electric double layer capacitor, the positive electrode uses activated carbon, and the negative electrode uses graphite and other materials. It combines the high output and long life characteristics of electric double layer capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/62
CPCH01M4/131H01M4/1391H01M4/625Y02E60/10
Inventor 梁亚青廖运平闵凡奇
Owner 江西展枭新能源科技有限公司
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