Positive electrode material layer, preparation method thereof, positive plate and battery

A technology of positive electrode material layer and positive electrode sheet, which is applied in the field of positive electrode material layer, its preparation, positive electrode sheet and battery, can solve the problem that it is difficult to mix the positive electrode material with the conductive agent and the binder uniformly, the requirement of the roller shaft material is too high, and the difficulty Press into a self-supporting film and other problems to achieve the effect of eliminating the drying process, avoiding post-processing and recycling, and promoting development

Pending Publication Date: 2021-01-29
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the technical conversion process of this technology from supercapacitors to lithium-ion battery pole pieces is still in the early stage of research and development, and there are many problems that need to be solved urgently. For example, in the preparation process of positive pole pieces, because the positive active material itself has a relatively large specific gravity In the mixing process, it is difficult to mix the positive electrode material with the conductive agent and the binder evenly, and this type of material has a relatively high hardness. Cracks cannot be combined with the current collector, and materials with relatively high hardness have too high requirements for the roller shaft material of the roller press, and it is easy to press the roller shaft out of the pit, which greatly increases the equipment cost

Method used

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  • Positive electrode material layer, preparation method thereof, positive plate and battery
  • Positive electrode material layer, preparation method thereof, positive plate and battery
  • Positive electrode material layer, preparation method thereof, positive plate and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Add 9g of carbon-coated nickel-cobalt lithium manganese oxide and 0.2g of conductive agent acetylene black into the blender, stir at a low speed (100rpm) for 10 minutes, mix well, then add 0.8g of polytetrafluoroethylene, and stir at a low speed (100rpm) 10 minutes, mix evenly, high-speed (10000rpm) pulse stirring for 30 minutes, carry out the fiberization process. The mixed powder is put into a roller press, and hot rolled at 150° C. to form a self-supporting film, and repeatedly rolled to a certain compaction density to obtain a self-supporting positive electrode material layer (see figure 1 ), and finally the self-supporting positive electrode material layer is thermally rolled and laminated with the current collector to obtain the positive electrode sheet.

[0056] Among them, carbon-coated nickel-cobalt-manganese oxide lithium includes nickel-cobalt-manganese oxide lithium (NiCoMn) 1 / 3 o 2 , and coated in the Li(NiCoMn) 1 / 3 o 2 The carbon coating layer on the s...

Embodiment 2

[0058] Add 8.5g of carbon-coated nickel-cobalt lithium manganese oxide and 0.5g of conductive agent acetylene black into the blender, stir at a low speed (300rpm) for 10 minutes, mix well, then add 10g of polytetrafluoroethylene, and stir at a low speed (300rpm) 10 minutes, mix evenly, high-speed (16000rpm) pulse stirring for 20 minutes, carry out the fiberization process. The mixed powder is put into a roller press, hot rolled at 150°C to form a self-supporting film, repeatedly rolled to a certain compaction density, and finally hot rolled with a current collector to obtain a positive electrode sheet.

[0059] Among them, carbon-coated nickel-cobalt-manganese oxide lithium includes nickel-cobalt-manganese oxide lithium (NiCoMn) 1 / 3 o 2 , and coated in the Li(NiCoMn) 1 / 3 o 2 The carbon coating layer on the surface, the content of the carbon coating layer in the carbon-coated nickel-cobalt lithium manganese oxide is 3%, and the type of the carbon coating layer is natural gra...

Embodiment 3

[0061] Add 8.0g of carbon-coated nickel-cobalt lithium manganese oxide and 0.2g of conductive agent Super-P into the mixer, stir at low speed (200rpm) for 10 minutes, mix well, then add 0.8g of polytetrafluoroethylene, pulse at low speed (200rpm) Stirring for 10 minutes, mixing evenly, high-speed (17000rpm) pulse stirring for 30 minutes, fiberization process. The mixed powder is put into a roller press, hot rolled at 130°C to form a self-supporting film, repeatedly rolled to a certain compaction density, and finally hot rolled with a current collector to obtain a positive electrode sheet.

[0062] Among them, carbon-coated nickel-cobalt-manganese oxide lithium includes nickel-cobalt-manganese oxide lithium (NiCoMn) 1 / 3 o 2 , and coated in the Li(NiCoMn) 1 / 3 o 2 The carbon coating layer on the surface, the content of the carbon coating layer in the carbon-coated nickel-cobalt lithium manganese oxide is 8%, and the type of the carbon coating layer is artificial graphite.

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Abstract

The invention discloses a positive electrode material layer, a preparation method thereof, a positive plate and a battery. The method comprises the following steps: 1) mixing fibrosis polymer powder,a carbon-coated positive electrode active material and a conductive carbon material, and drawing the fibrosis polymer powder into fibers under the action of shearing force to obtain a mixture; and 2)carrying out hot pressing treatment on the mixture on a current collector to a preset thickness to obtain the positive electrode material layer. According to the method disclosed by the invention, thecarbon-coated positive electrode active substance is applied to the preparation of the dry-method positive electrode material layer, so that the lubrication degree of the positive electrode materialis improved, the mixing uniformity is improved, and the hardness of the positive electrode material is effectively reduced, thereby improving the softness of the electrode plate. The problems of non-uniform mixing of the positive electrode material and cracking of the pole piece caused by high positive electrode material ratio and high hardness when the positive electrode material layer is prepared by a dry method are solved, the requirement on the material of a roller shaft of a roller press in the preparation process of the dry method positive plate can be reduced, and the equipment cost isreduced.

Description

technical field [0001] The invention relates to the technical field of batteries, and relates to a positive electrode material layer, a preparation method thereof, a positive electrode sheet and a battery. Background technique [0002] In recent years, people have devoted themselves to the development of new energy vehicles, but the main problem hindering the popularization of new energy vehicles is the cost issue. At present, from the research of new materials to the development of advanced battery systems, all are moving towards one goal, which is to reduce costs. At present, the wet coating process used in the preparation of positive and negative electrodes in batteries has been continuously optimized, and the process and equipment have reached a very mature stage, but it is undeniable that after wet coating, drying and solvent recovery are required. The cumbersome process such as reprocessing has increased the cost of manpower and material resources, making it difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M4/36H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0525H01M12/08
CPCH01M4/0435H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0525H01M12/08H01M2004/021H01M2004/028Y02E60/10
Inventor 马忠龙秦士林郑晓醒
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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