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Sodium ion battery negative electrode slurry, preparation method thereof, and negative electrode plate

A technology of sodium ion battery and negative electrode slurry, applied in electrode manufacturing, battery electrode, secondary battery, etc., can solve the problems of battery short circuit, bulging, poor flexibility of the pole piece, etc.

Inactive Publication Date: 2017-09-15
中国电子新能源(武汉)研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slurry and pole piece prepared by it have the following problems in the coating and sheet-making process: due to the use of deionized water as a solvent, the moisture content in the slurry is high, causing the pole piece to be prone to cracking and cracking after coating and drying. Bulging phenomenon, poor flexibility of the prepared pole piece, poor processing performance of the pole piece, prone to powder drop in the process of slicing or coiling, resulting in micro-short circuit inside the battery, posing a safety hazard

Method used

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  • Sodium ion battery negative electrode slurry, preparation method thereof, and negative electrode plate
  • Sodium ion battery negative electrode slurry, preparation method thereof, and negative electrode plate
  • Sodium ion battery negative electrode slurry, preparation method thereof, and negative electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of negative electrode

[0024] Add 100 parts by weight of solvent deionized water and 3 parts by weight of water-based binder polyacrylonitrile to the stirrer, and stir for 1 hour at 30 revolutions per minute and 3000 revolutions per minute at autorotation; then add 4 parts by weight of conductive agent acetylene black Stir for 2 hours, then add 0.5 parts by weight of plasticizer ethylene carbonate (EC) and stir for 2 hours; finally add 100 parts by weight of negative electrode active material hard carbon and stir for 2 hours, through defoaming, cross a 200 mesh sieve to make the Necessary sodium ion battery negative electrode slurry.

[0025] The negative electrode slurry of the sodium ion battery obtained above was evenly coated on a 20 micron thick aluminum foil by drawing, dried, pressed into sheets, and cut into negative electrode sheets of 45×29 mm, numbered a1.

[0026] (2) Preparation of positive electrode

[0027] 100 parts by weight of the po...

Embodiment 2

[0031] Add 80 parts by weight of solvent deionized water and 3 parts by weight of water-based binder polyacrylic acid to the stirrer, stir for 2 hours at 45 revolutions per minute and 2500 revolutions per minute at rotation; add 4 parts by weight of conductive graphite and stir for 3 hours , then add 0.5 parts by weight of plasticizer ethyl methyl carbonate (EMC) and stir for 1 hour; finally add 100 parts by weight of negative electrode active material hard carbon and stir for 3 hours, through defoaming, cross 150 mesh sieves, and make the required Sodium ion battery negative electrode slurry.

[0032] The negative electrode slurry of the sodium ion battery obtained above was uniformly coated on a 12 micron thick aluminum foil by drawing, dried, pressed into sheets, and cut into negative electrode sheets of 45×29 mm, numbered a2.

[0033] The same method and steps as in Example 1 were used to prepare the positive electrode and the battery to obtain battery A2.

Embodiment 3

[0035] Add 60 parts by weight of solvent deionized water, 3 parts by weight of water-based binder polyacrylic acid to the stirrer, stir for 2 hours with 30 revolutions per minute of revolution and 3500 revolutions per minute of rotation; then add 3 parts by weight of conductive agent carbon nanotube Stir for 2 hours, then add 1 weight part of plasticizer methyl acetate (MA) and stir for 1 hour; finally add 100 weight parts of negative electrode active material hard carbon and stir for 3 hours, through defoaming, cross a 100 mesh sieve to make the Necessary sodium ion battery negative electrode slurry.

[0036] The negative electrode slurry of the sodium ion battery obtained above was evenly coated on a 12 micron thick aluminum foil by drawing, dried, pressed into sheets, and cut into negative electrode sheets of 45×29 mm, numbered a3.

[0037] The same method and steps as in Example 1 were used to prepare the positive electrode and the battery to obtain battery A3.

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Abstract

The invention provides a sodium ion battery negative electrode slurry. The slurry comprises a negative electrode active substance, a conductive agent, a binder, a plasticizer and a solvent. Plasticizer molecules are inserted among polymer molecular chains in order to weaken the stress among the polymer molecular chains, reduce the crystallization degree of the polymer molecular chains and increase the plasticity of a polymer. The plasticizer is added to improve the dry brittleness and bulky edge problems of a coating, increase the flexibility of an electrode plate, avoid the powder dropping of the electrode plate and obviously enhance the processing performance of the electrode plate. The invention also provides a preparation method of the sodium ion battery negative electrode slurry, used for preparing the negative electrode slurry. The invention further provides a sodium ion battery negative electrode plate.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a sodium ion battery negative electrode slurry, a preparation method and a negative electrode sheet. Background technique [0002] Sodium is relatively abundant in the earth's crust, widely distributed, low cost, safe and non-toxic. Both sodium and lithium belong to alkali metal elements. Sodium atoms and lithium atoms have very similar physical and chemical properties and similar detachment / intercalation mechanisms. Compared with other energy storage technologies, sodium-ion batteries have certain advantages in resource reserves, cost, energy conversion efficiency, cycle life, safety and stability, maintenance costs and many other aspects. Therefore, the large-scale development of sodium-ion batteries has very important strategic significance. [0003] At present, deionized water is used as a solvent for sodium-ion negative electrodes, and water-based binders are used at the...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M10/054
CPCH01M4/04H01M4/62H01M10/054Y02E60/10
Inventor 周权马娟任少华孟庆飞邱珅
Owner 中国电子新能源(武汉)研究院有限责任公司
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