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Positive electrode material layer for semi-solid-state battery, preparation method of positive electrode material layer, positive electrode sheet and semi-solid-state battery

A positive electrode material layer, positive electrode sheet technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve the problem of difficulty in mixing the positive electrode material with the conductive agent and the binder uniformly, too high requirements on the roller shaft material, Unable to collect current and other problems, achieve good ion conductivity, improve battery performance, and save the effect of drying process

Pending Publication Date: 2020-12-29
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 for semi-solid-state battery, preparation method of positive electrode material layer, positive electrode sheet and semi-solid-state battery
  • Positive electrode material layer for semi-solid-state battery, preparation method of positive electrode material layer, positive electrode sheet and semi-solid-state battery
  • Positive electrode material layer for semi-solid-state battery, preparation method of positive electrode material layer, positive electrode sheet and semi-solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Add 9g of polymer electrolyte-coated nickel-cobalt lithium manganese oxide and 0.2g of 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.

[0061] Among them, the polymer electrolyte coated lithium nickel cobalt manganese oxide includes lithium nickel cobalt manganese oxide Li (NiCoMn) 1 / 3 o 2 , and coated in the Li(NiCoMn) 1 / 3 o 2 The polymer elect...

Embodiment 2

[0063] Add 8.5g of polymer electrolyte-coated nickel-cobalt lithium manganese oxide, 0.5g of conductive agent acetylene black into the mixer, stir at low speed (300rpm) for 10 minutes, mix well, then add 10g of polytetrafluoroethylene, pulse at low speed (300rpm) Stirring for 10 minutes, mixing evenly, high-speed (16000rpm) pulse stirring for 20 minutes, 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.

[0064]Among them, the polymer electrolyte coated lithium nickel cobalt manganese oxide includes lithium nickel cobalt manganese oxide Li (NiCoMn) 1 / 3 o 2 , and coated in the Li(NiCoMn) 1 / 3 o 2 The polymer electrolyte layer on the surface, the content of the polymer electrolyte layer in the polymer electrolyte coated nickel cobalt lithium manganese oxide is 3%, and the co...

Embodiment 3

[0066] Add 8.0g of polymer electrolyte-coated nickel-cobalt-lithium manganese oxide and 0.2g of conductive agent Super-P into the mixer, and pulse-stir at low speed (200rpm) for 10 minutes, mix well, then add 0.8g of polytetrafluoroethylene, low-speed (200rpm ) pulse stirring for 10 minutes, mix evenly, high-speed (17000rpm) pulse stirring for 30 minutes, and carry out the fibrosis 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.

[0067] Among them, the polymer electrolyte coated lithium nickel cobalt manganese oxide includes lithium nickel cobalt manganese oxide Li (NiCoMn) 1 / 3 o 2 , and coated in the Li(NiCoMn) 1 / 3 o 2 The polymer electrolyte layer on the surface, the content of the polymer electrolyte layer in the polymer electrolyte coated nickel cobalt lithium manganese oxide i...

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Abstract

The invention discloses a positive electrode material layer for a semi-solid battery, a preparation method of the positive electrode material layer, a positive electrode sheet and the semi-solid battery. The method comprises the following steps: 1) mixing fibrosis polymer powder, a polymer electrolyte coated positive electrode active substance and a conductive agent, and drawing the fibrosis polymer powder under the action of shearing force to form fibers so as to obtain a mixture; and 2) carrying out hot-pressing treatment on the mixture on a current collector to a preset thickness so as to obtain the positive electrode material layer. According to the method disclosed by the invention, the problems of non-uniform mixing of the positive electrode material and cracking of the electrode sheet 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 the roller shaft of a roller press in the preparation process of the dry-method positive electrode plate is reduced, and the equipment cost is reduced; and the ionic conductivity of the electrode sheet is increased, the use amount of an electrolytic solution is reduced, and the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a positive electrode material layer for a semi-solid battery, a preparation method thereof, a positive electrode sheet and a battery. Background technique [0002] With the popularization of electronic products, lithium batteries have attracted more and more attention because of their advantages such as light weight, small size, high working voltage, high energy density, high output power, high charging efficiency and no memory effect. Inevitably, the requirements for the safety and performance of lithium batteries are also getting higher and higher. Therefore, improving the safety performance of batteries is also one of the main goals of future research on lithium-ion batteries. Currently commercially available lithium-ion batteries are liquid electrolyte batteries. The liquid electrolyte is generally composed of lithium salts, organic solvents and additives, and is in a liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/1391H01M4/13H01M4/131H01M4/62H01M10/052H01M10/0525
CPCH01M4/0435H01M4/13H01M4/131H01M4/139H01M4/1391H01M4/62H01M4/624H01M10/052H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 马忠龙秦士林郑晓醒
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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