Preparation method of novel integrated carbon fluoride positive electrode

A carbon fluoride and positive electrode technology, which is applied in the field of preparation of a new type of integrated carbon fluoride positive electrode, can solve problems such as limiting the energy density of lithium fluoride carbon batteries, increasing the proportion of inactive materials, and affecting the conductivity of carbon fluoride. Achieve the effects of improving electrode conductivity and electrolyte wettability, improving conductivity, and shortening the migration path of lithium ions

Active Publication Date: 2021-11-02
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the use of an inert binder in the preparation process of the electrode, the proportion of inactive materials in the electrode is increased, which greatly limits the energy density of lithium fluoride batteries.
At the same time, the dispersion of the conductive agent, the contact effect of the carbon fluoride active material with the conductive agent, and the current collector also affect the conductivity of the carbon fluoride positive electrode, thereby affecting the battery rate performance

Method used

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  • Preparation method of novel integrated carbon fluoride positive electrode
  • Preparation method of novel integrated carbon fluoride positive electrode

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: A kind of preparation method of novel integrated carbon fluoride positive electrode, such as figure 1 As shown, it specifically includes the following steps:

[0029] S1. Dispersion: Sieve multi-walled carbon nanotubes and multilayer graphene with 4 to 5 layers, and place them in 200ml (volume ratio 2:1) of ethanol+N,N-di Methylformamide (DMF) was dispersed in a beaker mixed with a dispersing solvent by a cell breaker with a dispersing power of 1500W and a dispersing time of 5min to form a graphene / carbon nanotube suspension with a concentration of 10mg / ml.

[0030] S2. Suction filtration: transfer the graphene / carbon nanotube suspension prepared in S1 to a filter equipped with a microporous membrane for vacuum filtration, wherein the diameter of the pores of the microporous membrane is 10 μm, and then filter the loaded The microporous filter membrane of the product is transferred to a vacuum oven for drying treatment, and the microporous filter membrane ...

Embodiment 2

[0032] Embodiment 2: A preparation method of a novel integrated carbon fluoride positive electrode, specifically comprising the following steps:

[0033] S1. Dispersion: sieve multi-walled carbon nanotubes and multilayer graphene, and place them in 500ml (volume ratio: 2:1) of methanol+N,N-dimethylformamide ( DMF) in a beaker with a mixed dispersion solvent, disperse by a cell wall breaker, the dispersion power is 500W, and the dispersion time is 30min to form a graphene / carbon nanotube suspension with a concentration of 1mg / ml.

[0034] S2. Suction filtration: transfer the graphene / carbon nanotube suspension prepared in S1 to a filter equipped with a microporous membrane for vacuum filtration, wherein the microporous membrane has a pore diameter of 5 μm, and then load the filter The microporous filter membrane of the product is transferred to a vacuum oven for drying treatment, and the microporous filter membrane is peeled off after drying to obtain a graphene / carbon nanotube...

Embodiment 3

[0036] Embodiment 3: A method for preparing a novel integrated carbon fluoride positive electrode, specifically comprising the following steps:

[0037] S1. Dispersion: Sieve multi-walled carbon nanotubes and multi-layer graphene, and place them in 300ml of N-methylpyrrolidinone+N,N-dimethyl with a volume ratio of 4:1 at a mass ratio of 1:1 Dimethylformamide (DMF) was mixed with a dispersing solvent in a beaker, and dispersed by a cell breaker with a dispersing power of 1000W and a dispersing time of 20min to form a graphene / carbon nanotube suspension with a concentration of 5mg / ml.

[0038] S2. Suction filtration: transfer the graphene / carbon nanotube suspension prepared in S1 to a filter equipped with a microporous membrane for vacuum filtration, wherein the microporous membrane has a pore diameter of 8 μm, and then load the filter The microporous filter membrane of the product is transferred to a vacuum oven for drying treatment, and the microporous filter membrane is peeled ...

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Abstract

The invention discloses a preparation method of a novel integrated carbon fluoride positive electrode in the technical field of preparation of battery electrodes. The preparation method comprises the following steps: dispersing a carbon nanotube and a graphene sieve in an ethanol solution to obtain a graphene / carbon nanotube suspension; carrying out vacuum filtration on the graphene / carbon nanotube suspension through a microporous filter membrane, then carrying out drying treatment, and uncovering the filter membrane after drying to obtain a graphene / carbon nanotube current collector; and carrying out fluoridation reaction on the graphene / carbon nanotube current collector and mixed reaction gas composed of a gas fluorine source and diluent gas at 600 to 800 DEG C to obtain the novel integrated carbon fluoride positive electrode. The three-dimensional graphene / carbon nanotube current collector is subjected to high-temperature fluorination to form the novel integrated carbon fluoride positive electrode compatible with the fluorinated graphene, the fluorinated carbon nanotube, the graphene and the carbon nanotube, so that the conductivity of the carbon fluoride material can be integrally improved, the specific energy is improved, the power output capability is improved, and the rate capability and the energy density of the carbon fluoride composite material are comprehensively improved.

Description

technical field [0001] The invention relates to the technical field of preparation of battery electrodes, in particular to a preparation method of a novel integrated carbon fluoride positive electrode. Background technique [0002] In Li-carbon fluoride (Li-CFx) batteries, the performance of the carbon fluoride (CFx) cathode is a key factor determining the performance of Li-carbon fluoride batteries. The performance of the carbon fluoride cathode is closely related to the carbon fluoride material, the composition of the electrode components and the preparation process. [0003] In order to improve the overall performance of carbon fluoride cathodes, from the perspective of carbon fluoride materials, new carbon materials, such as carbon nanotubes, carbon nanofibers, mesoporous carbon materials, fullerenes, graphene, etc., are used as precursors for fluorination. These nano-CFx materials usually have a larger specific surface area and smaller particle size, thereby improving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/08H01M4/66H01M4/06H01M4/583H01M6/14
CPCH01M4/08H01M4/06H01M4/5835H01M4/665H01M4/663H01M6/14H01M2004/028
Inventor 王畅王庆杰付薇婷陈晓涛刘富亮石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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