Pole sheet preparation method for improving performance of silicon-based negative electrode lithium ion battery

A lithium-ion battery, silicon-based negative electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult wide application, cumbersome processes, etc., and achieve the effects of easy industrialization, simple process, and improved first-time efficiency

Pending Publication Date: 2022-01-18
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the traditional pole piece preparation method, the process of this scheme is cumbersome and difficult to be widely used

Method used

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  • Pole sheet preparation method for improving performance of silicon-based negative electrode lithium ion battery
  • Pole sheet preparation method for improving performance of silicon-based negative electrode lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 0.021g of trimesic acid and 0.011g of p-phenylenediamine, respectively dissolve them in 1mL of absolute ethanol + 2mL of deionized water mixture to obtain solution 1 and solution 2, according to the mass ratio of 16:2:1:1 Weigh 0.64g carbon-coated silicon anode material (~Si content: 98%), 0.08g Super-P, 0.04g CMC, 0.04g SBR, add the prepared solution 1 and solution 2, and then magnetically mix and stir to form a slurry ; then evenly coat it on the surface of copper foil, and dry it at 70°C for 40min; then put it in a vacuum oven and dry it at 120°C for 15h; Under charge and discharge cycle test. The test results are shown in Table 1, which shows that the first Coulombic efficiency and cycle performance of the modified silicon-based negative electrode sheet are better than that of the unmodified electrode sheet.

Embodiment 2

[0026] Weigh 0.021g of trimesic acid and 0.011g of hydroquinone, respectively dissolve them in 1mL of absolute ethanol + 2mL of deionized water mixture to obtain solution 1 and solution 2, and weigh them respectively according to the mass ratio of 16:2:2. Take 0.64g of carbon-coated silicon negative electrode material (~Si content: 98%), 0.08g of Super-P, 0.08g of acrylic glue, add the prepared solution 1 and solution 2, and then magnetically mix and stir to form a slurry; then mix it evenly Coated on the surface of copper foil and dried at 70°C for 40 minutes; then placed in a vacuum oven and dried at 120°C for 15 hours; finally sliced ​​into button cells, and charged and discharged at a current density of 500mA / g test. The test results are shown in Table 1, which shows that the first Coulombic efficiency and cycle performance of the modified silicon-based negative electrode sheet are better than that of the unmodified electrode sheet.

Embodiment 3

[0028] Weigh 0.021g of trimesic acid and 0.019g of p-phenylenediamine o-sulfonic acid, respectively dissolve them in 1mL of absolute ethanol + 2mL of deionized water mixture to obtain solution 1 and solution 2, in a mass ratio of 16:2: 2 Weigh 0.64g of carbon-coated silicon negative electrode material (~Si content: 98%), 0.08g of Super-P, and 0.08g of sodium alginate, add the prepared solution 1 and solution 2, and then magnetically mix and stir to form a slurry; Then it is evenly coated on the surface of copper foil, and dried at 70°C for 40min; then placed in a vacuum oven and dried at 120°C for 15h; finally sliced ​​and prepared into a button battery, at a current density of 500mA / g Carry out a charge-discharge cycle test. The test results are shown in Table 1, which shows that the first Coulombic efficiency and cycle performance of the modified silicon-based negative electrode sheet are better than that of the unmodified electrode sheet.

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Abstract

The invention discloses a preparation method of a pole sheet for improving the performance of a silicon-based negative electrode lithium ion battery. The method comprises the following steps: dissolving a modified additive into deionized water/absolute ethyl alcohol in a certain proportion to obtain a modified additive solution, and fully mixing a silicon-based negative electrode material, a conductive agent, a binder and the modified additive solution in a certain mass ratio to form a slurry-like substance, wherein the modified additive is a plurality of aromatic organic matters and must contain one of aromatic acid or aromatic aldehyde and one of aromatic alcohol or aromatic amine; and then uniformly coating the surface of a copper foil with the slurry-like substance, and respectively carrying out drying at 50-80 DEG C for 30-60 minutes and vacuum drying at 100-150 DEG C for 10-20 hours to obtain the silicon-based negative pole sheet. According to the invention, the poor contact property caused in the silicon particle expansion process is effectively improved, the problems of lattice volume expansion, silicon particle pulverization, repeated growth of SEI films on the surfaces of silicon particles, electrolytic solution consumption and the like after the silicon-based material is charged and discharged are solved, and the first efficiency, rate discharge and cycle performance of the prepared battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a pole piece for improving the performance of a silicon-based negative electrode lithium ion battery. [0002] technical background [0003] With the development of electric vehicles, power batteries are developing towards high energy density. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is difficult to meet market demand. The theoretical specific capacity of silicon materials is 4200mAh / g, low lithium intercalation potential (<0.5V), abundant storage in the earth's crust, and environmental friendliness, etc., which have gradually attracted widespread attention of researchers. However, the conductivity of silicon is poor and the volume expansion is as high as 300%. During the cycle, the large volume expansion causes the silicon to separate from the conductive network, and also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCH01M4/139Y02E60/10
Inventor 汤昊苏恒榕谭龙钟波熊文俊幸振孙润光
Owner NANCHANG UNIV
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