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Preparation method of graphene composite conductive agent for lithium battery

A graphene composite and conductive agent technology, applied in the field of conductive agents, can solve the problems of increased preparation time and cost, electrical performance discount, high equipment resistance, and achieves the effects of low equipment requirements, low price, and no environmental pollution.

Inactive Publication Date: 2021-01-19
苏州宇豪纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many methods for preparing graphene composite conductive paste, but each has its own shortcomings. For example, in the patent CN110600742A, in the third step of the preparation process, the material needs to be washed and filtered before the next step, which increases the preparation time and cost. ; In the patent CN103779097A, the graphite used in this patent is graphite oxide, so that the prepared product is graphene oxide with oxygen-containing groups, which greatly reduces the electrical performance; High endurance and high energy consumption

Method used

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  • Preparation method of graphene composite conductive agent for lithium battery
  • Preparation method of graphene composite conductive agent for lithium battery
  • Preparation method of graphene composite conductive agent for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh 5 g of expanded graphite and add it to the beaker, and weigh another 2 g of sodium carboxymethylcellulose (CMC) into the beaker, add 143 g of pure water to prepare the expanded graphite solution, and stir for 180 min under heating at 50 °C , and then use a high-speed shear dispersion device to shear and disperse the expanded graphite solution for 24 hours at a speed of 26000 rpm to prepare a graphene solution. The solution is first processed by low-speed centrifugation at 2000rpm to remove large unexfoliated graphite particles, and the purified solution is stored for later use. The purified graphene solution can also be precipitated and concentrated by centrifugation at 4000rpm according to experimental needs. According to the ratio of graphene and binder, the dilute graphene solution separated by concentration can be appropriately added for dilution to achieve a suitable ratio.

[0027] Take by weighing the graphene solution that makes is appropriate, ...

Embodiment 2

[0029] Accurately weigh 10g of expanded graphite and add it to the beaker, then weigh 4 g of SBR and put it into the beaker, add 286 g of water to configure the expanded graphite solution, stir for 150 min under the condition of heating at 60°C, and then use the high-speed shear dispersion equipment at 25000rpm The rotating speed shears and disperses the expanded graphite solution for 26 hours to prepare a graphene solution slurry. The solution is first processed by low-speed centrifugation at 2000rpm to remove large unexfoliated graphite particles, and the purified solution is stored for later use. The purified graphene solution can also be precipitated and concentrated by centrifugation at 4000rpm according to experimental needs. According to the ratio of graphene and binder, the dilute graphene solution separated by concentration can be appropriately added for dilution to achieve a suitable ratio.

[0030] Weigh an appropriate amount of the prepared graphene solution slurry...

Embodiment 3

[0032] Accurately weigh 12g of graphite flakes and add them to the beaker, then weigh 6 g of CMC and put them into the beaker, add 336 g of pure water to prepare the graphite flake solution, stir for 100 min under the condition of heating at 60°C, and then use high-speed shear dispersion equipment at 28000rpm The rotation speed shears and disperses the graphite flake solution for 22 hours to prepare a graphene solution slurry. The solution is first processed by low-speed centrifugation at 2000rpm to remove large unexfoliated graphite particles, and the purified solution is stored for later use. The purified graphene solution can also be precipitated and concentrated by centrifugation at 4000rpm according to experimental needs. According to the ratio of graphene and binder, the dilute graphene solution separated by concentration can be appropriately added for dilution to achieve a suitable ratio.

[0033] Weigh an appropriate amount of the obtained graphene solution slurry, add...

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Abstract

The invention relates to a preparation method of a graphene composite conductive agent for a lithium battery, which comprises the following steps: (1) by using graphite or expanded graphite as a raw material, adding a polymeric dispersant, and stirring to obtain a graphite solution; (2) preparing graphene slurry from the graphite solution in the step (1) by a mechanical stripping method; (3) basedon the graphene slurry prepared in the step (2), adding other conductive substances, and stirring to prepare the graphene composite conductive agent. The method has low requirements on equipment; themethod is simple to operate, the polymer dispersant added in the graphene preparation process is not only used for graphite dispersion, but also used as a binder in the subsequent slurry mixing process, the concentration of the obtained graphene slurry can be adjusted to a proper range by dilution or addition of a binder, and then the graphene slurry is mixed with other active substances to formthe electrode slurry. The defect of re-purification in the graphene preparation process is avoided; meanwhile, raw materials are low in cost, the used solvent is pure water or NMP, and therefore the method is environment-friendly and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of conductive agents, in particular to a preparation method of a graphene composite conductive agent for lithium batteries. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial composed of carbon atoms in a hexagonal honeycomb lattice with sp² hybrid orbitals. It has excellent optical, electrical, and mechanical properties. It is widely used in materials science, micro-nano processing, energy, and biomedicine. It has important application prospects in drug delivery and other aspects, and is considered to be a revolutionary material in the future; in terms of electrical properties, each carbon atom of graphene is hybridized with sp², and contributes the remaining one p orbital electron to form a large π Bonds, so that electrons can move freely, endow graphene with excellent conductivity, and electrons are not easily scattered when transported in graphene, and the mobility can reach ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/625H01M4/621H01M10/052Y02E60/10
Inventor 李敏陈得强包志豪
Owner 苏州宇豪纳米材料有限公司