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Application of konjac glucomannan to bonding agent

A konjac glucomannan and binder technology, which is applied to structural parts, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as capacity decay, viscosity, unattainable mechanical properties, and electrode structure powdering and falling off. , to prolong the cycle life, enhance the structural stability, and resist expansion and deformation.

Active Publication Date: 2018-06-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current viscosity and mechanical properties of these binders are still not up to the ideal goal, resulting in the electrode structure of the silicon-based negative electrode being easily pulverized and falling off after cycling, and causing rapid capacity decay.

Method used

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  • Application of konjac glucomannan to bonding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Silicon nanoparticles were left untreated. Silicon nanoparticles (0.05g), konjac glucomannan (0.025g), conductive agent (Super P, 0.025g) were dispersed in 4ml of water, and stirred for 12 hours. Coat the reconciled slurry evenly on the copper foil, and dry it under vacuum at 45°C for 24 hours. After drying, the pole piece was cut and transferred to the glove box, and the lithium piece was used as the counter electrode to assemble into a 2032 button battery. The electrolyte is 1M LiPF 6 It is PC / EC (volume ratio 1:1) solution of electrolyte, and FEC additive with a mass fraction of 5% is added. Finally, the button battery is subjected to a constant current charge and discharge test, wherein the current density is 2A / g, and the voltage window is 0.01-2V. figure 1 It shows that the battery exhibits excellent cycle performance when using konjac glucomannan as the binder and silicon nanoparticles without any treatment as the active material, and the specific capacity rem...

Embodiment 2

[0028] Silicon nanoparticles (2g) were put into hydrogen peroxide / sulfuric acid mixture (100ml, volume ratio 3:7), and stirred at 80°C for 2 hours. The stirred product was centrifuged at 10,000 rpm, and the obtained precipitate was washed with water for 10 times at 10,000 rpm. Then dried at 80 degrees Celsius to obtain hydroxyl-modified silicon nanoparticles. Hydroxyl-modified silicon nanoparticles (0.05 g), konjac glucomannan (0.025 g), and conductive agent (Super P, 0.025 g) were dispersed into 4 ml of water, and stirred for 12 hours. Coat the reconciled slurry evenly on the copper foil, and dry it under vacuum at 45°C for 24 hours. After drying, the pole piece was cut and transferred to the glove box, and the lithium piece was used as the counter electrode to assemble into a 2032 button battery. The electrolyte is 1M LiPF 6 It is PC / EC (volume ratio 1:1) solution of electrolyte, and FEC additive with a mass fraction of 5% is added. Finally, the button battery is subject...

Embodiment 3

[0030] Silicon nanoparticles (0.3 g) were ultrasonically dispersed in ethanol (360 ml) for 1 hour. Concentrated ammonia water (6ml), water (30ml) and 3-aminopropyltriethoxysilane (0.3ml) were added successively, and stirred at room temperature for 1.5 hours. The stirred product was centrifuged at 10000 rpm, and the obtained precipitate was washed 6 times with ethanol at 10000 rpm. Then dried at 80 degrees Celsius to obtain amino-modified silicon nanoparticles. Amino-modified silicon nanoparticles (0.05 g), konjac glucomannan (0.025 g), conductive agent (Super P, 0.025 g) were dispersed into 4 ml of water, and stirred for 12 hours. Coat the reconciled slurry evenly on the copper foil, and dry it under vacuum at 45°C for 24 hours. After drying, the pole piece was cut and transferred to the glove box, and the lithium piece was used as the counter electrode to assemble into a 2032 button battery. The electrolyte is 1M LiPF 6 It is PC / EC (volume ratio 1:1) solution of electroly...

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Abstract

The invention discloses application of konjac glucomannan to a bonding agent. The bonding agent is used for preparing a lithium ion battery silicon-based negative electrode plate. Konjac glucomannan molecules have more hydroxyls, so that the higher bonding power is realized between the konjac glucomannan and the silicon-based materials; the better physical performance is shown; the silicon based material negative electrode expansion deformation can be powerfully resisted; the electrode structure damage is avoided; the structure stability is enhanced; the silicon-based negative electrode circulation life can be favorably prolonged. Functional groups are modified on the surface of the silicon-based material, so that the mutual action force with the bonding agent can be further enhanced; theelectrochemical performance of the silicon-based negative electrode is obviously improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to the application of konjac glucomannan as a binder. Background technique [0002] Lithium-ion batteries have become the best choice for people due to their long life, flexible design, and portability. The commercial negative electrode material graphite has a low specific capacity (372mAh / g), which cannot meet the growing demand of people. Silicon has a theoretical specific capacity of up to 4200mAh / g, and is a candidate for the anode of the next generation of high specific energy lithium-ion batteries. However, silicon suffers a huge volume change (about 400%) during charging and discharging, leading to electrode disintegration and rapid capacity fading. [0003] Designing nanostructured silicon and silicon-carbon composites is expected to improve this problem. However, due to the huge volume change inherent in silicon itself, the problem of deformation of the electrode fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCH01M4/13H01M4/139H01M4/622Y02E60/10
Inventor 胡先罗郭松涛
Owner HUAZHONG UNIV OF SCI & TECH
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