Lithium-supplement negative electrode plate and fabrication method thereof

A technology for negative pole pieces and lithium supplementation, which is used in negative electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems that the pole pieces are not easy to store, the accuracy of lithium supplementation is poor, and the equipment requirements are high. The effect of speed guarantee and uniformity guarantee

Inactive Publication Date: 2019-03-08
DONGGUAN TAFEL NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Pre-lithiation is difficult to be used in mass production, because there is no mature equipment for the pre-lithiation process, and the pre-lithiation electrode is not easy to store, and there are certain safety hazards;
[0006] At present, the commonly used method of replenishing lithium is to directly spray or roll lithium powder or lithium tape onto the surface of the negative electrode to form a lithium-replenishing negative electrode sheet, but this method requires high equipment and poor lithium replenishment accuracy. Contact, with certain security risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a preparation method of a lithium-supplementing negative electrode sheet, the preparation method being:

[0049] Mix the lithium powder and the aluminum oxide powder in a ratio of 3:1, so that the aluminum oxide powder is evenly wrapped on the surface of the lithium powder; then add 5% by weight of PVDF, and mix the three evenly; add NMP to the mixed powder, and stir to obtain a slurry with a solid content of 20%; put the negative electrode sheet in an oven, and bake it at 120°C for 2 hours to make the electrode The water content in the sheet is ≤100ppm; the lithium-supplementing slurry is evenly coated on the surface of the baked negative electrode sheet by gravure printing, and the coating thickness is determined according to the actual amount of lithium supplementation; the above-mentioned obtained electrode sheet is baked Dry, and through rolling, die-cutting, slitting and other processes to obtain the pole piece to be wound.

Embodiment 2

[0051] This embodiment provides a preparation method of a lithium-supplementing negative electrode sheet, the preparation method being:

[0052] Mix lithium powder and titanium dioxide powder in a ratio of 2:1, so that titanium dioxide powder is evenly wrapped on the surface of lithium powder; then add PVA to the mixed lithium powder and titanium dioxide powder, and the mass fraction of PVA in the solid material is 1%. and mix the three evenly; add NMP to the mixed powder, and stir to obtain a slurry with a solid content of 30%; place the negative electrode sheet in an oven and bake at 120°C for 2 hours to make the electrode sheet The water content of the lithium supplement is ≤100ppm; the lithium-supplementing slurry is evenly coated on the surface of the baked negative electrode sheet by extrusion coating, and the coating thickness is determined according to the actual amount of lithium supplementation; Dry, and through rolling, die-cutting, slitting and other processes to o...

Embodiment 3

[0054] This embodiment provides a preparation method of a lithium-supplementing negative electrode sheet, the preparation method being:

[0055] Mix the lithium powder and zirconia powder in a ratio of 5:1, so that the zirconia powder is evenly wrapped on the surface of the lithium powder; then add PTFE to the mixed lithium powder and zirconia powder, and the PTFE in the solid material The mass fraction is 10%, and the three are mixed evenly; NMP is added to the mixed powder, and stirred to obtain a slurry with a solid content of 10%; the negative electrode sheet is placed in an oven and baked at 120 ° C for 2 Hours, make the water content in the pole piece ≤ 100ppm; use the method of spraying to evenly coat the lithium-supplementing slurry on the surface of the baked negative pole piece, and the coating thickness is determined according to the actual amount of lithium supplementation; the above-mentioned The pole piece is dried, and the pole piece to be wound is obtained thro...

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Abstract

The invention provides a lithium-supplement negative electrode plate and a fabrication method thereof. The lithium-supplement negative electrode plate comprises a pole plate and a lithium-supplement coating layer, wherein the lithium-supplement coating layer is coated at an outer side of the pole plate and comprises metal lithium powder and ceramic powder and/or inorganic salt powder. The preparation method comprises the steps of mixing the metal lithium powder and the ceramic powder and/or the inorganic salt powder to obtain mixed powder under a protection atmosphere, mixing the mixed powder,a binding agent and an organic solvent to obtain paste, and coating the paste onto a surface of a negative electrode plate to obtain the lithium-supplement negative electrode plate. The lithium supplement method is high-efficiency and low in equipment requirement and is simple to operate, and lithium supplement quantity can be accurately controlled.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a lithium-ion battery negative pole piece, in particular to a lithium-supplementing negative pole piece. Background technique [0002] With the popularization of electric vehicles and the increase in the demand for the mileage of electric vehicles, high-energy-density power lithium-ion batteries have attracted widespread attention. [0003] During the first charging process of a lithium-ion battery, since a solid electrolyte film (SEI film) will be formed on the surface of the negative electrode sheet, a part of the lithium ions migrated from the positive electrode will be consumed, especially when the negative electrode is made of Si-C negative electrode material containing Si. More lithium ions are consumed. This causes a large loss of lithium ions in the battery, thereby affecting the capacity of the lithium-ion battery, and also has a significant impact on the service life...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/0404H01M4/134H01M4/1395H01M4/366H01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 王汭於洪将邹武元姜斌
Owner DONGGUAN TAFEL NEW ENERGY TECH CO LTD
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