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Anode current collector and preparation method thereof, negative electrode sheet, and lithium ion battery

A lithium-ion battery and negative pole piece technology, which is applied in the field of electrochemical batteries, can solve the problems of difficult control of the doping amount and uneven distribution of lithium, and achieve the effects of light weight, improved distribution uniformity, and improved battery performance

Pending Publication Date: 2019-01-18
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to provide a negative electrode current collector, a preparation method thereof, a negative electrode sheet, and a lithium-ion battery for the problems of uneven distribution of lithium in the negative electrode and difficult control of the doping amount.

Method used

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  • Anode current collector and preparation method thereof, negative electrode sheet, and lithium ion battery
  • Anode current collector and preparation method thereof, negative electrode sheet, and lithium ion battery
  • Anode current collector and preparation method thereof, negative electrode sheet, and lithium ion battery

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preparation example Construction

[0050] The embodiment of the present invention also provides a method for preparing the negative electrode current collector 100, comprising the following steps:

[0051] S110, providing the porous metal substrate 110;

[0052] S120, providing a lithium source, the lithium source is used to provide the lithium-containing material 120;

[0053] S130, load the lithium source in the pores 111 of the porous metal substrate 110 .

[0054] In step S110, the porous metal substrate 110 can be obtained by self-preparation or commercial purchase.

[0055] In one embodiment, the porous metal substrate 110 is prepared by utilizing the difference in solubility of different metals in acid. The step of preparing the porous metal substrate 110 may include:

[0056] uniformly mixing a first metal soluble in a specific acid solution and a second metal soluble in the specific acid solution to obtain an alloy; and

[0057] The alloy is treated with the specific acid solution to dissolve the f...

Embodiment 1

[0077] Negative pole piece preparation:

[0078] According to the ratio of the areal density of the negative active material layer 200 to the areal density of the positive active material is 1.0˜1.2, the mass of the positive active material is calculated. According to the mass of the lithium-containing material 120 accounting for 0.1%-1% of the positive electrode active material, the content of the lithium-containing material 120 to be loaded in the negative electrode current collector 100 is calculated.

[0079] The carbon-coated lithium-containing material 120 and NMP were mixed, and ultrasonicated at 25° C. for 5 hours to obtain a dispersion with a molar concentration of 3 mol / L. Soak the porous copper substrate in the dispersion liquid for 5 hours, remove the porous copper substrate loaded with the lithium-containing material 120 from the dispersion liquid, and vacuum dry at 80° C. for 5 hours to obtain the negative current collector 100 .

[0080] The graphite of 92%-98%...

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Abstract

The invention discloses a negative electrode current collector comprising a porous metal substrate and a lithium-containing material incorporated in the porous metal substrate, the lithium-containingmaterial being uniformly loaded in pores of the porous metal substrate, and the lithium-containing material being capable of being removed from the pores during a lithium ion battery cycle. The invention also discloses a negative electrode sheet, comprising the negative electrode current collector and a negative electrode active material layer of the negative electrode current collector surface, wherein the negative electrode material layer comprises a negative electrode active material. The invention also discloses a preparation method of the negative electrode current collector and a lithiumion battery.

Description

technical field [0001] The invention relates to the field of electrochemical batteries, in particular to a negative electrode current collector, a preparation method thereof, a negative electrode sheet, and a lithium ion battery. Background technique [0002] Due to the advantages of high energy density, long cycle life, and no memory effect, lithium-ion batteries have been widely used in consumer electronics products since their commercialization. At present, lithium-ion batteries are also growing steadily in the new energy vehicle market, grid energy storage and household energy storage markets. At the same time, under the influence of national policies, lithium-ion batteries have higher requirements for high energy density. [0003] For how to improve the energy density of lithium-ion batteries, the current main development direction and ideas are focused on the research of positive and negative electrode materials with high specific capacity, such as high-nickel ternary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M10/0525Y02E60/10
Inventor 李乾乾何意钟宽魏文飞吉纯
Owner GREE ELECTRIC APPLIANCES INC
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