A kind of drying method for preparing electrode based on blade coating method and its electrode and application

A technology for preparing electrodes and a drying method, which is applied to the drying of electrodes prepared based on the blade coating method, as well as the electrodes and application fields, can solve the problems of small particles, easy falling off of active substances, insufficient adhesion, etc. Liquid absorption rate and specific surface area, the effect of improving the rate performance

Active Publication Date: 2022-02-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional drying method, that is, the electrode dried by the oven drying method usually cracks when the binder content is low and the active material load is high, and the active material is easy to fall off.
The reason is that 1. The particles of a large number of high-performance materials are small (usually nano-scale or micron-scale), and the adhesiveness is not enough when the adhesive is bonded.

Method used

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  • A kind of drying method for preparing electrode based on blade coating method and its electrode and application
  • A kind of drying method for preparing electrode based on blade coating method and its electrode and application
  • A kind of drying method for preparing electrode based on blade coating method and its electrode and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve 0.03g carboxymethylcellulose (CMC) in 4g deionized water, stir for 1h, add 0.8gS / A-KB600 and 0.1g graphene, stir for 5h, then add 0.15g 40wt% styrene-butadiene rubber (SBR), Stir at a slow speed for 0.5h, adjust the scraper to 500μm to scrape and coat on the aluminum film, quickly immerse in liquid nitrogen, take it out after 10min, and quickly transfer to a freeze dryer (temperature -50°C, vacuum <10) to dry 10h, dry overnight at 50°C. Subsequent electrode preparation and battery assembly are the same as in Comparative Example 1.

[0033] The first discharge specific capacity at 0.1C rate is 1203mA h g -1 , when the rate is increased to 2C, the discharge specific capacity is 675mA h g -1 .

Embodiment 2

[0038] Dissolve 0.03g of carboxymethyl cellulose (CMC) in 4g of deionized water, stir for 1 hour, add 0.8g of LFP and 0.1g of Super P, and then prepare the electrode and assemble the battery as in Example 1.

[0039] The first discharge specific capacity is 160.9mA h g at 0.2C rate -1 , when the rate is increased to 10C, the discharge specific capacity is 40.6mA h g -1 .

Embodiment 3

[0044]Dissolve 0.03 g of carboxymethylcellulose (CMC) in 4 g of deionized water, stir for 1 h, add 0.8 g of NTP and 0.1 g of Super P, and then prepare the electrode and assemble the battery as in Example 1.

[0045] The specific capacity of the first cycle discharge at 0.1C rate is 86.2mAh g -1 , when the rate is increased to 10C, the specific discharge capacity is 8mAh g -1 .

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Abstract

The invention relates to a drying method for preparing an electrode based on a scraping coating method, the electrode and its application. In the process of preparing an electrode by the scraping coating method, the electrode slurry scraped on the substrate is pretreated by a freeze-drying method, and then dried get electrodes. The freeze-drying method is simple, the process is environmentally friendly, the prepared electrode has a stable structure and high cohesiveness, and can effectively improve the cracking of the oven-dried electrode, the falling off of active materials and the like. The prepared electrode is usually a porous electrode, and this porous electrode structure effectively improves the specific surface area of ​​the electrode reaction. This electrode drying method can be applied in the field of lithium-sulfur battery, lithium-ion battery, sodium-ion battery or carbon dioxide reduction.

Description

technical field [0001] The invention relates to a drying method for preparing electrodes based on a scraping coating method Background technique [0002] Environmental pressure and energy crisis require the development of renewable energy and corresponding energy storage technology. Today, with the vigorous development of renewable energy, energy storage technology has ushered in new opportunities and challenges. At this stage, a large number of energy storage methods have changed people's way of life, providing convenient and clean life for human life. However, the lithium-ion batteries currently in production cannot fully meet the requirements of the current application market, and the high-performance lithium-sulfur battery materials, lithium-ion battery materials, and sodium-ion battery materials that are in the research stage are still not mass-produced. One of the reasons is that electrode preparation is difficult to scale up. [0003] The method of scraping and coat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/13F26B5/06
CPCY02E60/10
Inventor 张华民张洪章于滢李先锋杨晓飞陈雨晴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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