A kind of preparation technology of lithium ion battery conductive agent based on modified graphene

Abstract

The invention discloses a preparation process of a conductive agent for lithium-ion batteries based on modified graphene, comprising the following steps: Step 1, 55-65 parts of graphene is first activated, and then with aluminum-based rare earth liquid according to the weight ratio of 1: (1.2‑1.8) are mixed and sent into the autoclave, and adopt 60 co r Radiation source irradiation treatment, the total radiation dose is 4.0-5.0Gy, and the irradiation time is 40-50min. After the reaction is completed, it is washed with deionization for 2-3 times, and then the surface is modified, and then it is ready for use. In the present invention, the graphene is activated first, so that the graphene is more fully combined with the aluminum-based rare earth liquid in the subsequent process. The aluminum-based rare earth liquid uses Al as the matrix, and adds SC, Y, and Tm rare earth metal elements to form a compound. It is then formulated with concentrated hydrochloric acid to form rare earth salts, which can improve the electrical conductivity of graphene, and the performance of the two is stable after high-voltage irradiation.

Description

technical field [0001] The invention relates to the technical field of conductive agents for lithium ion batteries, in particular to a preparation process for conductive agents for lithium ion batteries based on modified graphene. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + Deintercalation from the positive electrode, through the electrolyte embedded in the negative electrode, the negative electrode is in a lithium-rich state; the opposite is true when discharging. Lithium-ion batteries have been developed on a large scale because of their advantages such as high output voltage, small size and high density, no memory effect, and long storage life. The conductive agent is to ensure that the electrode h...

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Problems solved by technology

[0005] Chinese patent literature (notification number: CN104505513B) discloses a graphene conductive agent for lithium ion batteries and a preparation method thereof. The mass parts of each component of the graphene conductive agent are: 25-30 parts of graphene, 10-15 1 part of polyethylene glycol, 5-10 parts of monoethanolamine, 100-160 parts of solvent, 1-5 parts of rare earth elements, 0.5-1 part of titanium carbide, the conductive agent is uniformly dispersed in the solvent with graphene, and the dispersion effect is still poor , followed by poor electrical conductivity

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