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Fluorinated graphene electrode active material and preparation method and application thereof

An electrode active material, a technology of fluorinated graphene, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problem of poor multiplier performance of fluorinated graphene lithium batteries, which does not meet the development orientation of green energy, and the peeling off of fluorinated graphite Poor effect and other problems, to achieve the effect of accelerating the transmission speed, promoting the kinetic process of the electrode, and facilitating the conduction of electrons

Pending Publication Date: 2021-12-31
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional organic solvents are too polar and usually interact with F atoms, causing F atoms to fall off, reducing energy density, and organic solvents are harmful to health and pollute the environment; while the peeling power provided by ultrasonic and solvothermal methods is not strong enough , the exfoliation effect of graphite fluoride with too thick sheets is extremely poor, and the yield is low
[0005] In the prior art, strong acids and strong oxidants are used in the production process of fluorinated graphene lithium batteries, which increases the danger in the production process, and the waste liquid produced not only pollutes the environment but also increases the subsequent treatment costs, which is not in line with China's green energy development Oriented, and the rate performance of the produced graphene fluoride lithium battery is poor

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  • Fluorinated graphene electrode active material and preparation method and application thereof
  • Fluorinated graphene electrode active material and preparation method and application thereof
  • Fluorinated graphene electrode active material and preparation method and application thereof

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preparation example Construction

[0036] The preparation method of the fluorinated graphene electrode active material provided by the invention comprises the following steps:

[0037] Step S1, preparing graphite fluoride dispersion:

[0038] Weigh the fluorinated graphite raw material, add it to the cationic surfactant aqueous solution, and mix evenly to obtain the fluorinated graphite dispersion, the mass ratio of the fluorinated graphite to the cationic surfactant is 1.2-1.6;

[0039] Step S2, preparing graphene fluoride solution:

[0040] The fluorinated graphite dispersion and zirconia balls obtained in step S1 are sand-milled, and then left to stand for 12-24 hours to obtain a fluorinated graphene solution;

[0041] Step S3, preparing electrode active material:

[0042] Add ethanol to the fluorinated graphene solution obtained in step S2, mix evenly, centrifuge, discard the supernatant, repeat the above operation 4-8 times, then use deionized water to filter, wash and freeze-dry to obtain fluorinated grap...

Embodiment 1

[0058] Disperse 9 g of cetyltrimethylammonium bromide (CTAB) into 1.5 L of deionized water and stir for 1 h. Dissolve and disperse 15g of raw material fluorinated graphite (F / C=0.9) in 1.5L of cationic surfactant solution, stir for 4.5h to disperse the fluorinated graphite evenly, and the cationic surfactant is evenly inserted between the layers of the fluorinated graphite, then add In a ball mill, shear and peel continuously for 2 hours to obtain a fluorinated graphene solution with reduced size and thinner thickness. Measure 1000mL of graphene fluoride aqueous solution, add 500mL of ethanol, and disperse the same mass into a centrifuge tube, centrifuge at 8000rpm for 10min, add the same amount of water and ethanol, and repeat the operation 8 times to remove a large amount of CTAB. Finally, pour it into a vacuum filter bottle, add a large amount of deionized water to wash it, and obtain the fluorinated graphene, put it into a freeze dryer and freeze-dry it for 12 hours, and o...

Embodiment 2

[0060] Disperse 12 g of cetyltrimethylammonium bromide (CTAB) into 1.5 L of deionized water and stir for 1 h. Dissolve and disperse 15g of raw material fluorinated graphite (F / C=0.9) in 1.5L of cationic surfactant solution, stir for 6h to disperse the fluorinated graphite evenly, the cationic surfactant is evenly inserted between the fluorinated graphite layers, and then add it to the ball mill During continuous shearing and peeling for 4 hours, a fluorinated graphene solution with reduced size and thinner thickness was obtained. Measure 1000mL fluorinated graphene aqueous solution, add 500mL ethanol, and disperse the same mass into a centrifuge tube, centrifuge at 10000rpm for 10min, add the same amount of water and ethanol, and repeat the operation 12 times to remove a large amount of CTAB. Finally, pour it into a vacuum filter bottle, add a large amount of deionized water to wash it, and obtain the fluorinated graphene, put it into a freeze dryer and freeze-dry it for 12 ho...

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Abstract

The invention provides a fluorinated graphene electrode active material and a preparation method and application thereof. The fluorinated graphene electrode active material disclosed by the invention has the characteristics of small size, thin sheet layer, large specific surface area and the like, is beneficial to electron transfer and ion transmission in a discharge process, and can effectively reduce polarization and improve a discharge voltage platform and rate capability. According to the principle of the preparation method, stripping energy provided by the preparation method is larger than that provided by traditional ultrasonic stripping under the actions of electrostatic interaction, steric hindrance, interface friction and the like among the cationic surface active agent, the carbon monofluoride and the zirconium oxide balls, so that the transverse size of the carbon monofluoride is effectively improved; and the stripped graphite fluoride sheet layer and the thickness range are wider, the yield is higher, and the effect is better. The method provided by the invention is simple in preparation process, free of strong acid and strong oxidant, green, environment-friendly, high in controllability and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of manufacturing lithium ion battery devices, in particular to a fluorinated graphene electrode active material and a preparation method and application thereof. Background technique [0002] Lithium / carbon fluoride battery (Li / CFx) has the highest energy density (2180Wh / kg) among known solid-state lithium primary batteries. Compared with other lithium primary batteries, lithium fluoride carbon batteries also have a high and wide discharge voltage platform (2.5-2.7V), high specific capacity and specific energy, wide operating temperature range (-40 ° C ~ 170 ° C), self-discharge Low efficiency, long storage life, environmental protection and pollution-free, high safety factor during use, so it is used in electronic equipment such as cardiac pacemakers, electronic devices, chip readers, clocks, calculators, automotive high-definition cameras, small gifts, and individual soldier systems It has a wide range of applicati...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/5835H01M10/0525H01M2004/028Y02E60/10
Inventor 拜永孝朱振兴
Owner LANZHOU UNIVERSITY
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