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Negative electrode with surface coating as well as preparation method, device and application of negative electrode

A technology of surface coating and negative electrode, which is applied in the field of negative electrode with surface coating, and its preparation field can solve the problems such as the decrease of negative electrode peeling force, and achieve the effect of avoiding the use of solvents, widening the selection range, and preventing material drop

Pending Publication Date: 2022-05-27
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention prepares a surface coating on the surface of the negative electrode sheet through a dry mixing process, which can solve the problem of the decrease in the peeling force of the negative electrode caused by the wet surface coating method, improve the safety performance and electrochemical performance of the electrode sheet, and avoid the use of solvents and The subsequent baking process can effectively reduce raw material costs and energy costs

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  • Negative electrode with surface coating as well as preparation method, device and application of negative electrode
  • Negative electrode with surface coating as well as preparation method, device and application of negative electrode
  • Negative electrode with surface coating as well as preparation method, device and application of negative electrode

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[0045] Embodiments of the present invention provide a method for preparing a negative electrode with a surface coating, the preparation method comprising:

[0046] Dry mixing the surface coating main material and the polymer binder to obtain a mixture, and applying the mixture to at least one surface of the negative electrode sheet to obtain a negative electrode with a surface coating;

[0047] The surface coating main material includes ceramics and / or active substances.

[0048] In some embodiments, the D50 particle size of the surface coating main material is 0.1-10 μm, preferably 0.5-1 μm.

[0049] In some embodiments, the ceramic includes boehmite and / or alumina.

[0050] In some embodiments, the active material includes any one or a combination of at least two of solid electrolyte, lithium titanate and graphite, preferably a solid electrolyte.

[0051] In some embodiments, the solid state electrolyte includes Li 1.3 Al 0.3 TiGe 1.7 (PO 4 ) 3 and / or Li 0.5 La 0.5 ...

Embodiment 1

[0068] This embodiment provides a method for preparing a negative electrode 8 with a surface coating, based on a device for preparing a negative electrode 8 with a surface coating provided based on a specific embodiment, the schematic structural diagram is as follows figure 1 As shown, the preparation method includes:

[0069] The surface coating main material Li with a D50 particle size of 0.8 μm 1.3 Al 0.3 TiGe 1.7 (PO 4 ) 3 And 0.8μm polymer binder PVDF is placed in the dry mixing device 2 for dry mixing to obtain a mixture 1, which is then fed into the pre-stirring device 3 for further extrusion and mixing, while passing through the auxiliary heating device 4. The mixture 1 is heated to melt and soften the binder, and the heating temperature is 100 ° C, and then enters the stirring and discharging device 5, and after extrusion and stirring, a processable surface coating mixture is obtained. The discharge port of the discharging device 5 discharges the material, and th...

Embodiment 2

[0073] This embodiment provides a method for preparing a negative electrode 8 with a surface coating, based on a device for preparing a negative electrode 8 with a surface coating provided based on a specific embodiment, the schematic structural diagram is as follows figure 1 As shown, the preparation method includes:

[0074] The surface coating main material Li with a D50 particle size of 1 μm 0.5 La 0.5 TiO 3 And 10μm polymer binder CMC is placed in the dry mixing device 2 for dry mixing to obtain a mixture 1, which is then fed into the pre-stirring device 3 for further extrusion and mixing. The mixture 1 is heated to melt and soften the binder, and the heating temperature is 120 ° C, and then enters the stirring and discharging device 5, and after extrusion and stirring, a processable surface coating mixture is obtained. The discharge port of the feeding device 5 discharges the material, and the discharge port is flat, and the material is unloaded on the negative electr...

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Abstract

The invention provides a negative electrode with a surface coating as well as a preparation method, device and application thereof, and the preparation method comprises the following steps: carrying out dry mixing on a surface coating main material and a polymer binder to obtain a mixture, and coating the surface of at least one side of a negative plate with the mixture to obtain the negative electrode with the surface coating, the surface coating main material comprises ceramic and / or an active substance. The surface coating is prepared on the surface of the negative plate through a dry mixing process, so that the problem that the stripping force of the negative plate is reduced due to a wet surface coating mode can be solved, the safety performance and the electrochemical performance of the negative plate are improved, meanwhile, the use of a solvent and a subsequent baking process are avoided, and the raw material cost and the energy cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a negative electrode with a surface coating, a preparation method, device and application thereof. Background technique [0002] Lithium-ion batteries have excellent comprehensive performance and have become the main energy source for electric vehicles. With the acceleration of the electrification process of automobiles, people have more stringent requirements on the cruising range and safety of batteries. The introduction of ternary high-nickel systems such as nickel-cobalt-manganese in the positive electrode of the battery can solve the problem of mileage anxiety. At the same time, its safety issues are also urgently needed. solve. Further improving energy density and reducing cost has become an important direction for the development of lithium-ion batteries. At present, in response to the frequent safety problems of lithium-ion batteries, scientific researchers have propose...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 李亚东胡哲卢海燕
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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