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Secondary battery electrode and preparation method thereof, secondary battery and preparation method thereof

A secondary battery and electrode technology, which is applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of battery electrical performance degradation, slow growth of electrode active material layers, etc., and achieve high density, less grain boundaries, and low cost effect

Active Publication Date: 2021-07-30
THE NORTHERN RES INST OF NJUST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The first object of the present invention is to provide a kind of preparation method of secondary battery electrode, the second object of the present invention is to provide a kind of secondary battery electrode that utilizes this preparation method to obtain, to alleviate the magnetron sputtering method of prior art The slow growth of the electrode active material layer and the technical problems of the existing 3D printing technology using binders cause the battery's electrical performance to decline

Method used

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  • Secondary battery electrode and preparation method thereof, secondary battery and preparation method thereof

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preparation example Construction

[0037] The preparation method of the secondary battery electrode provided by the present invention is to use a laser to heat the electrode active material, and the powder particles in the electrode active material can be melted by using the instantaneous high-temperature heating of the laser, and the powder particles in the electrode active material are to be After solidification, the powder particles can be bonded together to obtain an electrode without binder addition.

[0038] The preparation method provided by the invention can realize the preparation of an electrode active material layer with a thickness of 20-100 microns within 4-10 minutes, and is a new method and process suitable for industrial production that is simple, efficient, low-cost and suitable.

[0039] It should be noted that in the preparation method of the present invention, the electrode active material dry powder layer contains the electrode active material and inorganic materials similar to conductive ag...

Embodiment 1

[0070] This embodiment is a method for preparing a positive electrode of a secondary battery, which specifically includes the following steps:

[0071] Step a) Preparation of slurry: using water as a volatile solvent, micron or nanoscale LiCoO 2 It is the positive electrode active powder, which is dissolved in a solvent, and is thoroughly stirred and ground to make a slurry of the positive electrode active material;

[0072] Step b) coating and drying to prepare a positive active material dry powder layer: coating the slurry obtained in step a) on the current collector by scraping, and controlling the scraping thickness to about 10 microns;

[0073] The current collector is aluminum foil, and after scraping the slurry, the current collector coated with the slurry is dried in an oven at 100-200°C to form a dispersed dry powder layer of positive active material;

[0074] Step c) laser heating to prepare the positive electrode active material layer: place the dry powder layer of...

Embodiment 2

[0077] This embodiment is a method for preparing a positive electrode of a secondary battery. Compared with the embodiment, the difference lies in that the power of the laser is different. In this embodiment, the power of the laser is 6W. Others are the same as in Embodiment 1.

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Abstract

The invention provides a secondary battery electrode and a preparation method thereof, a secondary battery and a preparation method thereof, and relates to the technical field of secondary batteries. The preparation method of the secondary battery electrode uses a laser to heat a dry powder layer of an electrode active material, The electrode is obtained after the dry powder layer of the electrode active material is melted and solidified. Using this method can alleviate the technical problems of the slow growth of the electrode active material layer prepared by the magnetron sputtering method in the prior art and the decline in the electrical performance of the battery caused by the use of binders in the existing 3D printing technology, and achieve the goal of improving the generation efficiency and electrical performance of the battery. Purpose.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a secondary battery electrode and a preparation method thereof, and a secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high discharge voltage, high energy density, high power density, long cycle life and no memory effect. They are used in consumer electronics, power tools, medical electronics, electric vehicles, rail transit, aerospace, large-scale renewable It has a wide range of applications in areas such as energy access, power grid peak regulation and frequency regulation, and distributed energy storage. However, currently commercial lithium batteries use organic liquid electrolytes, which are flammable and explosive, which greatly hinders the popularization and application of lithium batteries. [0003] With the development of solid-state electrolyte materials, the research and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/04H01M10/0562H01M10/0525H01M10/058
CPCH01M4/0404H01M4/0471H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/0525H01M10/0562H01M10/058Y02E60/10Y02P70/50
Inventor 夏晖徐璟孙硕昝峰夏求应岳继礼
Owner THE NORTHERN RES INST OF NJUST