Method for preparing lithium ion membrane electrode through static coating, electrode and cell comprising electrode

A thin-film electrode, electrostatic coating technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as failure to achieve success, affecting slurry fluidity, and inability to meet needs, achieving good uniformity and broad application prospects , the effect of low cost

Active Publication Date: 2016-01-06
NEWNAGY TANGSHAN
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In the actual preparation process, the thickness of the thin film electrode prepared by the above method is difficult to reach the submicron level, which still cannot meet the needs
[0004] At present, the ordinary lithium battery electrode coating process can only prepare active materials with a thickness of more than 15 μm, and thin film electrodes below 15 μm or even nanometer scale cannot be prepared, which cannot meet the needs of thin film batteries.
The high cost of the current solid-state thin-film preparation technology based on magnetron sputtering also limits its large-scale use in the field of thin-film batteries.
[0005] Electrostatic spraying and electrospinning technologies have been widely used in many fields. The coating prepared by electrostatic spraying has uniform thickness and good bonding force with the substrate. However, the electrostatic coating technology that combines electrostatic spraying and electrospinning technology is not It has not been applied in lithium-ion thin-film electrodes, mainly because many technical difficulties need to be overcome to prepare sub-micron to micron-scale thin-film electrodes. There are strict requirements, the solid content and the slurry ratio will affect the fluidity of the slurry, the thickness of the film and the uniformity of the active material
Years of experimentation by practitioners without success

Method used

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  • Method for preparing lithium ion membrane electrode through static coating, electrode and cell comprising electrode
  • Method for preparing lithium ion membrane electrode through static coating, electrode and cell comprising electrode
  • Method for preparing lithium ion membrane electrode through static coating, electrode and cell comprising electrode

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preparation example Construction

[0036] The invention provides a method for preparing a thin film electrode, which is characterized in that it comprises the following steps:

[0037] (1) preparing positive electrode slurry and negative electrode slurry, wherein the solid content of the prepared positive electrode slurry is 20% to 35%, and the solid content of the prepared negative electrode slurry is 20% to 40%;

[0038] Generally, before electrostatic coating, the appropriate active material and other auxiliary materials are selected according to the requirements of the battery and thin film electrode to be prepared. In order to prepare a better thin film electrode, the particle size of the active material is generally required to be below 5 microns.

[0039] For the prepared electrostatic coating slurry, the electrostatic coating slurry is generally prepared according to the specific requirements of the thin film electrode, including adjusting the slurry viscosity, solid content, the proportion of active mat...

Embodiment 1

[0076] (1) According to the mass content of positive electrode active material lithium iron phosphate 16%, carbon black 5%, PVDF4%, with aluminum foil as positive electrode current collector as the carrier of active material, the ratio of NMP75% prepares positive electrode slurry 500g, wherein the lithium iron phosphate D. 50 It is 0.15 microns, and its solid content is 20%; according to the mass content of the negative electrode active material lithium titanate 18%, carbon black 3%, PVDF 4%, copper foil is used as the negative electrode current collector as the carrier of the active material, and the ratio of NMP75% is prepared Negative electrode slurry 500g, wherein D of lithium titanate 50 It is 0.15 microns, and its solid content is determined to be 20%.

[0077] (2) Add the above-mentioned prepared slurry to the electrospinning equipment for spraying, set the nozzle diameter to 1000 microns, the distance between the nozzle and the substrate to 10cm, the speed of the nozz...

Embodiment 2

[0080] (1) According to the mass content of positive electrode active material lithium iron phosphate 28%, carbon black 3%, PVDF4%, with aluminum foil as positive electrode current collector as the carrier of active material, the ratio of NMP65% prepares positive electrode slurry 500g, wherein the lithium iron phosphate D. 50 It is 4 microns, and its solid content is 35%; according to the mass content of the negative electrode active material lithium titanate 30%, carbon black 3%, PVDF 2%, copper foil is used as the negative electrode current collector as the carrier of the active material, and the ratio of NMP65% is prepared Negative electrode slurry 500g, wherein D of lithium titanate 50 It is 4 microns, and its solid content is determined to be 40%.

[0081] (2) Add the above-mentioned prepared slurry to the electrospinning equipment for spraying, set the nozzle diameter to 500 microns, the distance between the nozzle and the substrate to 15cm, the speed of the nozzle to 1...

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Abstract

The invention relates to a preparation method for a lithium ion membrane electrode. The preparation method comprises the following steps: firstly, a positive electrode slurry and a negative electrode slurry are prepared, the solid content of the prepared positive electrode slurry is 20%-35% and the solid content of the prepared negative electrode slurry is 20%-40%; secondly, the prepared positive electrode slurry and the prepared negative electrode slurry in the first step are subjected to static coating, and an electrode membrane is obtained; thirdly, the electrode membrane obtained in the second step is dried and finally a membrane electrode is obtained. The invention also provides a membrane electrode prepared through the provided method and a cell comprising the electrode. The prepared membrane electrode has good performances, the thickness of the membrane electrode is from a submicron order to 15 micrometers, requirements of preparation of a membrane cell with a capacity of 4 microAh/cm<2>-100 microAh/cm<2> can be met, and the membrane electrode has wide applications.

Description

technical field [0001] The invention relates to a lithium ion thin film electrode and a preparation method thereof, in particular, the invention relates to a lithium ion thin film electrode prepared by screen printing, a preparation method thereof, and a battery containing the thin film electrode. Background technique [0002] With the widespread popularity of various applications of thin film electrodes, such as flat panel displays, anti-static and anti-electromagnetic shielding layers, surface heating elements, thermal emission films, batteries, thin film resistors, sensors, terminal equipment, automotive glass and printers , especially for applications in optical recording, magnetic recording, electronic paper and thin film capacitors, the thickness of thin film electrodes prepared by existing methods can no longer meet the needs of practical applications. [0003] The preparation methods of thin film electrodes generally include radio frequency magnetic sputtering method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/131H01M4/136H01M10/0525
CPCY02E60/10
Inventor 常林荣董新义郝立星马赫然郎佳星
Owner NEWNAGY TANGSHAN
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