Preparation process of conductive agent of lithium ion battery based on modified graphene

A lithium-ion battery and preparation technology, which is applied in the field of preparation of conductive agent for lithium-ion batteries based on modified graphene, can solve problems such as poor conductivity and poor dispersion effect, and achieve improved conductivity, stable performance, and improved conductivity The effect of conduction

Active Publication Date: 2019-04-23
深圳添科材料科技有限公司
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  • Claims
  • Application Information

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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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  • Preparation process of conductive agent of lithium ion battery based on modified graphene

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Embodiment 1

[0026] A kind of lithium-ion battery conductive agent preparation process based on modified graphene of the present embodiment comprises the following steps:

[0027] In step 1, 55 parts of graphene are first activated, then mixed with aluminum-based rare earth liquid according to the weight ratio of 1:1.2 and sent into the high-pressure reactor, and adopt 60 co r Radiation source irradiation treatment, the total radiation dose is 4.0Gy, and the irradiation time is 40min. After the reaction is completed, it is washed twice with deionization, and then the surface is modified, and then it is ready for use;

[0028] Step 2: ultrasonically disperse the spare graphene and 30 parts of ethanol in step 1 for 10 minutes, then add 15 parts of carbon black and 3 parts of functionalized cellulose nanospheres, continue to ultrasonically disperse for 20 minutes, finally add 5 parts of polyaniline, and then Send the mixed solution into a high-speed disperser and stir for 1 hour at a stirrin...

Embodiment 2

[0040] A kind of lithium-ion battery conductive agent preparation process based on modified graphene of the present embodiment comprises the following steps:

[0041] In step 1, 65 parts of graphene are first activated, and then mixed with aluminum-based rare earth liquid according to the weight ratio of 1:1.8 and sent into the high-pressure reactor, and used 60 co r Radiation source irradiation treatment, the total radiation dose is 5.0Gy, and the irradiation time is 50min. After the reaction is completed, it is washed with deionization for 3 times, and then the surface is modified, and then it is ready for use;

[0042] Step 2: ultrasonically disperse the spare graphene and 40 parts of ethanol in step 1 for 20 minutes, then add 25 parts of carbon black and 6 parts of functionalized cellulose nanospheres, continue to ultrasonically disperse for 30 minutes, and finally add 10 parts of polyaniline, and then Send the mixed solution into a high-speed disperser and stir for 2 hou...

Embodiment 3

[0054] A kind of lithium-ion battery conductive agent preparation process based on modified graphene of the present embodiment comprises the following steps:

[0055] In step 1, 60 parts of graphene are activated first, then mixed with aluminum-based rare earth liquid according to the weight ratio of 1:1.5 and sent into the high-pressure reactor, and adopt 60 co r Radiation source irradiation treatment, the total radiation dose is 4.5Gy, and the irradiation time is 45min. After the reaction is completed, it is washed with deionization for 3 times, and then the surface is modified, and then it is ready for use;

[0056] Step 2: ultrasonically disperse the spare graphene and 35 parts of ethanol in step 1 for 15 minutes, then add 20 parts of carbon black and 4.5 parts of functionalized cellulose nanospheres, continue to ultrasonically disperse for 25 minutes, and finally add 7.5 parts of polyaniline, and then Send the mixture into a high-speed disperser and stir for 1.5 hours at...

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Abstract

The invention discloses a preparation process of a conductive agent of a lithium ion battery based on modified grapheme. The process comprises the following steps of: the step 1, performing activatingtreatment of the 55-60 parts of grapheme, mixing the grapheme with aluminum-based rare earth liquid according to the mass ratio of 1:(1.2-1.8) to be transmitted into a high-pressure reactor, and employing a radiation source with 60Cor to perform radiation processing, wherein the radiation total dose is 4.0-5.0Gy, and the radiation time is 40-50 min; and employing deionized water to wash the mixture after the reaction is finished and performing surface modification processing for standby application. The grapheme is activated to allow the activate to be more fully combined with the aluminum-based rare earth liquid, the aluminum-based rare earth liquid takes Al as a matrix, rare earth metal elements of SC, Y and Tm are added to form a compound, and the compound is prepared with concentratedhydrochloric acid to form rare-earth salts so as to improve the conductive conduction of grapheme, and the two are stable in performance after high-pressure radiation.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 陆志鹏
Owner 深圳添科材料科技有限公司
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