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Lithium ion battery silicon-based negative electrode adhesive and preparation method of negative electrode piece with same

A lithium-ion battery, silicon-based negative electrode technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of disengagement, cycle performance degradation, damage to the integrity of the conductive system, etc., to improve energy density and Coulomb efficiency. Improved, mass-produced effects

Active Publication Date: 2018-04-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since SBR itself is a nanoparticle with a particle size between 50-300nm, it is easy to lose contact with the system during the repeated expansion and contraction of silicon, destroying the integrity of the entire conductive system, resulting in a significant drop in the cycle performance of silicon.

Method used

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  • Lithium ion battery silicon-based negative electrode adhesive and preparation method of negative electrode piece with same
  • Lithium ion battery silicon-based negative electrode adhesive and preparation method of negative electrode piece with same

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Ultrasonically disperse graphite oxide in water to obtain an aqueous dispersion of graphene oxide with a concentration of 1.5g / L, add a modified SBR binder, and the mass ratio of GO to modified SBR binder is 1:10. After stirring, you can get Lithium-ion battery silicon-based negative electrode binder (GO / modified SBR binder).

[0028] Weigh 95 parts of SiO / graphite and 1 part of Sp conductive agent, grind in a mortar for 20min to obtain a uniformly dispersed solid mixture, add 0.5 part of CMC powder to water, stir at a speed of 1000rpm to obtain 1.5wt% Disperse the CMC solution evenly, add the CMC solution to the ground solid mixture, stir at a speed of 2000rpm for 15min, add 3.5 parts of GO / modified SBR binder after defoaming, and continue stirring at a speed of 1000rpm for 8min, After defoaming, obtain the silicon-based negative electrode slurry that is evenly mixed; with 60g / cm 2 The areal density is coated on the copper foil, and dried in a vacuum oven at 85°C to o...

Embodiment 2

[0030] Ultrasonically disperse graphite oxide in water to obtain an aqueous dispersion of graphene oxide with a concentration of 0.5g / L, add modified SBR binder, the mass ratio of GO to modified SBR binder is 1:10, and obtain Lithium-ion battery silicon-based negative electrode binder (GO / modified SBR binder).

[0031] Weigh 81 parts of SiO / graphite and 10 parts of Sp conductive agent, and grind them in a mortar for 30 minutes to obtain a uniformly dispersed solid mixture. Add 3 parts of CMC powder into water, and stir at a speed of 1000 rpm to obtain a 1.5 wt % uniformly dispersed CMC solution. Add the CMC solution to the ground solid mixture, stir at a speed of 2000rpm for 15min, add 6 parts of GO / modified SBR binder after defoaming, continue to stir at a speed of 1000rpm for 8min, and obtain a mixed mixture after defoaming. and silicon-based negative electrode slurry; at 60g / cm 2 The areal density is coated on the copper foil, and dried in a vacuum oven at 85°C to obtain ...

Embodiment 3

[0033] Ultrasonically disperse graphite oxide in water to obtain an aqueous dispersion of graphene oxide with a concentration of 2.5g / L, add a modified SBR binder, the mass ratio of GO to modified SBR binder is 1:50, and obtain Lithium-ion battery silicon-based negative electrode binder.

[0034] Weigh 91.5 parts of SiO / graphite and 5 parts of conductive carbon nanotubes, and grind them in a mortar for 10 minutes to obtain a uniformly dispersed solid mixture. Add 2 parts of lithium carboxymethyl cellulose powder into water, and stir at a speed of 2000 rpm to obtain a 1 wt % lithium carboxymethyl cellulose solution uniformly dispersed. Add carboxymethylcellulose lithium solution to the ground solid mixture, stir at 1000rpm for 20min, add 1.5 parts of GO / modified SBR binder after defoaming, continue stirring at 1000rpm for 5min, eliminate Obtain the silicon-based negative electrode slurry that mixes evenly with after soaking; With 30g / cm 2 The areal density is coated on the co...

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Abstract

The invention discloses a lithium ion battery silicon-based negative electrode adhesive and a preparation method of the negative electrode piece with the same. The adhesive is prepared according to the method including steps: ultrasonically dispersing graphite oxide into water to obtain graphite oxide (GO) aqueous dispersion in concentration of 0.5-5mg / mL, adding a modified SBR adhesive, and stirring to obtain the lithium ion battery silicon-based negative electrode adhesive (GO / modified SBR), wherein a mass ratio of GO to modified SBR adhesive is 1:10-1:50. By the adhesive, the cycle performance of silicon-based negative electrodes can be improved, and first-time coulomb efficiency of the silicon-based negative electrode materials is improved to a certain extent. Consumption of the conducting agent in a silicon-based negative electrode system is reduced, integral energy density of lithium ion batteries can be improved beneficially, and the method is simple in process and suitable forlarge-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery binders, in particular to a silicon-based negative electrode binder for lithium-ion batteries and a method for preparing a negative electrode sheet containing the binder. Background technique [0002] In recent years, in order to develop rechargeable lithium-ion batteries with high energy density, a lot of work has focused on silicon-based anode materials because of the ultra-high theoretical capacity of silicon (4200mAh / g), but due to the accompanying The large volume effect leads to the pulverization of silicon particles, the loss of electrical contact with the conductive agent, and the destruction of the entire electrode structure, resulting in capacity attenuation and poor cycle performance. A very important way to solve these problems is to find a suitable binder. The common ones are PAA, CMC / SBR, sodium alginate, chitosan, PI, PAI, etc. Among them, the SBR type binder is due to i...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M4/139H01M10/0525
CPCH01M4/0404H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 谢李昭王辉谢李生
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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