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Preparation and application of high-loading active substance electrode as well as electrode

A technology of active materials and electrode active materials, which is applied in the field of electrode materials for sodium ion batteries, can solve problems such as reducing battery performance, hindering sodium ion mass transfer, and reducing overall battery performance, so as to improve battery performance, strengthen diffusion, and promote diffusion. qualitative effect

Active Publication Date: 2018-06-08
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

Increasing the loading of active materials will inevitably cause the mass transfer of sodium ions in the electrode to be hindered, reducing the overall performance of the battery, especially the battery performance at high rates

Method used

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  • Preparation and application of high-loading active substance electrode as well as electrode
  • Preparation and application of high-loading active substance electrode as well as electrode
  • Preparation and application of high-loading active substance electrode as well as electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, the electrode active material (the cathode material is sodium vanadium phosphate), the conductive agent (Super P) and the binder (PVDF-HFP) are mixed in a mass ratio of 70%: 20%: 10%, and N-methyl is used The pyrrolidone solvent is dissolved and stirred for 5 hours to prepare a uniformly mixed and viscous slurry; then the prepared viscous slurry is evenly coated on the aluminum foil with a coating device to obtain an electrode-collector integrated electrode . The thickness of the coated electrode is 700um. The prepared electrode-collector integrated electrode is immersed in water, and the immersion time is 30 minutes, which causes the coated electrode structure to expand and produce a fluffy porous structure. The integrated electrode immersed in the solvent was quickly placed in the freezer at -20 degrees for 2 hours, and then taken out, placed in a vacuum drying oven at -55 degrees for freeze drying, and maintained for 12 hours. The freeze-dried integrated elec...

Embodiment 2

[0029] First, the electrode active material (the cathode material is sodium vanadium phosphate), the conductive agent (Super P) and the binder (PVDF-HFP) are mixed in a mass ratio of 70%: 20%: 10%, and N-methyl is used The pyrrolidone solvent is dissolved and stirred for 5 hours to prepare a uniformly mixed and viscous slurry; then the prepared viscous slurry is evenly coated on the aluminum foil with a coating device to obtain an electrode-collector integrated electrode . The thickness of the coated electrode is 1000um. The prepared electrode-current collector integrated electrode is immersed in water, and the immersion time is 30 minutes, so that the coated electrode structure is expanded and a fluffy porous structure is produced. The integrated electrode immersed in the solvent was quickly placed in the freezer at -20 degrees for 2 hours, and then taken out, placed in a vacuum drying oven at -55 degrees for freeze drying, and maintained for 12 hours. The freeze-dried integ...

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Abstract

The invention relates to preparation and an application of a high-loading active substance electrode. A method of solvent impregnating and freeze-drying is implemented, the solvent-impregnated high-loading electrode has a fluffy porous structure, and the stable fluffy porous structure is obtained through freeze-drying. The prepared high-loading electrode with the fluffy porous structure can effectively promotes diffusion and mass transfer of sodium ions in the electrode, and particularly, diffusion of sodium ions at a high rate is intensified. Through battery performance tests, the performanceof a sodium ion battery assembled by the prepared high-loading active substance electrodes is substantially improved, and the performance is notably improved at a high rate.

Description

Technical field [0001] The invention relates to the technical field of electrode materials for sodium ion batteries, in particular to a method for preparing a high-load active material electrode and its application in sodium ion batteries. technical background [0002] As we all know, lithium-ion batteries have the advantages of small size, light weight, and high energy density. They are playing an increasingly important role in portable devices such as mobile phones and notebook computers, as well as in electric bicycles and electric vehicles. The use of lithium-ion batteries is increasing year by year, especially for energy storage batteries that support the development of new energy sources. According to data from the US Geological Survey, in 2015, the world's proven lithium resources (metal lithium equivalent) were 39.5 million tons, of which almost 73% were concentrated in a few countries in South America. The world’s recoverable lithium resource reserves are about 13.5 mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/1393H01M4/134H01M4/131H01M4/136H01M4/133H01M4/1395H01M4/04H01M10/054
CPCH01M4/0404H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/054Y02E60/10
Inventor 张华民郑琼易红明刘婉秋张洪章冯凯李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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