Lithium ion battery electrode sheet, preparation method thereof, and lithium ion battery

A lithium-ion battery and electrode sheet technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode manufacturing, etc., can solve the problems of easy water absorption of electrode sheets, achieve the effects of ensuring inherent performance, reducing storage and transportation costs, and saving costs

Inactive Publication Date: 2019-01-08
JIAN UTILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a lithium-ion battery electrode sheet and its preparation method and lithium-ion battery, aiming to solve the technical problem that the existing lithium-ion battery electrode sheet is easy to absorb water

Method used

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  • Lithium ion battery electrode sheet, preparation method thereof, and lithium ion battery
  • Lithium ion battery electrode sheet, preparation method thereof, and lithium ion battery
  • Lithium ion battery electrode sheet, preparation method thereof, and lithium ion battery

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preparation example Construction

[0021] On the other hand, an embodiment of the present invention provides a method for preparing the above lithium-ion battery electrode sheet, comprising the following steps:

[0022] S01: dissolving the active material, hydrophobic agent, conductive agent and binder in a solvent to obtain an electrode slurry;

[0023] S02: Coating the electrode slurry on the current collector and performing drying treatment.

[0024] In the preparation method of lithium-ion battery electrode sheets provided by the embodiments of the present invention, a hydrophobic agent is added to the slurry during the batching process, so that in the prepared electrode slurry, the active electrode material, conductive agent and binder can all be Fully exposed to the hydrophobic agent, the hydrophobic agent is fully infiltrated in the electrode slurry, and then the solvent is sublimated by the high temperature of the coating process, so that the entire electrode sheet is hydrophobic. The pole pieces are a...

Embodiment 1

[0044] A method for preparing a positive electrode sheet, comprising the steps of:

[0045] First prepare the slurry by the following parts by weight:

[0046]

[0047] The viscosity is adjusted to 3000Pas-6000Pas, and the mixed slurry is evenly coated on the aluminum foil, with a single layer thickness of 40 μm and double layer coating. After drying, it is rolled to form the desired electrode sheet.

[0048] Among them, the surface density of coated electrodes is 20*10 -5 g / mm 2 ; The electrode sheet area placed in the temperature and humidity control room is 0.05m 2 (shape specification is the same as comparative example 1).

Embodiment 2

[0057] A method for preparing a negative electrode sheet, comprising the steps of:

[0058] First prepare the slurry by the following parts by weight:

[0059]

[0060] The viscosity is adjusted to 3000Pas-6000Pas, and the mixed slurry is evenly coated on the aluminum foil, with a single layer thickness of 40 μm and double layer coating. After drying, it is rolled to form the desired electrode sheet.

[0061] Among them, the surface density of coated electrodes is 10*10 -5 g / mm 2 ; The electrode sheet area placed in the temperature and humidity control room is 0.05m 2 (The shape specification is the same as Comparative Example 2).

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Abstract

The invention belongs to the technical field of batteries, in particular to a lithium ion battery electrode sheet, a preparation method thereof and a lithium ion battery. A lithium ion battery electrode sheet comprises a current collector and an active material layer coated on the current collector surface, the active material layer comprises an active material, a hydrophobic agent, a conductive agent and a binder, wherein the active material, the surfaces of the conductive agent and the binder are bonded with the hydrophobic agent, and the active material is a positive electrode active material or a negative electrode active material. Such a lithium ion battery electrode sheet can be prevented from absorbing too much water in the course of transporting and operating under the environmentwith high humidity, thereby ensuring the inherent performance of the electrode sheet and reducing the storage and transporting cost of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion battery electrode sheet, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phone and notebook batteries, power batteries and energy storage batteries due to their excellent properties such as high voltage, high energy density and long cycle life. Among them, mobile phone and notebook batteries have been completely occupied by lithium-ion batteries, and other types of batteries cannot meet the stringent requirements of these portable smart devices. With the development of lithium-ion battery technology, its proportion in power battery energy storage batteries is also increasing. From the current development trend, lithium-ion batteries are in a stage of rapid development and have broad application prospects. [0003] The existing lithium-ion battery electrode sheets ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/62H01M4/13H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/62H01M10/0525Y02E60/10
Inventor 钟国兵丁晨孟亚斌王继生
Owner JIAN UTILITY TECH CO LTD
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