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Electrode plate, preparation method thereof and lithium battery

A technology of electrode sheet and electrode film, which is applied in the direction of lithium storage battery, non-aqueous electrolyte storage battery, battery electrode, etc., can solve the problems that are difficult to meet the needs of batteries, low density of fluorinated carbon materials, and large specific surface area, so as to improve energy density and strengthen The effect of overall bonding performance and simple operation

Inactive Publication Date: 2021-01-08
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above-mentioned CN102903921A and CN104466107A both adopt the coating method to prepare electrodes, and their thickness is less than 300 μm. Due to the characteristics of low density and large specific surface area of ​​fluorinated carbon materials, carbon fluoride pole pieces manufactured by coating method are generally thin electrodes. Difficult to meet the needs of batteries in the direction of high energy density

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  • Electrode plate, preparation method thereof and lithium battery

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Embodiment 1

[0054] In this embodiment, the positive electrode sheet is prepared according to the following method:

[0055] (1) The positive electrode active material fluorinated graphite, the conductive agent carbon black and the binder polyvinylidene fluoride (PVDF) are weighed according to the mass ratio of 90:5:5. After the binder PVDF is completely dissolved in the solvent NMP, the conductive Stir and disperse the agent to form a conductive adhesive, then add the fluorinated graphite active material, stir and disperse evenly to obtain the first layer of slurry to be coated with high viscosity (solid content is 35%, viscosity is 7500mPa·s). The first layer of slurry was evenly coated on one side of the carbon-coated aluminum foil, and dried in a segmented oven at a low temperature of 90°C and a high temperature of 110°C to obtain the first positive electrode membrane, the thickness of which was 120 μm.

[0056] (2) The positive electrode active material fluorinated graphite, the condu...

Embodiment 2

[0059] In this embodiment, the positive electrode sheet is prepared according to the following method:

[0060] (1) Preparation of the first positive electrode diaphragm: the positive electrode active material fluorinated carbon fiber, the conductive agent carbon black and the binder polyvinylidene fluoride (PVDF) are weighed according to the mass ratio of 89:5:6, and the binder PVDF is completely After being dissolved in the solvent NMP, add conductive agent to stir and disperse to form conductive glue, then add fluorinated graphite active material, stir and disperse evenly to obtain the first layer of slurry to be coated with high viscosity (solid content is 35%, viscosity is 8100mPa· s). The first layer of slurry was evenly coated on one side of the carbon-coated aluminum foil, and dried in a segmented oven at a low temperature of 90°C and a high temperature of 110°C to obtain the first positive electrode membrane, the thickness of which was 150 μm.

[0061] (2) Preparatio...

Embodiment 3

[0064] In this embodiment, the positive electrode sheet is prepared according to the following method:

[0065] (1) The positive electrode active material fluorinated graphene, the conductive agent Ketjen black and the binder polyvinylidene fluoride (PVDF) are weighed according to the mass ratio of 90:4:6, and the binder PVDF is completely dissolved in the solvent NMP, Add a conductive agent to stir and disperse to form a conductive glue, then add fluorinated graphite active material, stir and disperse evenly to obtain a high-viscosity first layer of slurry to be coated (solid content 35%, viscosity 8121mPa·s). The first layer of slurry was evenly coated on one side of the carbon-coated aluminum foil, and dried in a sectional oven at a low temperature of 60°C and a high temperature of 100°C to obtain the first positive electrode membrane, the thickness of which was 60 μm.

[0066] (2) The positive electrode active material fluorinated graphene, the conductive agent Ketjen blac...

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Abstract

The invention provides an electrode plate, a preparation method thereof and a lithium battery. The electrode plate comprises an electrode current collector and an electrode active substance film layerpositioned on the electrode current collector, and the electrode active substance film layer comprises at least two layers of stacked electrode diaphragms; and on the same surface of the electrode current collector, the mass fraction of a binder in each electrode diaphragm which is not attached to the electrode current collector is not lower than the mass fraction of a binder in the electrode diaphragm which is closer to the electrode current collector than the electrode diaphragm. The method comprises the following steps: 1) coating a current collector with electrode slurry, and drying to obtain a layer of electrode diaphragm; and 2) repeating the operation of coating the electrode slurry on the electrode membrane obtained by the previous operation and drying for at least once to obtainthe electrode plate. The electrode plate provided by the invention can improve the overall bonding performance of the electrode, increase the loading capacity of active substances on the current collector per unit area and improve the energy density of the electrode plate.

Description

technical field [0001] The invention belongs to the field of batteries, and relates to an electrode sheet, a preparation method thereof, and a lithium battery, in particular to a positive electrode sheet, a preparation method thereof, and a lithium battery. Background technique [0002] Lithium / carbon fluoride battery is the lithium primary battery with the highest specific energy in the solid positive electrode series. Its theoretical mass specific energy is as high as 2180Wh / kg, and it has a wide operating temperature range, high safety performance, high and stable working platform, and self-discharge rate. Low-level advantages have received widespread attention. With the continuous advancement of science and technology, computers, mobile phones, smart meters, communication equipment and equipment in special fields have higher and higher requirements for power supply energy density, especially for unmanned aerial vehicles, underwater vehicles, etc. Special field equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/052
CPCH01M4/13H01M4/139H01M4/622H01M10/052Y02E60/10
Inventor 林锦芳李琦旸门方徐晓霞袁中直刘建华刘金成
Owner EVE ENERGY CO LTD