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A kind of graphene battery negative plate and preparation method thereof

A battery negative electrode and graphene technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of large battery current, bulge rupture, and potential safety hazards, and achieve increased stability, reduced pollution, and increased adsorption. Effect

Active Publication Date: 2021-10-08
GUANGXI UNIV OF CHINESE MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the good thermal conductivity of graphene, when the graphene negative plate is energized, the current inside the battery is relatively large, and the temperature in the battery rises faster, which accelerates the precipitation of gas on the lithium alloy positive plate, and the gas is too late The graphene negative plate is composited, so it accumulates continuously in the battery, which makes the pressure inside the battery continuously increase, and it is prone to bulging, rupture or even explosion, which poses a certain safety hazard

Method used

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  • A kind of graphene battery negative plate and preparation method thereof
  • A kind of graphene battery negative plate and preparation method thereof
  • A kind of graphene battery negative plate and preparation method thereof

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preparation example Construction

[0028] 1. Preparation of dispersant:

[0029] 1. Prepare ammonia water with a mass fraction of 38% for subsequent use;

[0030] ② Weigh the dopamine and the ammonia water in ① according to the mass ratio of 2:1, put the two in a beaker, stir with a constant temperature digital display magnetic stirrer until the dopamine is completely dissolved, seal it and put it aside for later use;

[0031] 2. Preparation of adhesive:

[0032] Take by weighing 4g of plant gum, 6g of sulfate and 10g of sulfate-reducing bacteria seed solution with a mass concentration of 10%, place the three in a beaker, stir until the three are mixed evenly with a constant temperature digital display magnetic stirrer, Store at 4°C for later use;

[0033] Wherein, the vegetable gum is preferably one or more mixtures of kale gum, guar gum, flax gum, coumar gum, stone flower gum in the present invention, and can also be other vegetable gums in addition;

[0034] 3. Preparation of filler:

[0035] ① Configure...

Embodiment 1

[0039] A preparation method for a graphene battery negative plate, comprising the following steps:

[0040] S1. Weigh 10g of graphene and 20g of a dispersant prepared from dopamine and ammonia water, place the two in a beaker and mix them thoroughly, then place the beaker in an ultrasonic mixer, and ultrasonically disperse for 3 minutes to obtain graphene Dispersions;

[0041] S2, in the graphene dispersion liquid that obtains in S1, add the binding agent that 5g is formulated by plant gum, sulfate and sulfate-reducing bacterial seed liquid, place in fermenter after mixing, seal and stir 6- 8 days, obtain stirring mixture;

[0042] S3, sequentially add 1g of copper powder and 3g of shell powder to the stirred mixture obtained in S2, and stir at 300-450r / min for 1h to obtain a modified graphene mixed solution;

[0043] S4. Place the modified graphene mixture obtained in S3 in a bedroom centrifuge for centrifugation, take the centrifuged sediment, press it into flakes, and dry...

Embodiment 2- Embodiment 6

[0045] Embodiment 2-embodiment 6 is all on the basis of the method of embodiment 1, the component of graphene battery negative plate and the quality of each component are adjusted, and the mass unit is g;

[0046] The components of the graphene battery negative plate of embodiment 1-embodiment 6 and the quality of each component are as follows:

[0047] components Graphene Dispersant glue Platinum powder Aluminum powder copper powder nickel powder shell powder Example 1 10 20 5 1 / / / 3 Example 2 11 22 6 1 0.5 / / 3.5 Example 3 12 25 7 1 0.5 0.5 / 4 Example 4 13 28 8 / 0.5 1 0.5 4.5 Example 5 14 29 9 / / 1 1.5 4.5 Example 6 15 30 10 0.5 1.5 0.7 0.3 5

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Abstract

The present invention proposes a graphene battery negative plate, which comprises the following components in parts by mass: 10-15 parts of graphene, 20-30 parts of dispersant, 5-10 parts of binder, and 1-10 parts of metal resistance powder 3 parts, 3-5 parts of filler; the present invention solves the problem that the graphene battery in the prior art is easy to bulge and rupture or even explode during use. The internal current is reduced, preventing the temperature of the graphene negative plate from continuing to rise, and slowing down the rate of gas generation in the lithium alloy positive plate, so that the gas can be recombined by the graphene negative plate as much as possible, so that the gas content in the battery will be corresponding The reduction helps lithium ions to shuttle better, speeds up the charging efficiency of the battery, and improves the safety performance of the battery during use.

Description

technical field [0001] The invention relates to a new energy battery, in particular to a graphene battery negative plate and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional crystalline material composed of a single carbon atomic layer, which has excellent electrical properties (electron mobility at room temperature can reach 2×105cm 2 / Vs) and outstanding thermal conductivity (5000W / mK), its electrical and thermal conductivity completely exceeds that of metal, and it also has the advantages of good high temperature resistance and corrosion resistance, so it is continuously used in different fields. [0003] Graphene battery is a new energy battery developed by utilizing the characteristics of rapid and large-scale shuttle movement of lithium ions between the graphene surface and electrodes, mainly including lithium alloy positive plate, graphene negative plate and connecting lithium alloy positive plate and graphene. Electrolyte for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/1393H01M4/364H01M4/587H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 赵立春杨胜祥赵艺淳
Owner GUANGXI UNIV OF CHINESE MEDICINE