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High-loading active substance electrode as well as preparation and application thereof

A technology of active materials and electrode active materials, which is applied in the field of electrode materials for sodium ion batteries, can solve the problems of reducing the overall performance of batteries, reducing battery performance, and hindering mass transfer of sodium ions, 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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  • High-loading active substance electrode as well as preparation and application thereof
  • High-loading active substance electrode as well as preparation and application thereof
  • High-loading active substance electrode as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: (with 2.5% NH4H2CO3 as pore forming agent)

[0023] The electrode active material (the positive electrode material is sodium vanadium phosphate, 0.35g), the conductive agent (Super P, 0.1g) and the binder (PVDF, 0.05g) are mixed according to the mass ratio of 70%: 20%: 10% , and dissolved with 1.3g of N-methylpyrrolidone solvent; at the same time, 0.0125g (2.5%) of pore-forming agent NH4H2CO3 was dissolved in 0.04g of N-methylpyrrolidone solvent. Mix the dissolved electrode active material, conductive agent, binder and dissolved pore-forming agent NH4H2CO3, and stir on a stirrer for 5 hours to form a uniformly mixed and black viscous slurry. Coating equipment is used to uniformly coat the slurry on the aluminum foil to obtain an electrode-collector integrated electrode. The thickness of the coated electrode is 1000um. Put the prepared electrode-collector integrated electrode into a constant temperature oven at 100°C to dry for 12 hours. Punch the dried ...

Embodiment 2

[0024] Embodiment 2: (with 5%NH4H2CO3 as pore-forming agent)

[0025]The electrode active material (the positive electrode material is sodium vanadium phosphate, 0.35g), the conductive agent (Super P, 0.1g) and the binder (PVDF, 0.05g) are mixed according to the mass ratio of 70%: 20%: 10% , and dissolved with 1.3 g of N-methylpyrrolidone solvent; at the same time, 0.025 g (5%) of pore-forming agent NH4H2CO3 was dissolved in 0.04 g of N-methylpyrrolidone solvent. Mix the dissolved electrode active material, conductive agent, binder and dissolved pore-forming agent NH4H2CO3, and stir on a stirrer for 5 hours to form a uniformly mixed and black viscous slurry. Coating equipment is used to uniformly coat the slurry on the aluminum foil to obtain an electrode-collector integrated electrode. The thickness of the coated electrode is 1000um. Put the prepared electrode-collector integrated electrode into a constant temperature oven at 100°C to dry for 12 hours. The dried integrated...

Embodiment 3

[0026] Embodiment 3: (with 2.5% polyethylene glycol as pore-forming agent)

[0027] The electrode active material (the positive electrode material is sodium vanadium phosphate, 0.35g), the conductive agent (Super P, 0.1g) and the binder (PVDF, 0.05g) are mixed according to the mass ratio of 70%: 20%: 10% , and dissolved with 1.3 g of N-methylpyrrolidone solvent; at the same time, 0.0125 g (2.5%) of pore-forming agent polyethylene glycol was dissolved in 0.04 g of N-methylpyrrolidone solvent. Mix the dissolved electrode active material, conductive agent, binder and dissolved pore-forming agent polyethylene glycol, and stir on a stirrer for 5 hours to form a uniformly mixed and black viscous slurry. Coating equipment is used to uniformly coat the slurry on the aluminum foil to obtain an electrode-collector integrated electrode. The thickness of the coated electrode is 1000um. Put the prepared electrode-collector integrated electrode into a constant temperature oven at 100°C to...

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Abstract

The invention relates to a preparation method of a high-loading active substance electrode. According to the method, a pore-forming agent is added in the preparation process of electrode slurry, the electrode slurry is applied to an aluminum foil current collector through coating equipment in a blade coating manner, an electrode-current collector integrated electrode is formed, the pore-forming agent is decomposed by the heat and volatilized in a gas form in the drying process, so that the electrode structure has a fluffy state, and a large quantity of pore structures are formed. The high-loading electrode having a fluffy porous structure and prepared with the method can effectively promote 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 performance of a sodium ion battery assembled by the high-loading active substance electrodes prepared by use of the pore-forming agent 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 high-capacity active material electrodes using a pore-forming agent and its application in sodium-ion batteries. Background technique [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 laptops, as well as vehicles such as electric bicycles and electric vehicles. The usage of lithium-ion batteries is increasing year by year, especially the demand for energy storage batteries supporting the development of new energy is strong. 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 global reserv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139H01M4/58H01M4/505H01M4/525H01M4/587H01M4/38H01M10/36
CPCH01M4/139H01M4/387H01M4/505H01M4/525H01M4/5825H01M4/587H01M4/62H01M4/622H01M4/623H01M4/625H01M10/36Y02E60/10
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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